<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.itron.com/role/ActivityOfHedgingInstrumentsInAccumulatedOciDetails" xlink:href="itri-20190630.xsd#ActivityOfHedgingInstrumentsInAccumulatedOciDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CertainBalanceSheetComponents" xlink:href="itri-20190630.xsd#CertainBalanceSheetComponents" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CertainBalanceSheetComponentsAccountsReceivableAllowanceForBadDebtDetails" xlink:href="itri-20190630.xsd#CertainBalanceSheetComponentsAccountsReceivableAllowanceForBadDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CertainBalanceSheetComponentsAccountsReceivableNetDetails" xlink:href="itri-20190630.xsd#CertainBalanceSheetComponentsAccountsReceivableNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CertainBalanceSheetComponentsDepreciationExpenseDetails" xlink:href="itri-20190630.xsd#CertainBalanceSheetComponentsDepreciationExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CertainBalanceSheetComponentsInventoriesDetails" xlink:href="itri-20190630.xsd#CertainBalanceSheetComponentsInventoriesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CertainBalanceSheetComponentsNarrativeDetails" xlink:href="itri-20190630.xsd#CertainBalanceSheetComponentsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CertainBalanceSheetComponentsPropertyPlantAndEquipmentNetDetails" xlink:href="itri-20190630.xsd#CertainBalanceSheetComponentsPropertyPlantAndEquipmentNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CertainBalanceSheetComponentsSummaryOfAllowanceForDoubtfulAccountsDetails" xlink:href="itri-20190630.xsd#CertainBalanceSheetComponentsSummaryOfAllowanceForDoubtfulAccountsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CertainBalanceSheetComponentsTables" xlink:href="itri-20190630.xsd#CertainBalanceSheetComponentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CommitmentsAndContingencies" xlink:href="itri-20190630.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CommitmentsAndContingenciesAvailableLinesOfCreditOutstandingStandbyLetterOfCreditsAndBondsDetails" xlink:href="itri-20190630.xsd#CommitmentsAndContingenciesAvailableLinesOfCreditOutstandingStandbyLetterOfCreditsAndBondsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CommitmentsAndContingenciesHealthBenefitPlanCostsDetails" xlink:href="itri-20190630.xsd#CommitmentsAndContingenciesHealthBenefitPlanCostsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CommitmentsAndContingenciesIncurredButNotReportedHealthBenefitCostAccrualDetails" xlink:href="itri-20190630.xsd#CommitmentsAndContingenciesIncurredButNotReportedHealthBenefitCostAccrualDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CommitmentsAndContingenciesTables" xlink:href="itri-20190630.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CommitmentsAndContingenciesWarrantyAccountActivityDetails" xlink:href="itri-20190630.xsd#CommitmentsAndContingenciesWarrantyAccountActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CommitmentsAndContingenciesWarrantyExpenseDetails" xlink:href="itri-20190630.xsd#CommitmentsAndContingenciesWarrantyExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ComputationOfBasicAndDilutedEarningsPerShareDetails" xlink:href="itri-20190630.xsd#ComputationOfBasicAndDilutedEarningsPerShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ConsolidatedBalanceSheets" xlink:href="itri-20190630.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="itri-20190630.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="itri-20190630.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:href="itri-20190630.xsd#ConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ConsolidatedStatementsOfEquityStatement" xlink:href="itri-20190630.xsd#ConsolidatedStatementsOfEquityStatement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ConsolidatedStatementsOfOperations" xlink:href="itri-20190630.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/CreditFacilityAdditionalInformationDetails" xlink:href="itri-20190630.xsd#CreditFacilityAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/Debt" xlink:href="itri-20190630.xsd#Debt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DebtSeniorNoteAdditionalInformationDetails" xlink:href="itri-20190630.xsd#DebtSeniorNoteAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DebtTables" xlink:href="itri-20190630.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DefinedBenefitPensionPlans" xlink:href="itri-20190630.xsd#DefinedBenefitPensionPlans" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DefinedBenefitPensionPlansTables" xlink:href="itri-20190630.xsd#DefinedBenefitPensionPlansTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DepreciationAndAmortizationBySegmentDetails" xlink:href="itri-20190630.xsd#DepreciationAndAmortizationBySegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DerivativeAndNonderivativeHedgingInstrumentFairValueDisclosureDetails" xlink:href="itri-20190630.xsd#DerivativeAndNonderivativeHedgingInstrumentFairValueDisclosureDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DerivativeFinancialInstruments" xlink:href="itri-20190630.xsd#DerivativeFinancialInstruments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:href="itri-20190630.xsd#DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DerivativeFinancialInstrumentsTables" xlink:href="itri-20190630.xsd#DerivativeFinancialInstrumentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DerivativesNotDesignatedAsHedgingRelationshipsDetails" xlink:href="itri-20190630.xsd#DerivativesNotDesignatedAsHedgingRelationshipsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/DocumentAndEntityInformationDocument" xlink:href="itri-20190630.xsd#DocumentAndEntityInformationDocument" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/EarningsPerShare" xlink:href="itri-20190630.xsd#EarningsPerShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/EarningsPerShareStockBasedAwardsDetails" xlink:href="itri-20190630.xsd#EarningsPerShareStockBasedAwardsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/EarningsPerShareTables" xlink:href="itri-20190630.xsd#EarningsPerShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/EffectOfCashFlowDerivativesOnBalanceSheetAndIncomeStatementBeforeTaxDetails" xlink:href="itri-20190630.xsd#EffectOfCashFlowDerivativesOnBalanceSheetAndIncomeStatementBeforeTaxDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/FairValuesOfFinancialInstruments" xlink:href="itri-20190630.xsd#FairValuesOfFinancialInstruments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/FairValuesOfFinancialInstrumentsTables" xlink:href="itri-20190630.xsd#FairValuesOfFinancialInstrumentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/Goodwill" xlink:href="itri-20190630.xsd#Goodwill" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/GoodwillSilverSpringAcquisitionDetails" xlink:href="itri-20190630.xsd#GoodwillSilverSpringAcquisitionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/GoodwillTables" xlink:href="itri-20190630.xsd#GoodwillTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/IncomeTaxContingenciesDetails" xlink:href="itri-20190630.xsd#IncomeTaxContingenciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/IncomeTaxes" xlink:href="itri-20190630.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/IncomeTaxesNarrativeDetails" xlink:href="itri-20190630.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/IncomeTaxesTables" xlink:href="itri-20190630.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/InformationBySegmentDetails" xlink:href="itri-20190630.xsd#InformationBySegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/IntangibleAssetsAndLiabilities" xlink:href="itri-20190630.xsd#IntangibleAssetsAndLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/IntangibleAssetsAndLiabilitiesEstimatedFutureAnnualAmortizationExpenseDetails" xlink:href="itri-20190630.xsd#IntangibleAssetsAndLiabilitiesEstimatedFutureAnnualAmortizationExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/IntangibleAssetsAndLiabilitiesGrossCarryingAmountAndAccumulatedAmortizationDetails" xlink:href="itri-20190630.xsd#IntangibleAssetsAndLiabilitiesGrossCarryingAmountAndAccumulatedAmortizationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/IntangibleAssetsAndLiabilitiesIntangibleAssetsNarrativeDetails" xlink:href="itri-20190630.xsd#IntangibleAssetsAndLiabilitiesIntangibleAssetsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/IntangibleAssetsAndLiabilitiesTables" xlink:href="itri-20190630.xsd#IntangibleAssetsAndLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/Leases" xlink:href="itri-20190630.xsd#Leases" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/LeasesComponentsOfLeaseExpenseDetails" xlink:href="itri-20190630.xsd#LeasesComponentsOfLeaseExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/LeasesFutureObligationsUnderOperatingLeasesBeforeAsuAdoptionDetails" xlink:href="itri-20190630.xsd#LeasesFutureObligationsUnderOperatingLeasesBeforeAsuAdoptionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/LeasesNarrativeDetails" xlink:href="itri-20190630.xsd#LeasesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/LeasesRemainingMaturitiesOfOperatingLeaseLiabilitiesAfterAsuAdoptionDetails" xlink:href="itri-20190630.xsd#LeasesRemainingMaturitiesOfOperatingLeaseLiabilitiesAfterAsuAdoptionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:href="itri-20190630.xsd#LeasesSupplementalBalanceSheetInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/LeasesSupplementalCashFlowInformationDetails" xlink:href="itri-20190630.xsd#LeasesSupplementalCashFlowInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/LeasesTables" xlink:href="itri-20190630.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/OffsettingOfDerivativeAssetsDetails" xlink:href="itri-20190630.xsd#OffsettingOfDerivativeAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/OffsettingOfDerivativeLiabilitiesDetails" xlink:href="itri-20190630.xsd#OffsettingOfDerivativeLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/Restructuring" xlink:href="itri-20190630.xsd#Restructuring" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RestructuringAdditionalInformationDetails" xlink:href="itri-20190630.xsd#RestructuringAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RestructuringExpectedCosts2016ProjectsDetails" xlink:href="itri-20190630.xsd#RestructuringExpectedCosts2016ProjectsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RestructuringRelatedBalanceSheetActivityDetails" xlink:href="itri-20190630.xsd#RestructuringRelatedBalanceSheetActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RestructuringRestructuringExpectedCosts2018ProjectsDetails" xlink:href="itri-20190630.xsd#RestructuringRestructuringExpectedCosts2018ProjectsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RestructuringTables" xlink:href="itri-20190630.xsd#RestructuringTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RevenueRecognition" xlink:href="itri-20190630.xsd#RevenueRecognition" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RevenueRecognitionNarrativeDetails" xlink:href="itri-20190630.xsd#RevenueRecognitionNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RevenueRecognitionRemaingPerformanceObligationDetails" xlink:href="itri-20190630.xsd#RevenueRecognitionRemaingPerformanceObligationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RevenueRecognitionRevenueContractAssetsAndLiabilitiesRollforwardDetails" xlink:href="itri-20190630.xsd#RevenueRecognitionRevenueContractAssetsAndLiabilitiesRollforwardDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/RevenueRecognitionTables" xlink:href="itri-20190630.xsd#RevenueRecognitionTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ScheduleOfAmountsRecognizedInConsolidatedBalanceSheetsDetails" xlink:href="itri-20190630.xsd#ScheduleOfAmountsRecognizedInConsolidatedBalanceSheetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ScheduleOfDebtDetails" xlink:href="itri-20190630.xsd#ScheduleOfDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ScheduleOfFairValuesOfFinancialInstrumentsDetails" xlink:href="itri-20190630.xsd#ScheduleOfFairValuesOfFinancialInstrumentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ScheduleOfGoodwillAllocatedToReportingSegmentsDetails" xlink:href="itri-20190630.xsd#ScheduleOfGoodwillAllocatedToReportingSegmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ScheduleOfNetPeriodicPensionBenefitCostsDetails" xlink:href="itri-20190630.xsd#ScheduleOfNetPeriodicPensionBenefitCostsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SegmentInformation" xlink:href="itri-20190630.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SegmentInformationNarrativeDetails" xlink:href="itri-20190630.xsd#SegmentInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SegmentInformationRevenuesByRegionDetails" xlink:href="itri-20190630.xsd#SegmentInformationRevenuesByRegionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SegmentInformationTables" xlink:href="itri-20190630.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ShareholdersEquity" xlink:href="itri-20190630.xsd#ShareholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ShareholdersEquityAccumulatedOtherComprehensiveIncomeDetails" xlink:href="itri-20190630.xsd#ShareholdersEquityAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ShareholdersEquityOtherComprehensiveIncomeLossDetails" xlink:href="itri-20190630.xsd#ShareholdersEquityOtherComprehensiveIncomeLossDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ShareholdersEquityPreferredStockDetails" xlink:href="itri-20190630.xsd#ShareholdersEquityPreferredStockDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ShareholdersEquityStockRepurchaseAuthorizationDetails" xlink:href="itri-20190630.xsd#ShareholdersEquityStockRepurchaseAuthorizationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/ShareholdersEquityTables" xlink:href="itri-20190630.xsd#ShareholdersEquityTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensation" xlink:href="itri-20190630.xsd#StockBasedCompensation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationExpenseAndRelatedTaxBenefitDetails" xlink:href="itri-20190630.xsd#StockBasedCompensationExpenseAndRelatedTaxBenefitDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationLongTermPerformanceRestrictedStockUnitAwardMonteCarloPricingModelAssumptionsDetails" xlink:href="itri-20190630.xsd#StockBasedCompensationLongTermPerformanceRestrictedStockUnitAwardMonteCarloPricingModelAssumptionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationNarrativeDetails" xlink:href="itri-20190630.xsd#StockBasedCompensationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationPhantomStockUnitsSummaryDetails" xlink:href="itri-20190630.xsd#StockBasedCompensationPhantomStockUnitsSummaryDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationRestrictedStockUnitsSummaryDetails" xlink:href="itri-20190630.xsd#StockBasedCompensationRestrictedStockUnitsSummaryDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationTables" xlink:href="itri-20190630.xsd#StockBasedCompensationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/StockOptionBlackScholesOptionPricingModelAssumptionsDetails" xlink:href="itri-20190630.xsd#StockOptionBlackScholesOptionPricingModelAssumptionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/StockOptionSummaryDetails" xlink:href="itri-20190630.xsd#StockOptionSummaryDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SubsequentEventsTables" xlink:href="itri-20190630.xsd#SubsequentEventsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SummaryOfIntangibleAssetAccountActivityDetails" xlink:href="itri-20190630.xsd#SummaryOfIntangibleAssetAccountActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="itri-20190630.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SummaryOfSignificantAccountingPoliciesCashCashEquivalentAndRestrictedCashDetails" xlink:href="itri-20190630.xsd#SummaryOfSignificantAccountingPoliciesCashCashEquivalentAndRestrictedCashDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SummaryOfSignificantAccountingPoliciesNewAccountingPronouncementsDetails" xlink:href="itri-20190630.xsd#SummaryOfSignificantAccountingPoliciesNewAccountingPronouncementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="itri-20190630.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.itron.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="itri-20190630.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ActivityOfHedgingInstrumentsInAccumulatedOciDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_CA9A58DC180D2F5D906649A9E4E67A10" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_60ED9ADD762A8B6C47A849A9E4E5F801" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_CA9A58DC180D2F5D906649A9E4E67A10" xlink:to="loc_us-gaap_StatementTable_60ED9ADD762A8B6C47A849A9E4E5F801" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_17E3B7EAC2EEAFFC0D4849A9E4E5A783" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_60ED9ADD762A8B6C47A849A9E4E5F801" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_17E3B7EAC2EEAFFC0D4849A9E4E5A783" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_551BE796D7CF5452640849A9E4E5C211_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_17E3B7EAC2EEAFFC0D4849A9E4E5A783" xlink:to="loc_us-gaap_EquityComponentDomain_551BE796D7CF5452640849A9E4E5C211_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_551BE796D7CF5452640849A9E4E5C211" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_17E3B7EAC2EEAFFC0D4849A9E4E5A783" xlink:to="loc_us-gaap_EquityComponentDomain_551BE796D7CF5452640849A9E4E5C211" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AccumulatedNetGainLossfromDerivativeandNonderivativeInstrumentsDesignatedasHedgingInstrumentsMember" xlink:label="loc_itri_AccumulatedNetGainLossfromDerivativeandNonderivativeInstrumentsDesignatedasHedgingInstrumentsMember_4B7A3421765FF0A73D5D49A9E4E68CF3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_551BE796D7CF5452640849A9E4E5C211" xlink:to="loc_itri_AccumulatedNetGainLossfromDerivativeandNonderivativeInstrumentsDesignatedasHedgingInstrumentsMember_4B7A3421765FF0A73D5D49A9E4E68CF3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_7FA5E2660FD081B5083049A9E4E6C40B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA9A58DC180D2F5D906649A9E4E67A10" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_7FA5E2660FD081B5083049A9E4E6C40B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_81FAF9AC2EB6D9BEE54C49A9E4E76479" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA9A58DC180D2F5D906649A9E4E67A10" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_81FAF9AC2EB6D9BEE54C49A9E4E76479" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_2A95AEDEB64F95AFD63649A9E4E7D114" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_CA9A58DC180D2F5D906649A9E4E67A10" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_2A95AEDEB64F95AFD63649A9E4E7D114" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/CertainBalanceSheetComponents" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CertainBalanceSheetComponentsAccountsReceivableAllowanceForBadDebtDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CertainBalanceSheetComponentsAccountsReceivableNetDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CertainBalanceSheetComponentsDepreciationExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CertainBalanceSheetComponentsInventoriesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CertainBalanceSheetComponentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_CC4A571E40D86814F006D337AAC6C81A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1B02AE4E30F78CDBFEEFD337AAC690D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_CC4A571E40D86814F006D337AAC6C81A" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1B02AE4E30F78CDBFEEFD337AAC690D7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_49289DD37FEF08FF2994D337AAC62DB8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1B02AE4E30F78CDBFEEFD337AAC690D7" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_49289DD37FEF08FF2994D337AAC62DB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_B5924DE97068049123C6D337AAC625D2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_49289DD37FEF08FF2994D337AAC62DB8" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_B5924DE97068049123C6D337AAC625D2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_B5924DE97068049123C6D337AAC625D2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_49289DD37FEF08FF2994D337AAC62DB8" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_B5924DE97068049123C6D337AAC625D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_509E69DE4A3682EC7117D337AAC6B18E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_B5924DE97068049123C6D337AAC625D2" xlink:to="loc_us-gaap_SubsequentEventMember_509E69DE4A3682EC7117D337AAC6B18E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9DC079D8470935A29735D337AAC6763B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1B02AE4E30F78CDBFEEFD337AAC690D7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9DC079D8470935A29735D337AAC6763B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_216736FCB4BDAA3327BAD337AAC6D376_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9DC079D8470935A29735D337AAC6763B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_216736FCB4BDAA3327BAD337AAC6D376_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_216736FCB4BDAA3327BAD337AAC6D376" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_9DC079D8470935A29735D337AAC6763B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_216736FCB4BDAA3327BAD337AAC6D376" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_MassyMember" xlink:label="loc_itri_MassyMember_0DBE6C4F18488C651C2BD337AAC6817F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_216736FCB4BDAA3327BAD337AAC6D376" xlink:to="loc_itri_MassyMember_0DBE6C4F18488C651C2BD337AAC6817F" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_StretfordMember" xlink:label="loc_itri_StretfordMember_BD96A82129773BE847FCD337AAC63B65" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_216736FCB4BDAA3327BAD337AAC6D376" xlink:to="loc_itri_StretfordMember_BD96A82129773BE847FCD337AAC63B65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfProperties" xlink:label="loc_us-gaap_GainLossOnSaleOfProperties_722BAEA872B9064BDB15D337AAC60090" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_CC4A571E40D86814F006D337AAC6C81A" xlink:to="loc_us-gaap_GainLossOnSaleOfProperties_722BAEA872B9064BDB15D337AAC60090" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/CertainBalanceSheetComponentsPropertyPlantAndEquipmentNetDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CertainBalanceSheetComponentsSummaryOfAllowanceForDoubtfulAccountsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CertainBalanceSheetComponentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CommitmentsAndContingenciesAvailableLinesOfCreditOutstandingStandbyLetterOfCreditsAndBondsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_C7C7251F67BE70A4787FD337ACE664AD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_F5F76AED548F9D1F8010D337ACE629BD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_C7C7251F67BE70A4787FD337ACE664AD" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_F5F76AED548F9D1F8010D337ACE629BD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_250468A2ADAAB067FF38D337ACE68DE5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_F5F76AED548F9D1F8010D337ACE629BD" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_250468A2ADAAB067FF38D337ACE68DE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_928EA5B4429C4303F2A7D337ACE6606A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_250468A2ADAAB067FF38D337ACE68DE5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_928EA5B4429C4303F2A7D337ACE6606A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_928EA5B4429C4303F2A7D337ACE6606A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_250468A2ADAAB067FF38D337ACE68DE5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_928EA5B4429C4303F2A7D337ACE6606A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_FC14F7F01581EA83B6D2D337ACE63F6B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_928EA5B4429C4303F2A7D337ACE6606A" xlink:to="loc_us-gaap_LineOfCreditMember_FC14F7F01581EA83B6D2D337ACE63F6B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GuaranteeObligationsByNatureAxis" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_69255E74D2CDF7F83819D337ACE6F67F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_F5F76AED548F9D1F8010D337ACE629BD" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_69255E74D2CDF7F83819D337ACE6F67F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_687A8E6192C1F510EBD1D337ACE6A50F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_69255E74D2CDF7F83819D337ACE6F67F" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_687A8E6192C1F510EBD1D337ACE6A50F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_687A8E6192C1F510EBD1D337ACE6A50F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_69255E74D2CDF7F83819D337ACE6F67F" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_687A8E6192C1F510EBD1D337ACE6A50F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SuretyBondMember" xlink:label="loc_us-gaap_SuretyBondMember_DD2536DD16E05CBC0F01D337ACE6D747" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_687A8E6192C1F510EBD1D337ACE6A50F" xlink:to="loc_us-gaap_SuretyBondMember_DD2536DD16E05CBC0F01D337ACE6D747" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_4D896EFBF4CF999BA2AAD337ACE6771B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_F5F76AED548F9D1F8010D337ACE629BD" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_4D896EFBF4CF999BA2AAD337ACE6771B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_988004B246902197541ED337ACE691E3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_4D896EFBF4CF999BA2AAD337ACE6771B" xlink:to="loc_us-gaap_LossContingencyNatureDomain_988004B246902197541ED337ACE691E3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_988004B246902197541ED337ACE691E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_4D896EFBF4CF999BA2AAD337ACE6771B" xlink:to="loc_us-gaap_LossContingencyNatureDomain_988004B246902197541ED337ACE691E3" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_CreditFacilityMember" xlink:label="loc_itri_CreditFacilityMember_1B02B3DC864B1F1D0A53D337ACE6FD25" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_988004B246902197541ED337ACE691E3" xlink:to="loc_itri_CreditFacilityMember_1B02B3DC864B1F1D0A53D337ACE6FD25" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_UnsecuredMulticurrencyRevolvingLinesOfCreditMember" xlink:label="loc_itri_UnsecuredMulticurrencyRevolvingLinesOfCreditMember_376539E4A3C84C083C91D337ACE6EFB5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_988004B246902197541ED337ACE691E3" xlink:to="loc_itri_UnsecuredMulticurrencyRevolvingLinesOfCreditMember_376539E4A3C84C083C91D337ACE6EFB5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_624FDE3773E331734440D337ACE68C4D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_C7C7251F67BE70A4787FD337ACE664AD" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_624FDE3773E331734440D337ACE68C4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_5FC6ABB199F121326774D337ACE68501" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_C7C7251F67BE70A4787FD337ACE664AD" xlink:to="loc_us-gaap_LineOfCredit_5FC6ABB199F121326774D337ACE68501" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_E163B3D09A36A3416656D337ACE675AA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_C7C7251F67BE70A4787FD337ACE664AD" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_E163B3D09A36A3416656D337ACE675AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaap_ShortTermBorrowings_2B1590BBC006DDBEDBBED337ACE6A90E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_C7C7251F67BE70A4787FD337ACE664AD" xlink:to="loc_us-gaap_ShortTermBorrowings_2B1590BBC006DDBEDBBED337ACE6A90E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_160F310A2BE1D39E2DCFD337ACE652C1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_C7C7251F67BE70A4787FD337ACE664AD" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_160F310A2BE1D39E2DCFD337ACE652C1" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_LineofCreditFacilityRemainingcapacitytosupportlettersofcredit" xlink:label="loc_itri_LineofCreditFacilityRemainingcapacitytosupportlettersofcredit_301137640DFD377B02A3D337ACE63207" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_C7C7251F67BE70A4787FD337ACE664AD" xlink:to="loc_itri_LineofCreditFacilityRemainingcapacitytosupportlettersofcredit_301137640DFD377B02A3D337ACE63207" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_25592A33168C135F4F3CD337ACE6D78D" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_C7C7251F67BE70A4787FD337ACE664AD" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_25592A33168C135F4F3CD337ACE6D78D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/CommitmentsAndContingenciesHealthBenefitPlanCostsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CommitmentsAndContingenciesIncurredButNotReportedHealthBenefitCostAccrualDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CommitmentsAndContingenciesWarrantyAccountActivityDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/CommitmentsAndContingenciesWarrantyExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ComputationOfBasicAndDilutedEarningsPerShareDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ConsolidatedBalanceSheets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ConsolidatedStatementsOfEquityStatement" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_DBACB3E82F82538A42B7272B2EAE36D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StatementTable_DBACB3E82F82538A42B7272B2EAE36D7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_985F68F0C8F8E0C6A7C3272B2EAEEF12" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_DBACB3E82F82538A42B7272B2EAE36D7" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_985F68F0C8F8E0C6A7C3272B2EAEEF12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9D69E98B72BBA6E1CC70272B2EAE1E71_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_985F68F0C8F8E0C6A7C3272B2EAEEF12" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9D69E98B72BBA6E1CC70272B2EAE1E71_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9D69E98B72BBA6E1CC70272B2EAE1E71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_985F68F0C8F8E0C6A7C3272B2EAEEF12" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9D69E98B72BBA6E1CC70272B2EAE1E71" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SIlverSpringNetworksInc.Member" xlink:label="loc_itri_SIlverSpringNetworksInc.Member_B853018197832E50418B272B2EAF5765" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9D69E98B72BBA6E1CC70272B2EAE1E71" xlink:to="loc_itri_SIlverSpringNetworksInc.Member_B853018197832E50418B272B2EAF5765" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_CC3EA8475140F0513E3A272B2EAF9EE2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_DBACB3E82F82538A42B7272B2EAE36D7" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_CC3EA8475140F0513E3A272B2EAF9EE2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_CC3EA8475140F0513E3A272B2EAF9EE2" xlink:to="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_CC3EA8475140F0513E3A272B2EAF9EE2" xlink:to="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_EA762AEF1B3EB1637BA2272B2EB08BBE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8" xlink:to="loc_us-gaap_CommonStockMember_EA762AEF1B3EB1637BA2272B2EB08BBE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_4E31BA5D0AEF15C6144F272B2EB0BCC0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8" xlink:to="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_4E31BA5D0AEF15C6144F272B2EB0BCC0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_7A2F78FCE6CBF1068CAE272B2EB05944" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_7A2F78FCE6CBF1068CAE272B2EB05944" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_10C89C2EAC95B3B4961C272B2EB00FAB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8" xlink:to="loc_us-gaap_RetainedEarningsMember_10C89C2EAC95B3B4961C272B2EB00FAB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_6C4DC572BEABBACE4E60272B2EB0491B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8" xlink:to="loc_us-gaap_ParentMember_6C4DC572BEABBACE4E60272B2EB0491B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_E51849CD6BC48A5340EE272B2EB1E199" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4D02268742549D340D41272B2EAF17B8" xlink:to="loc_us-gaap_NoncontrollingInterestMember_E51849CD6BC48A5340EE272B2EB1E199" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_C14442C2F9C10572B4B9272B2EB16343" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_DBACB3E82F82538A42B7272B2EAE36D7" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_C14442C2F9C10572B4B9272B2EB16343" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_83D3F4438BA05B610D25272B2EB17077_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_C14442C2F9C10572B4B9272B2EB16343" xlink:to="loc_us-gaap_TypeOfAdoptionMember_83D3F4438BA05B610D25272B2EB17077_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_83D3F4438BA05B610D25272B2EB17077" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_C14442C2F9C10572B4B9272B2EB16343" xlink:to="loc_us-gaap_TypeOfAdoptionMember_83D3F4438BA05B610D25272B2EB17077" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingStandardsUpdate201609Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201609Member_A9E15E9218620223939B272B2EB1AB91" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_83D3F4438BA05B610D25272B2EB17077" xlink:to="loc_us-gaap_AccountingStandardsUpdate201609Member_A9E15E9218620223939B272B2EB1AB91" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_D6147A3125D0D5AED4C4272B2EB202BF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_NetIncomeLoss_D6147A3125D0D5AED4C4272B2EB202BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_DCCECC3826E5300ED5A1272B2EB2FE97" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_DCCECC3826E5300ED5A1272B2EB2FE97" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_C68F7CDCE0883101985F272B2EB25C8C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_C68F7CDCE0883101985F272B2EB25C8C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_1B4F6004F036C7ABB2C4272B2EB2F68E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_ProfitLoss_1B4F6004F036C7ABB2C4272B2EB2F68E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_58AEB4134F09193AC482272B2EB33443" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_58AEB4134F09193AC482272B2EB33443" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_AEEE02EA9EE833B49045272B2EB39276" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_AEEE02EA9EE833B49045272B2EB39276" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_922E1CC9621F2BE883A6272B2EB31851" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_922E1CC9621F2BE883A6272B2EB31851" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_27B66E9817F576F75067272B2EB3C013" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_27B66E9817F576F75067272B2EB3C013" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense_A0F0AAF198986871360D272B2EB35A18" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense_A0F0AAF198986871360D272B2EB35A18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_F35CDAD57D3072FF2710272B2EB41F23" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_F35CDAD57D3072FF2710272B2EB41F23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_51FF793335E39A869B96272B2EB40AAD" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_51FF793335E39A869B96272B2EB40AAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross_93065689FFF4A865F72C272B2EB43754" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross_93065689FFF4A865F72C272B2EB43754" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross_7C47D366EBF07C17922B272B2EB4C387" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross_7C47D366EBF07C17922B272B2EB4C387" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_C506D0204EB9548C8257272B2EB4141E" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_C506D0204EB9548C8257272B2EB4141E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_6299B0137A2382B45F62272B2EB58018" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_6299B0137A2382B45F62272B2EB58018" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_0EC18EFB93A916C2C0DD272B2EB5762F" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_0EC18EFB93A916C2C0DD272B2EB5762F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_D10919A5F15ACB35A41B272B2EB5DE7B" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_D10919A5F15ACB35A41B272B2EB5DE7B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_1D5437F3900AC8D8CE96272B2EB534B2" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_1D5437F3900AC8D8CE96272B2EB534B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_1256313796AE957245CC272B2EB50054" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_1256313796AE957245CC272B2EB50054" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_BE264D6E3CBDDFB6403A272B2EB594AB" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_BE264D6E3CBDDFB6403A272B2EB594AB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_1E63B5037F9D1F2393E1272B2EB66CC9" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D801C30220646C7A2238272B2EB2CD39" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_1E63B5037F9D1F2393E1272B2EB66CC9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_977EA5B2E92925ABF1094A0F8D1469C9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_StatementTable_977EA5B2E92925ABF1094A0F8D1469C9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_6F7C79F4A96E37F95CD24A0F8D157727" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_977EA5B2E92925ABF1094A0F8D1469C9" xlink:to="loc_srt_ProductOrServiceAxis_6F7C79F4A96E37F95CD24A0F8D157727" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_579AE3856759417901DA4A0F8D154F87_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_6F7C79F4A96E37F95CD24A0F8D157727" xlink:to="loc_srt_ProductsAndServicesDomain_579AE3856759417901DA4A0F8D154F87_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_579AE3856759417901DA4A0F8D154F87" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_6F7C79F4A96E37F95CD24A0F8D157727" xlink:to="loc_srt_ProductsAndServicesDomain_579AE3856759417901DA4A0F8D154F87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductMember" xlink:label="loc_us-gaap_ProductMember_FF2398A4CE99CE1DCD884A0F8D16A3BA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_579AE3856759417901DA4A0F8D154F87" xlink:to="loc_us-gaap_ProductMember_FF2398A4CE99CE1DCD884A0F8D16A3BA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ServiceMember" xlink:label="loc_us-gaap_ServiceMember_4C517DFFD449FB9E0C1F4A0F8D16B740" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_579AE3856759417901DA4A0F8D154F87" xlink:to="loc_us-gaap_ServiceMember_4C517DFFD449FB9E0C1F4A0F8D16B740" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_76EEE108580A7B286C274A0F8D176E33" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_RevenuesAbstract_76EEE108580A7B286C274A0F8D176E33" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_10D4034DD25376222CF64A0F8D19352B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_76EEE108580A7B286C274A0F8D176E33" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_10D4034DD25376222CF64A0F8D19352B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfRevenueAbstract" xlink:label="loc_us-gaap_CostOfRevenueAbstract_E37FD4A7C4023235D7BB4A0F8D19C901" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_CostOfRevenueAbstract_E37FD4A7C4023235D7BB4A0F8D19C901" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_142C785892D879A3C5C64A0F8D1A9B2F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_E37FD4A7C4023235D7BB4A0F8D19C901" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_142C785892D879A3C5C64A0F8D1A9B2F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_01D6EE4D5E3F0C2258B84A0F8D1A346F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_GrossProfit_01D6EE4D5E3F0C2258B84A0F8D1A346F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_53CCC630903FBC77DE514A0F8D1AAD5A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_OperatingExpensesAbstract_53CCC630903FBC77DE514A0F8D1AAD5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_EAC2547110171D5CD4BB4A0F8D1BDE8F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_53CCC630903FBC77DE514A0F8D1AAD5A" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_EAC2547110171D5CD4BB4A0F8D1BDE8F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_25C8143D21485993472A4A0F8D1BB906" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_53CCC630903FBC77DE514A0F8D1AAD5A" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_25C8143D21485993472A4A0F8D1BB906" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_0FE45F123B7812B3A3DE4A0F8D1BDAB8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_53CCC630903FBC77DE514A0F8D1AAD5A" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_0FE45F123B7812B3A3DE4A0F8D1BDAB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_430612E2384BB67FBAEC4A0F8D1B0A30" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_53CCC630903FBC77DE514A0F8D1AAD5A" xlink:to="loc_us-gaap_RestructuringCharges_430612E2384BB67FBAEC4A0F8D1B0A30" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_EA7E1ACB2F55C1AA1A3D4A0F8D1B7A4C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_53CCC630903FBC77DE514A0F8D1AAD5A" xlink:to="loc_us-gaap_OperatingExpenses_EA7E1ACB2F55C1AA1A3D4A0F8D1B7A4C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_FF6E1FF9C3228BB8DEF34A0F8D1B36CF" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_53CCC630903FBC77DE514A0F8D1AAD5A" xlink:to="loc_us-gaap_OperatingIncomeLoss_FF6E1FF9C3228BB8DEF34A0F8D1B36CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7CDA51DC50F4050C85574A0F8D1C0059" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7CDA51DC50F4050C85574A0F8D1C0059" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestIncomeOther" xlink:label="loc_us-gaap_InterestIncomeOther_A7D6EBD7462A145A05524A0F8D1CF97E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7CDA51DC50F4050C85574A0F8D1C0059" xlink:to="loc_us-gaap_InterestIncomeOther_A7D6EBD7462A145A05524A0F8D1CF97E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_50622288CA113C37FF374A0F8D1C16D0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7CDA51DC50F4050C85574A0F8D1C0059" xlink:to="loc_us-gaap_InterestExpense_50622288CA113C37FF374A0F8D1C16D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_B396A696142AD91CBAB14A0F8D1C2073" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7CDA51DC50F4050C85574A0F8D1C0059" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_B396A696142AD91CBAB14A0F8D1C2073" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_BA93C898EAC24E1B7DA14A0F8D1D723F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_7CDA51DC50F4050C85574A0F8D1C0059" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_BA93C898EAC24E1B7DA14A0F8D1D723F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EA7ECE8A5242C76A996B4A0F8D1DA324" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_EA7ECE8A5242C76A996B4A0F8D1DA324" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_15BA457F0D2629B08CD94A0F8D1D635C" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_15BA457F0D2629B08CD94A0F8D1D635C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_5D5598266B3217EC5F174A0F8D1DE6CF" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_ProfitLoss_5D5598266B3217EC5F174A0F8D1DE6CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_0B7E5A27C326E063B1984A0F8D1D1892" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_0B7E5A27C326E063B1984A0F8D1D1892" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_FB7F64340F3E2E2AED554A0F8D1DBA40" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_NetIncomeLoss_FB7F64340F3E2E2AED554A0F8D1DBA40" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_0ADF367AFCA2A2ADEF824A0F8D1E3231" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_EarningsPerShareBasic_0ADF367AFCA2A2ADEF824A0F8D1E3231" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_CE8D69061D9708BA0E6D4A0F8D1E1B78" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_EarningsPerShareDiluted_CE8D69061D9708BA0E6D4A0F8D1E1B78" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_7A3FA703EC920DC90DCF4A0F8D1ED079" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_7A3FA703EC920DC90DCF4A0F8D1ED079" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_A80CAED8F644069EFEFC4A0F8D1E548F" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EDBCD40FB0EB7A0C29154A0F8D176E27" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_A80CAED8F644069EFEFC4A0F8D1E548F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/CreditFacilityAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_81097E8830DB35CA9EBCD337AE8C6D28" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_DebtInstrumentTable_81097E8830DB35CA9EBCD337AE8C6D28" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_A107D953A18324C0185AD337AE8C3E25" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_81097E8830DB35CA9EBCD337AE8C6D28" xlink:to="loc_us-gaap_VariableRateAxis_A107D953A18324C0185AD337AE8C3E25" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_A107D953A18324C0185AD337AE8C3E25" xlink:to="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_A107D953A18324C0185AD337AE8C3E25" xlink:to="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_425A491126137330B68CD337AE8C5DB7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_425A491126137330B68CD337AE8C5DB7" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_EURIBORMember" xlink:label="loc_itri_EURIBORMember_A6E0EDA123A272B21FDBD337AE8C084F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B" xlink:to="loc_itri_EURIBORMember_A6E0EDA123A272B21FDBD337AE8C084F" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AlternateBaseRate1Member" xlink:label="loc_itri_AlternateBaseRate1Member_3D05AF883411DAA332B6D337AE8CF081" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B" xlink:to="loc_itri_AlternateBaseRate1Member_3D05AF883411DAA332B6D337AE8CF081" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AlternateBaseRate2Member" xlink:label="loc_itri_AlternateBaseRate2Member_833901A0B5981517E11DD337AE8C31A8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B" xlink:to="loc_itri_AlternateBaseRate2Member_833901A0B5981517E11DD337AE8C31A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_22A947DDA0E12EFC48DED337AE8C01C7" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_22A947DDA0E12EFC48DED337AE8C01C7" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AlternateBaseRate3Member" xlink:label="loc_itri_AlternateBaseRate3Member_8A1DFC84DA9512C5EB02D337AE8C3B15" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B" xlink:to="loc_itri_AlternateBaseRate3Member_8A1DFC84DA9512C5EB02D337AE8C3B15" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AlternateBaseRateMember" xlink:label="loc_itri_AlternateBaseRateMember_3CF838391219A94D9430D337AE8C0428" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_1D32B234C04A1F993797D337AE8C2F5B" xlink:to="loc_itri_AlternateBaseRateMember_3CF838391219A94D9430D337AE8C0428" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_C1B1D152429D7EAC1EF0D337AE8CB589" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_81097E8830DB35CA9EBCD337AE8C6D28" xlink:to="loc_srt_RangeAxis_C1B1D152429D7EAC1EF0D337AE8CB589" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_7C8F16188AD599CD34BBD337AE8CEF15_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_C1B1D152429D7EAC1EF0D337AE8CB589" xlink:to="loc_srt_RangeMember_7C8F16188AD599CD34BBD337AE8CEF15_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_7C8F16188AD599CD34BBD337AE8CEF15" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_C1B1D152429D7EAC1EF0D337AE8CB589" xlink:to="loc_srt_RangeMember_7C8F16188AD599CD34BBD337AE8CEF15" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_51F3A03120D5400C80C4D337AE8C379C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_7C8F16188AD599CD34BBD337AE8CEF15" xlink:to="loc_srt_MinimumMember_51F3A03120D5400C80C4D337AE8C379C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_D3FD221F875B5DDCA288D337AE8C50EB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_7C8F16188AD599CD34BBD337AE8CEF15" xlink:to="loc_srt_MaximumMember_D3FD221F875B5DDCA288D337AE8C50EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_4E397B19B78BA696D898D337AE8CF07B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_81097E8830DB35CA9EBCD337AE8C6D28" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_4E397B19B78BA696D898D337AE8CF07B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_C9F72CDA5F7DD6D09667D337AE8C8051_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4E397B19B78BA696D898D337AE8CF07B" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_C9F72CDA5F7DD6D09667D337AE8C8051_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_C9F72CDA5F7DD6D09667D337AE8C8051" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4E397B19B78BA696D898D337AE8CF07B" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_C9F72CDA5F7DD6D09667D337AE8C8051" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_B8A1CC36FCB0E673DD94D337AE8C65C8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_C9F72CDA5F7DD6D09667D337AE8C8051" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_B8A1CC36FCB0E673DD94D337AE8C65C8" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_UsdDenominatedTermLoanMember" xlink:label="loc_itri_UsdDenominatedTermLoanMember_140D26C52197AEAB0259D337AE8C7BE0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_C9F72CDA5F7DD6D09667D337AE8C8051" xlink:to="loc_itri_UsdDenominatedTermLoanMember_140D26C52197AEAB0259D337AE8C7BE0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_690A838DBC5A01C08B2BD337AE8C6F4C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_C9F72CDA5F7DD6D09667D337AE8C8051" xlink:to="loc_us-gaap_LineOfCreditMember_690A838DBC5A01C08B2BD337AE8C6F4C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StandbyLettersOfCreditMember" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_5E1A6E94772E72CC6045D337AE8CD364" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_C9F72CDA5F7DD6D09667D337AE8C8051" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_5E1A6E94772E72CC6045D337AE8CD364" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="loc_us-gaap_SecuredDebtMember_FF8C542F3757D00E56DBD337AE8CBE5D" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_C9F72CDA5F7DD6D09667D337AE8C8051" xlink:to="loc_us-gaap_SecuredDebtMember_FF8C542F3757D00E56DBD337AE8CBE5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_2B3D77F1203F7040D1E0D337AE8C531D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_2B3D77F1203F7040D1E0D337AE8C531D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_5EA1DE307C3A09790A3DD337AE8CE415" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_5EA1DE307C3A09790A3DD337AE8CE415" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_49F53EA11C600966CFB4D337AE8C515B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_49F53EA11C600966CFB4D337AE8C515B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentCollateral" xlink:label="loc_us-gaap_DebtInstrumentCollateral_6856475A4E49FE6F89B3D337AE8CB5F6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_DebtInstrumentCollateral_6856475A4E49FE6F89B3D337AE8CB5F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_7DEEA1FA4979D7E1AAC8D337AE8C731E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_7DEEA1FA4979D7E1AAC8D337AE8C731E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_C1365CB93D8AABC078B6D337AE8C6176" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_C1365CB93D8AABC078B6D337AE8C6176" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_2975BC99D0ECA662D68ED337AE8CE14F" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_2975BC99D0ECA662D68ED337AE8CE14F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_56BFD261F5639DAAF52BD337AE8C9AEE" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_LineOfCredit_56BFD261F5639DAAF52BD337AE8C9AEE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_3E7BE60434B3D90D4CBAD337AE8C487B" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_3E7BE60434B3D90D4CBAD337AE8C487B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_A02D0E2B8D593B66C4E1D337AE8CB3F7" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_402C7C973685703BAFCFD337AE8C5481" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_A02D0E2B8D593B66C4E1D337AE8CB3F7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/Debt" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/DebtSeniorNoteAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_38B2519A832B979949E3D337AD5F6CA4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_771AA7CF929B6199CC2DD337AD5F36B9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_38B2519A832B979949E3D337AD5F6CA4" xlink:to="loc_us-gaap_DebtInstrumentTable_771AA7CF929B6199CC2DD337AD5F36B9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_7BDFB3E2E1865E57AEDCD337AD5F8345" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_771AA7CF929B6199CC2DD337AD5F36B9" xlink:to="loc_us-gaap_StatementScenarioAxis_7BDFB3E2E1865E57AEDCD337AD5F8345" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_620D696D9F9CE1ACC895D337AD5F23B7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_7BDFB3E2E1865E57AEDCD337AD5F8345" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_620D696D9F9CE1ACC895D337AD5F23B7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_620D696D9F9CE1ACC895D337AD5F23B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_7BDFB3E2E1865E57AEDCD337AD5F8345" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_620D696D9F9CE1ACC895D337AD5F23B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="loc_us-gaap_ScenarioForecastMember_FFA722A21255E3DCDAFCD337AD5FE3D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_620D696D9F9CE1ACC895D337AD5F23B7" xlink:to="loc_us-gaap_ScenarioForecastMember_FFA722A21255E3DCDAFCD337AD5FE3D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_9183F6FB3F8AF653B4D2D337AD5FC605" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_771AA7CF929B6199CC2DD337AD5F36B9" xlink:to="loc_srt_RangeAxis_9183F6FB3F8AF653B4D2D337AD5FC605" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_C65A7657684D95D5E33AD337AD5FC848_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9183F6FB3F8AF653B4D2D337AD5FC605" xlink:to="loc_srt_RangeMember_C65A7657684D95D5E33AD337AD5FC848_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_C65A7657684D95D5E33AD337AD5FC848" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9183F6FB3F8AF653B4D2D337AD5FC605" xlink:to="loc_srt_RangeMember_C65A7657684D95D5E33AD337AD5FC848" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_3296264B77521A55CB91D337AD5FD0EE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_C65A7657684D95D5E33AD337AD5FC848" xlink:to="loc_srt_MaximumMember_3296264B77521A55CB91D337AD5FD0EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_839A4C931015D90CA59ED337AD5F8F5D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_C65A7657684D95D5E33AD337AD5FC848" xlink:to="loc_srt_MinimumMember_839A4C931015D90CA59ED337AD5F8F5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_D9B0C200626AA44575BCD337AD5F567C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_771AA7CF929B6199CC2DD337AD5F36B9" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_D9B0C200626AA44575BCD337AD5F567C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_A5A8FED81F441E12E348D337AD5F7EE6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_D9B0C200626AA44575BCD337AD5F567C" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_A5A8FED81F441E12E348D337AD5F7EE6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_A5A8FED81F441E12E348D337AD5F7EE6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_D9B0C200626AA44575BCD337AD5F567C" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_A5A8FED81F441E12E348D337AD5F7EE6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_C9CF96BF044678ABF807D337AD5F1801" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_A5A8FED81F441E12E348D337AD5F7EE6" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_C9CF96BF044678ABF807D337AD5F1801" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_5198E274B733CA0098E2D337AD5FB777" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_A5A8FED81F441E12E348D337AD5F7EE6" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_5198E274B733CA0098E2D337AD5FB777" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodThreeMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_75B834BDCC87236B59BED337AD5F6112" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_A5A8FED81F441E12E348D337AD5F7EE6" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_75B834BDCC87236B59BED337AD5F6112" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodFourMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodFourMember_4B3068786D8CBB7704E7D337AD5FC372" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_A5A8FED81F441E12E348D337AD5F7EE6" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodFourMember_4B3068786D8CBB7704E7D337AD5FC372" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_268C9C1B13C3C5D0544AD337AD5FCC36" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_771AA7CF929B6199CC2DD337AD5F36B9" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_268C9C1B13C3C5D0544AD337AD5FCC36" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5BB3300D22680E3E1AE5D337AD5F49A0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_268C9C1B13C3C5D0544AD337AD5FCC36" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5BB3300D22680E3E1AE5D337AD5F49A0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5BB3300D22680E3E1AE5D337AD5F49A0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_268C9C1B13C3C5D0544AD337AD5FCC36" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5BB3300D22680E3E1AE5D337AD5F49A0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_60742DA1AADFF1779E93D337AD5FE582" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5BB3300D22680E3E1AE5D337AD5F49A0" xlink:to="loc_us-gaap_SeniorNotesMember_60742DA1AADFF1779E93D337AD5FE582" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_2B2DAD61BB642FB9AD49D337AD5F61F7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_38B2519A832B979949E3D337AD5F6CA4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_2B2DAD61BB642FB9AD49D337AD5F61F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_7944FDB585E5CE821510D337AD5F4205" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_38B2519A832B979949E3D337AD5F6CA4" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_7944FDB585E5CE821510D337AD5F4205" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/DebtTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/DefinedBenefitPensionPlans" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/DefinedBenefitPensionPlansTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/DepreciationAndAmortizationBySegmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FD08E018CA4B2F0388C14E3CF49DDD06" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_C01CBE0782A4E279DCE64E3CF49B44EC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FD08E018CA4B2F0388C14E3CF49DDD06" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_C01CBE0782A4E279DCE64E3CF49B44EC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3DE50BAF48603725754E4E3CF49BC074" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_C01CBE0782A4E279DCE64E3CF49B44EC" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3DE50BAF48603725754E4E3CF49BC074" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_48F71F697505D961E4074E3CF49BF653_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3DE50BAF48603725754E4E3CF49BC074" xlink:to="loc_us-gaap_SegmentDomain_48F71F697505D961E4074E3CF49BF653_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_48F71F697505D961E4074E3CF49BF653" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3DE50BAF48603725754E4E3CF49BC074" xlink:to="loc_us-gaap_SegmentDomain_48F71F697505D961E4074E3CF49BF653" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_DeviceSolutionsMember" xlink:label="loc_itri_DeviceSolutionsMember_D6452CFC7C35213151B14E3CF49CDD50" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_48F71F697505D961E4074E3CF49BF653" xlink:to="loc_itri_DeviceSolutionsMember_D6452CFC7C35213151B14E3CF49CDD50" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_NetworkedSolutionsSegmentMember" xlink:label="loc_itri_NetworkedSolutionsSegmentMember_579D5FCAF35AB95168B04E3CF49CC6F7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_48F71F697505D961E4074E3CF49BF653" xlink:to="loc_itri_NetworkedSolutionsSegmentMember_579D5FCAF35AB95168B04E3CF49CC6F7" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_OutcomesSegmentMember" xlink:label="loc_itri_OutcomesSegmentMember_0A52AC21D43A809D40804E3CF49CF809" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_48F71F697505D961E4074E3CF49BF653" xlink:to="loc_itri_OutcomesSegmentMember_0A52AC21D43A809D40804E3CF49CF809" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_NetworksOperatingSegmentMember" xlink:label="loc_itri_NetworksOperatingSegmentMember_D4E5612D1839C13BF72C4E3CF49D69C8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_48F71F697505D961E4074E3CF49BF653" xlink:to="loc_itri_NetworksOperatingSegmentMember_D4E5612D1839C13BF72C4E3CF49D69C8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_4B4DA3745D28049EEC4E4E3CF49DD874" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_48F71F697505D961E4074E3CF49BF653" xlink:to="loc_us-gaap_CorporateNonSegmentMember_4B4DA3745D28049EEC4E4E3CF49DD874" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_499634502B7F0FD53EB14E3CF49E392C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FD08E018CA4B2F0388C14E3CF49DDD06" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_499634502B7F0FD53EB14E3CF49E392C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativeAndNonderivativeHedgingInstrumentFairValueDisclosureDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_FCD936C3FC21B4E62F21635F30B2B33F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_B5A9771B765C01198FD0635F30AF5CFE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_FCD936C3FC21B4E62F21635F30B2B33F" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_B5A9771B765C01198FD0635F30AF5CFE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_8EF20FECF70D2C1DBC1E635F30AFCABB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_B5A9771B765C01198FD0635F30AF5CFE" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_8EF20FECF70D2C1DBC1E635F30AFCABB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_6FCE63BC01B09B6EF6F2635F30AFA13A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8EF20FECF70D2C1DBC1E635F30AFCABB" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_6FCE63BC01B09B6EF6F2635F30AFA13A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_6FCE63BC01B09B6EF6F2635F30AFA13A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8EF20FECF70D2C1DBC1E635F30AFCABB" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_6FCE63BC01B09B6EF6F2635F30AFA13A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_F7F77CD60D3089FBEE0A635F30B0B511" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6FCE63BC01B09B6EF6F2635F30AFA13A" xlink:to="loc_us-gaap_InterestRateSwapMember_F7F77CD60D3089FBEE0A635F30B0B511" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateCapMember" xlink:label="loc_us-gaap_InterestRateCapMember_DA7757C3DA1ABC31437C635F30B05E72" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6FCE63BC01B09B6EF6F2635F30AFA13A" xlink:to="loc_us-gaap_InterestRateCapMember_DA7757C3DA1ABC31437C635F30B05E72" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CurrencySwapMember" xlink:label="loc_us-gaap_CurrencySwapMember_1EC1DD20EAD10D56633D635F30B0CE4B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6FCE63BC01B09B6EF6F2635F30AFA13A" xlink:to="loc_us-gaap_CurrencySwapMember_1EC1DD20EAD10D56633D635F30B0CE4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_498E8B4EF1EF3CF354E4635F30B0DDB9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_B5A9771B765C01198FD0635F30AF5CFE" xlink:to="loc_us-gaap_HedgingDesignationAxis_498E8B4EF1EF3CF354E4635F30B0DDB9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_8169F484907EEC913B58635F30B1D084_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_498E8B4EF1EF3CF354E4635F30B0DDB9" xlink:to="loc_us-gaap_HedgingDesignationDomain_8169F484907EEC913B58635F30B1D084_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_8169F484907EEC913B58635F30B1D084" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_498E8B4EF1EF3CF354E4635F30B0DDB9" xlink:to="loc_us-gaap_HedgingDesignationDomain_8169F484907EEC913B58635F30B1D084" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_0AA510CF90EDE5F5B0B6635F30B17BCC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_8169F484907EEC913B58635F30B1D084" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_0AA510CF90EDE5F5B0B6635F30B17BCC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_0748123636676B8B7A54635F30B1A9C6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_8169F484907EEC913B58635F30B1D084" xlink:to="loc_us-gaap_NondesignatedMember_0748123636676B8B7A54635F30B1A9C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_6F2E4C7AFE89B4DF1B48635F30B18F22" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_B5A9771B765C01198FD0635F30AF5CFE" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_6F2E4C7AFE89B4DF1B48635F30B18F22" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_47E9DB57FF26478CC004635F30B14D65_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_6F2E4C7AFE89B4DF1B48635F30B18F22" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_47E9DB57FF26478CC004635F30B14D65_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_47E9DB57FF26478CC004635F30B14D65" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_6F2E4C7AFE89B4DF1B48635F30B18F22" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_47E9DB57FF26478CC004635F30B14D65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_45180D9B0999B844ED4C635F30B2EC7F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_47E9DB57FF26478CC004635F30B14D65" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_45180D9B0999B844ED4C635F30B2EC7F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNoncurrentAssetsMember" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_90B5B8BB780149C647A7635F30B21C02" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_47E9DB57FF26478CC004635F30B14D65" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_90B5B8BB780149C647A7635F30B21C02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_73584607E3827687445C635F30B29BA6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_47E9DB57FF26478CC004635F30B14D65" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_73584607E3827687445C635F30B29BA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetsAbstract" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_2E54198D05CAEC433D41635F30B2339F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_FCD936C3FC21B4E62F21635F30B2B33F" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_2E54198D05CAEC433D41635F30B2339F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateDerivativeAssetsAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_43D39AE89E72F218EBC6635F30B355DD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_2E54198D05CAEC433D41635F30B2339F" xlink:to="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_43D39AE89E72F218EBC6635F30B355DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignCurrencyFairValueHedgeAssetAtFairValue" xlink:label="loc_us-gaap_ForeignCurrencyFairValueHedgeAssetAtFairValue_11BC1F34F128204DD65C635F30B355F7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_2E54198D05CAEC433D41635F30B2339F" xlink:to="loc_us-gaap_ForeignCurrencyFairValueHedgeAssetAtFairValue_11BC1F34F128204DD65C635F30B355F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue" xlink:label="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_F91DF767857619376C3D635F30B3FFBC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_2E54198D05CAEC433D41635F30B2339F" xlink:to="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_F91DF767857619376C3D635F30B3FFBC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_9A0A6175BB31C5F25250635F30B3EE1B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_2E54198D05CAEC433D41635F30B2339F" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_9A0A6175BB31C5F25250635F30B3EE1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilitiesAbstract" xlink:label="loc_us-gaap_DerivativeLiabilitiesAbstract_3ED6DE26F679371F247A635F30B4F073" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_FCD936C3FC21B4E62F21635F30B2B33F" xlink:to="loc_us-gaap_DerivativeLiabilitiesAbstract_3ED6DE26F679371F247A635F30B4F073" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue" xlink:label="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_299AB5811AAF1970C6C4635F30B428CD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_3ED6DE26F679371F247A635F30B4F073" xlink:to="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_299AB5811AAF1970C6C4635F30B428CD" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativeFinancialInstruments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="itri-20190630.xsd#itri_InterestRateTypeAxis" xlink:label="loc_itri_InterestRateTypeAxis_A89E0267888D69E4220BD337AB3A8230" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:to="loc_itri_InterestRateTypeAxis_A89E0267888D69E4220BD337AB3A8230" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_InterestRateTypeDomain" xlink:label="loc_itri_InterestRateTypeDomain_DA1026B5FD2FC0391B78D337AB3A0442_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_itri_InterestRateTypeAxis_A89E0267888D69E4220BD337AB3A8230" xlink:to="loc_itri_InterestRateTypeDomain_DA1026B5FD2FC0391B78D337AB3A0442_default" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_InterestRateTypeDomain" xlink:label="loc_itri_InterestRateTypeDomain_DA1026B5FD2FC0391B78D337AB3A0442" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_itri_InterestRateTypeAxis_A89E0267888D69E4220BD337AB3A8230" xlink:to="loc_itri_InterestRateTypeDomain_DA1026B5FD2FC0391B78D337AB3A0442" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_E29B278A25140257E3FFD337AB3A8284" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_itri_InterestRateTypeDomain_DA1026B5FD2FC0391B78D337AB3A0442" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_E29B278A25140257E3FFD337AB3A8284" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_A7DA39B957E6606FF2FED337AB3A8BBB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_A7DA39B957E6606FF2FED337AB3A8BBB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_A7DA39B957E6606FF2FED337AB3A8BBB" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_A7DA39B957E6606FF2FED337AB3A8BBB" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_33A29002EF7C61FE7EE2D337AB3A14A7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47" xlink:to="loc_us-gaap_InterestRateSwapMember_33A29002EF7C61FE7EE2D337AB3A14A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateCapMember" xlink:label="loc_us-gaap_InterestRateCapMember_1CDEC769CFEC0B1C2557D337AB3AC555" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47" xlink:to="loc_us-gaap_InterestRateCapMember_1CDEC769CFEC0B1C2557D337AB3AC555" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CurrencySwapMember" xlink:label="loc_us-gaap_CurrencySwapMember_EF27C4D03B622ACA3871D337AB3ABA03" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47" xlink:to="loc_us-gaap_CurrencySwapMember_EF27C4D03B622ACA3871D337AB3ABA03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignExchangeOptionMember" xlink:label="loc_us-gaap_ForeignExchangeOptionMember_A39662E47DFCCAC906DAD337AB3A95B4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47" xlink:to="loc_us-gaap_ForeignExchangeOptionMember_A39662E47DFCCAC906DAD337AB3A95B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForwardContractsMember" xlink:label="loc_us-gaap_ForwardContractsMember_4E03A169613757DB3B52D337AB3AF5CF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47" xlink:to="loc_us-gaap_ForwardContractsMember_4E03A169613757DB3B52D337AB3AF5CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_C4C6D2473F58374CB7C5D337AB3AFC3C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_CEEF04D431424608AF3AD337AB3A3C47" xlink:to="loc_us-gaap_ForeignExchangeContractMember_C4C6D2473F58374CB7C5D337AB3AFC3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_893ED39B14E68624E35AD337AB3AAB52" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:to="loc_us-gaap_VariableRateAxis_893ED39B14E68624E35AD337AB3AAB52" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_566DFF39DD19C4443521D337AB3AD19F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_893ED39B14E68624E35AD337AB3AAB52" xlink:to="loc_us-gaap_VariableRateDomain_566DFF39DD19C4443521D337AB3AD19F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_566DFF39DD19C4443521D337AB3AD19F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_893ED39B14E68624E35AD337AB3AAB52" xlink:to="loc_us-gaap_VariableRateDomain_566DFF39DD19C4443521D337AB3AD19F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_49C1A8D324477CDBAC98D337AB3AD014" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_566DFF39DD19C4443521D337AB3AD19F" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_49C1A8D324477CDBAC98D337AB3AD014" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_DerivativeActivityVolumeTypeAxis" xlink:label="loc_itri_DerivativeActivityVolumeTypeAxis_BD4B0685E65E7AD59EBFD337AB3ACACC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:to="loc_itri_DerivativeActivityVolumeTypeAxis_BD4B0685E65E7AD59EBFD337AB3ACACC" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_DerivativeActivityVolumeTypeDomain" xlink:label="loc_itri_DerivativeActivityVolumeTypeDomain_31A20AEE02B1D9B22168D337AB3A8D1D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_itri_DerivativeActivityVolumeTypeAxis_BD4B0685E65E7AD59EBFD337AB3ACACC" xlink:to="loc_itri_DerivativeActivityVolumeTypeDomain_31A20AEE02B1D9B22168D337AB3A8D1D_default" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_DerivativeActivityVolumeTypeDomain" xlink:label="loc_itri_DerivativeActivityVolumeTypeDomain_31A20AEE02B1D9B22168D337AB3A8D1D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_itri_DerivativeActivityVolumeTypeAxis_BD4B0685E65E7AD59EBFD337AB3ACACC" xlink:to="loc_itri_DerivativeActivityVolumeTypeDomain_31A20AEE02B1D9B22168D337AB3A8D1D" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_NumberOfCounterpartiesMember" xlink:label="loc_itri_NumberOfCounterpartiesMember_1FEA6BE4EA4A3DA65CC3D337AB3A3F82" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_itri_DerivativeActivityVolumeTypeDomain_31A20AEE02B1D9B22168D337AB3A8D1D" xlink:to="loc_itri_NumberOfCounterpartiesMember_1FEA6BE4EA4A3DA65CC3D337AB3A3F82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_80B8AA24D1A717235F37D337AB3AE9B1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_80B8AA24D1A717235F37D337AB3AE9B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_0C4B80D2A4F199D16D3ED337AB3A93DB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_80B8AA24D1A717235F37D337AB3AE9B1" xlink:to="loc_us-gaap_EquityComponentDomain_0C4B80D2A4F199D16D3ED337AB3A93DB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_0C4B80D2A4F199D16D3ED337AB3A93DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_80B8AA24D1A717235F37D337AB3AE9B1" xlink:to="loc_us-gaap_EquityComponentDomain_0C4B80D2A4F199D16D3ED337AB3A93DB" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember" xlink:label="loc_itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember_52CD9BED29BB0DB0EC83D337AB3AA254" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_0C4B80D2A4F199D16D3ED337AB3A93DB" xlink:to="loc_itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember_52CD9BED29BB0DB0EC83D337AB3AA254" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01203108C0CC27210F65D337AB3AE48E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01203108C0CC27210F65D337AB3AE48E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_51E1A8B01AF77D963B6CD337AB3AA5E8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01203108C0CC27210F65D337AB3AE48E" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_51E1A8B01AF77D963B6CD337AB3AA5E8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_51E1A8B01AF77D963B6CD337AB3AA5E8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01203108C0CC27210F65D337AB3AE48E" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_51E1A8B01AF77D963B6CD337AB3AA5E8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="loc_us-gaap_SecuredDebtMember_6FB41CA190E636F00BE1D337AB3A5587" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_51E1A8B01AF77D963B6CD337AB3AA5E8" xlink:to="loc_us-gaap_SecuredDebtMember_6FB41CA190E636F00BE1D337AB3A5587" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_4C28126E32802C9E9348D337AB3A338B" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:to="loc_us-gaap_HedgingDesignationAxis_4C28126E32802C9E9348D337AB3A338B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_DDF08A0D5F471C24121AD337AB3A2D8C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_4C28126E32802C9E9348D337AB3A338B" xlink:to="loc_us-gaap_HedgingDesignationDomain_DDF08A0D5F471C24121AD337AB3A2D8C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_DDF08A0D5F471C24121AD337AB3A2D8C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_4C28126E32802C9E9348D337AB3A338B" xlink:to="loc_us-gaap_HedgingDesignationDomain_DDF08A0D5F471C24121AD337AB3A2D8C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_73023AA1F95F5B8CC9D5D337AB3AA3C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_DDF08A0D5F471C24121AD337AB3A2D8C" xlink:to="loc_us-gaap_NondesignatedMember_73023AA1F95F5B8CC9D5D337AB3AA3C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_D84DE1E91CE2E31ADA25D337AB3AC9C2" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_C3C1EDA259728DA63827D337AB3AC4CA" xlink:to="loc_srt_RangeAxis_D84DE1E91CE2E31ADA25D337AB3AC9C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_70BA0A7AD501ECC87AA3D337AB3A768E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_D84DE1E91CE2E31ADA25D337AB3AC9C2" xlink:to="loc_srt_RangeMember_70BA0A7AD501ECC87AA3D337AB3A768E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_70BA0A7AD501ECC87AA3D337AB3A768E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_D84DE1E91CE2E31ADA25D337AB3AC9C2" xlink:to="loc_srt_RangeMember_70BA0A7AD501ECC87AA3D337AB3A768E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_D8D1E4ACEF64A1362C48D337AB3A61EB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_70BA0A7AD501ECC87AA3D337AB3A768E" xlink:to="loc_srt_MinimumMember_D8D1E4ACEF64A1362C48D337AB3A61EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_DE5B2EBBC96B9806F4D3D337AB3AF792" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_70BA0A7AD501ECC87AA3D337AB3A768E" xlink:to="loc_srt_MaximumMember_DE5B2EBBC96B9806F4D3D337AB3AF792" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_3523AE184796BF6F094BD337AB3A85AE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_3523AE184796BF6F094BD337AB3A85AE" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_DerivativeCounterparties" xlink:label="loc_itri_DerivativeCounterparties_99C3D52BC3D864697033D337AB3A9793" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_itri_DerivativeCounterparties_99C3D52BC3D864697033D337AB3A9793" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_30047F7DD3DFC41FE2D4D337AB3A1483" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_LongTermDebt_30047F7DD3DFC41FE2D4D337AB3A1483" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NumberOfInterestRateDerivativesHeld" xlink:label="loc_us-gaap_NumberOfInterestRateDerivativesHeld_A51865A36AD433E55562D337AB3AAC99" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_NumberOfInterestRateDerivativesHeld_A51865A36AD433E55562D337AB3AAC99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_DerivativeNotionalAmount" xlink:label="loc_invest_DerivativeNotionalAmount_EF3B9DE1E5BC67073DF6D337AB3A15C0" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_invest_DerivativeNotionalAmount_EF3B9DE1E5BC67073DF6D337AB3A15C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeFixedInterestRate" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_53AFF04DBA72FDA98D7ED337AB3ADCE4" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_53AFF04DBA72FDA98D7ED337AB3ADCE4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_B9A6630A7BAA76C25C5CD337AB3A8A7C" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_B9A6630A7BAA76C25C5CD337AB3A8A7C" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_DerivativePurchasePrice" xlink:label="loc_itri_DerivativePurchasePrice_20DA0838C6B0DA28A3DBD337AB3A459A" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_itri_DerivativePurchasePrice_20DA0838C6B0DA28A3DBD337AB3A459A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeCapInterestRate" xlink:label="loc_us-gaap_DerivativeCapInterestRate_7992428D682A3255A18ED337AB3AE772" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_DerivativeCapInterestRate_7992428D682A3255A18ED337AB3AE772" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_75ECFD1980EAEFC2784BD337AB3AD42F" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_75ECFD1980EAEFC2784BD337AB3AD42F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months" xlink:label="loc_us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months_7C24EEDD79CF12ECC968D337AB3AE1B5" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months_7C24EEDD79CF12ECC968D337AB3AE1B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_A7F27BC181C59D3EBC36D337AB3A8C3C" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3913443636CF472341D6D337AB3A3706" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_A7F27BC181C59D3EBC36D337AB3A8C3C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativeFinancialInstrumentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativesNotDesignatedAsHedgingRelationshipsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_24E9444FCB5CD7EA8625D337AE1841D6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_92690EDD4BC67DAB40F8D337AE18451C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_24E9444FCB5CD7EA8625D337AE1841D6" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_92690EDD4BC67DAB40F8D337AE18451C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_F9AE265AE4986C06C42ED337AE184CFC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_92690EDD4BC67DAB40F8D337AE18451C" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_F9AE265AE4986C06C42ED337AE184CFC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_F43D46059A3E2ED66B64D337AE1801DC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_F9AE265AE4986C06C42ED337AE184CFC" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_F43D46059A3E2ED66B64D337AE1801DC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_F43D46059A3E2ED66B64D337AE1801DC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_F9AE265AE4986C06C42ED337AE184CFC" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_F43D46059A3E2ED66B64D337AE1801DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateCapMember" xlink:label="loc_us-gaap_InterestRateCapMember_1593D3C3B027B87AC7BFD337AE187436" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_F43D46059A3E2ED66B64D337AE1801DC" xlink:to="loc_us-gaap_InterestRateCapMember_1593D3C3B027B87AC7BFD337AE187436" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_1EAC68DC017715819F49D337AE18442E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_92690EDD4BC67DAB40F8D337AE18451C" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_1EAC68DC017715819F49D337AE18442E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_7D68DCD63382EE3E7BADD337AE188259_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_1EAC68DC017715819F49D337AE18442E" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_7D68DCD63382EE3E7BADD337AE188259_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_7D68DCD63382EE3E7BADD337AE188259" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_1EAC68DC017715819F49D337AE18442E" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_7D68DCD63382EE3E7BADD337AE188259" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_OtherIncomeExpenseMember" xlink:label="loc_itri_OtherIncomeExpenseMember_F7E2B88D8996D15C9E0AD337AE18CC80" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_7D68DCD63382EE3E7BADD337AE188259" xlink:to="loc_itri_OtherIncomeExpenseMember_F7E2B88D8996D15C9E0AD337AE18CC80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpenseMember" xlink:label="loc_us-gaap_InterestExpenseMember_58DC8E1B5F1EAD8B6DD2D337AE187025" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_7D68DCD63382EE3E7BADD337AE188259" xlink:to="loc_us-gaap_InterestExpenseMember_58DC8E1B5F1EAD8B6DD2D337AE187025" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_25EBEB7169A5DCB362DED337AE18077C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_24E9444FCB5CD7EA8625D337AE1841D6" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_25EBEB7169A5DCB362DED337AE18077C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments" xlink:label="loc_us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments_C9A32E066BD1588B8F56D337AE184CBA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_25EBEB7169A5DCB362DED337AE18077C" xlink:to="loc_us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments_C9A32E066BD1588B8F56D337AE184CBA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments" xlink:label="loc_us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments_6B6147D30C5747CCFC63D337AE18F663" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_25EBEB7169A5DCB362DED337AE18077C" xlink:to="loc_us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments_6B6147D30C5747CCFC63D337AE18F663" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/DocumentAndEntityInformationDocument" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/EarningsPerShare" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/EarningsPerShareStockBasedAwardsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/EarningsPerShareTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/EffectOfCashFlowDerivativesOnBalanceSheetAndIncomeStatementBeforeTaxDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_715F1FB2FB95741BF8FF3A3B1CC25A53" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_0AA5F16B4344D4BB5B323A3B1CC2C38A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_715F1FB2FB95741BF8FF3A3B1CC25A53" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_0AA5F16B4344D4BB5B323A3B1CC2C38A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_AF71BE44839B4F8BA1AC3A3B1CC23B0F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_0AA5F16B4344D4BB5B323A3B1CC2C38A" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_AF71BE44839B4F8BA1AC3A3B1CC23B0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_AF71BE44839B4F8BA1AC3A3B1CC23B0F" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_AF71BE44839B4F8BA1AC3A3B1CC23B0F" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_4138D63ACFB55D8F08323A3B1CC2BFC2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D" xlink:to="loc_us-gaap_InterestRateSwapMember_4138D63ACFB55D8F08323A3B1CC2BFC2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateCapMember" xlink:label="loc_us-gaap_InterestRateCapMember_5CDA954439BE9FE36ED83A3B1CC2C509" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D" xlink:to="loc_us-gaap_InterestRateCapMember_5CDA954439BE9FE36ED83A3B1CC2C509" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignExchangeOptionMember" xlink:label="loc_us-gaap_ForeignExchangeOptionMember_F9B35259196A433668BE3A3B1CC2A7FF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D" xlink:to="loc_us-gaap_ForeignExchangeOptionMember_F9B35259196A433668BE3A3B1CC2A7FF" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_CurrencySwap1Member" xlink:label="loc_itri_CurrencySwap1Member_5F2702CC1242EBAE6AE93A3B1CC219EC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D" xlink:to="loc_itri_CurrencySwap1Member_5F2702CC1242EBAE6AE93A3B1CC219EC" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_CurrencySwap2Member" xlink:label="loc_itri_CurrencySwap2Member_044147B15C90A93182423A3B1CC25837" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D" xlink:to="loc_itri_CurrencySwap2Member_044147B15C90A93182423A3B1CC25837" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CurrencySwapMember" xlink:label="loc_us-gaap_CurrencySwapMember_FAEB71410BFB4A8123093A3B1CC26F41" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_94D5008155B9892E527F3A3B1CC2C04D" xlink:to="loc_us-gaap_CurrencySwapMember_FAEB71410BFB4A8123093A3B1CC26F41" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_495E361A07298FCB96323A3B1CC2B13E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_0AA5F16B4344D4BB5B323A3B1CC2C38A" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_495E361A07298FCB96323A3B1CC2B13E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_D0E64C99B6D88FABE5EC3A3B1CC2CC6C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_495E361A07298FCB96323A3B1CC2B13E" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_D0E64C99B6D88FABE5EC3A3B1CC2CC6C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_D0E64C99B6D88FABE5EC3A3B1CC2CC6C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_495E361A07298FCB96323A3B1CC2B13E" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_D0E64C99B6D88FABE5EC3A3B1CC2CC6C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpenseMember" xlink:label="loc_us-gaap_InterestExpenseMember_CF5EAA0A75FC8BA617CB3A3B1CC22E65" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_D0E64C99B6D88FABE5EC3A3B1CC2CC6C" xlink:to="loc_us-gaap_InterestExpenseMember_CF5EAA0A75FC8BA617CB3A3B1CC22E65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_69181BC36E9FC600E7003A3B1CC21247" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_D0E64C99B6D88FABE5EC3A3B1CC2CC6C" xlink:to="loc_us-gaap_CostOfSalesMember_69181BC36E9FC600E7003A3B1CC21247" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_OtherIncomeExpenseMember" xlink:label="loc_itri_OtherIncomeExpenseMember_22080B59A33EBB3954943A3B1CC2C9E7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_D0E64C99B6D88FABE5EC3A3B1CC2CC6C" xlink:to="loc_itri_OtherIncomeExpenseMember_22080B59A33EBB3954943A3B1CC2C9E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateDerivativesAbstract" xlink:label="loc_us-gaap_InterestRateDerivativesAbstract_10B8E7C7C90544B2C01F3A3B1CC2CE44" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_715F1FB2FB95741BF8FF3A3B1CC25A53" xlink:to="loc_us-gaap_InterestRateDerivativesAbstract_10B8E7C7C90544B2C01F3A3B1CC2CE44" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss" xlink:label="loc_us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss_BE67007542BD1E1001D83A3B1CC2834C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateDerivativesAbstract_10B8E7C7C90544B2C01F3A3B1CC2CE44" xlink:to="loc_us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss_BE67007542BD1E1001D83A3B1CC2834C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_589EC2694C7EB2B3DFA33A3B1CC2CD97" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateDerivativesAbstract_10B8E7C7C90544B2C01F3A3B1CC2CE44" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_589EC2694C7EB2B3DFA33A3B1CC2CD97" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/FairValuesOfFinancialInstruments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/FairValuesOfFinancialInstrumentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/Goodwill" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/GoodwillSilverSpringAcquisitionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_FB2019B8B71289715D853A3B1D3BC158" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6D7A4661515DB813C28E3A3B1D3B9F32" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FB2019B8B71289715D853A3B1D3BC158" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6D7A4661515DB813C28E3A3B1D3B9F32" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_8A92B397F4D7D273C9573A3B1D3B6CE8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6D7A4661515DB813C28E3A3B1D3B9F32" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_8A92B397F4D7D273C9573A3B1D3B6CE8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_541173DC106652B5F2B03A3B1D3BBD08_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8A92B397F4D7D273C9573A3B1D3B6CE8" xlink:to="loc_us-gaap_SegmentDomain_541173DC106652B5F2B03A3B1D3BBD08_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_541173DC106652B5F2B03A3B1D3BBD08" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8A92B397F4D7D273C9573A3B1D3B6CE8" xlink:to="loc_us-gaap_SegmentDomain_541173DC106652B5F2B03A3B1D3BBD08" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_0632CBC9BA8CDFA9CA8A3A3B1D3B8CA9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6D7A4661515DB813C28E3A3B1D3B9F32" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_0632CBC9BA8CDFA9CA8A3A3B1D3B8CA9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EF85CEA05BFE3A3530B13A3B1D3B0B9B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0632CBC9BA8CDFA9CA8A3A3B1D3B8CA9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EF85CEA05BFE3A3530B13A3B1D3B0B9B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EF85CEA05BFE3A3530B13A3B1D3B0B9B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0632CBC9BA8CDFA9CA8A3A3B1D3B8CA9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EF85CEA05BFE3A3530B13A3B1D3B0B9B" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SIlverSpringNetworksInc.Member" xlink:label="loc_itri_SIlverSpringNetworksInc.Member_4BF081AE1B59FEB03EBB3A3B1D3BCB96" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EF85CEA05BFE3A3530B13A3B1D3B0B9B" xlink:to="loc_itri_SIlverSpringNetworksInc.Member_4BF081AE1B59FEB03EBB3A3B1D3BCB96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_A60E14434B1E56356BE13A3B1D3BB1D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FB2019B8B71289715D853A3B1D3BC158" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_A60E14434B1E56356BE13A3B1D3BB1D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_06869DCCF15B91BFAECD3A3B1D3BDBA5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FB2019B8B71289715D853A3B1D3BC158" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_06869DCCF15B91BFAECD3A3B1D3BDBA5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAcquiredFromAcquisition" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_C64247B6FE0A893517073A3B1D3BDF0F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FB2019B8B71289715D853A3B1D3BC158" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_C64247B6FE0A893517073A3B1D3BDF0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_CF100F2C8F73521A92CB3A3B1D3BDDB7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FB2019B8B71289715D853A3B1D3BC158" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_CF100F2C8F73521A92CB3A3B1D3BDDB7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_14E39ED61C5BB02098B43A3B1D3B5FEA" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FB2019B8B71289715D853A3B1D3BC158" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_14E39ED61C5BB02098B43A3B1D3B5FEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_96791ED11DFB5356CD743A3B1D3B4201" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FB2019B8B71289715D853A3B1D3BC158" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_96791ED11DFB5356CD743A3B1D3B4201" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill_DC8E856E072EE9B7A7BA3A3B1D3B6DE2" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_FB2019B8B71289715D853A3B1D3BC158" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill_DC8E856E072EE9B7A7BA3A3B1D3B6DE2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/GoodwillTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/IncomeTaxContingenciesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxExaminationLineItems" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_F4B992A418978BC1077E27B2E54E3F33" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxExaminationTable" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_337E0658709D1B1BC80227B2E54B7C0C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_F4B992A418978BC1077E27B2E54E3F33" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_337E0658709D1B1BC80227B2E54B7C0C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_DB39A6680B8F8BC1A3C927B2E54C19D2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_337E0658709D1B1BC80227B2E54B7C0C" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_DB39A6680B8F8BC1A3C927B2E54C19D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_D883DB8C6685DB73D12527B2E54CECCB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_DB39A6680B8F8BC1A3C927B2E54C19D2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_D883DB8C6685DB73D12527B2E54CECCB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_D883DB8C6685DB73D12527B2E54CECCB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_DB39A6680B8F8BC1A3C927B2E54C19D2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_D883DB8C6685DB73D12527B2E54CECCB" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SSNIPlanMember" xlink:label="loc_itri_SSNIPlanMember_E2DF11ACD6BEFF87784F27B2E54DD66B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_D883DB8C6685DB73D12527B2E54CECCB" xlink:to="loc_itri_SSNIPlanMember_E2DF11ACD6BEFF87784F27B2E54DD66B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_D1971A5ECA7138D7BCA827B2E54DA6E7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_337E0658709D1B1BC80227B2E54B7C0C" xlink:to="loc_srt_RangeAxis_D1971A5ECA7138D7BCA827B2E54DA6E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_2343AD33861FFE2FB80327B2E54D47AA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_D1971A5ECA7138D7BCA827B2E54DA6E7" xlink:to="loc_srt_RangeMember_2343AD33861FFE2FB80327B2E54D47AA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_2343AD33861FFE2FB80327B2E54D47AA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_D1971A5ECA7138D7BCA827B2E54DA6E7" xlink:to="loc_srt_RangeMember_2343AD33861FFE2FB80327B2E54D47AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_4AFF5933907745920DF127B2E54DE267" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2343AD33861FFE2FB80327B2E54D47AA" xlink:to="loc_srt_MinimumMember_4AFF5933907745920DF127B2E54DE267" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_768AD11E955BF109573927B2E54E3EF0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2343AD33861FFE2FB80327B2E54D47AA" xlink:to="loc_srt_MaximumMember_768AD11E955BF109573927B2E54E3EF0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_4AD6777E304D8893F83127B2E54E2FC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_F4B992A418978BC1077E27B2E54E3F33" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_4AD6777E304D8893F83127B2E54E2FC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_52F2A52A539A61DCEFE327B2E54EA7F3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_F4B992A418978BC1077E27B2E54E3F33" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_52F2A52A539A61DCEFE327B2E54EA7F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OpenTaxYear" xlink:label="loc_us-gaap_OpenTaxYear_59ED4BF1EE0541B8324727B2E54F011A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_F4B992A418978BC1077E27B2E54E3F33" xlink:to="loc_us-gaap_OpenTaxYear_59ED4BF1EE0541B8324727B2E54F011A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/InformationBySegmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_BD17277E40829AA1AD1C4E3CF4CABEF4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_47C7F7137BE2843BE91F4E3CF4C69AC0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_BD17277E40829AA1AD1C4E3CF4CABEF4" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_47C7F7137BE2843BE91F4E3CF4C69AC0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_8131A6FC9BD90166246F4E3CF4C69715" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_47C7F7137BE2843BE91F4E3CF4C69AC0" xlink:to="loc_srt_ProductOrServiceAxis_8131A6FC9BD90166246F4E3CF4C69715" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_0C2E611D20EA57EC520D4E3CF4C6C6D5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_8131A6FC9BD90166246F4E3CF4C69715" xlink:to="loc_srt_ProductsAndServicesDomain_0C2E611D20EA57EC520D4E3CF4C6C6D5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_0C2E611D20EA57EC520D4E3CF4C6C6D5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_8131A6FC9BD90166246F4E3CF4C69715" xlink:to="loc_srt_ProductsAndServicesDomain_0C2E611D20EA57EC520D4E3CF4C6C6D5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductMember" xlink:label="loc_us-gaap_ProductMember_CCDDCC8D8B7CEF9C50214E3CF4C77798" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0C2E611D20EA57EC520D4E3CF4C6C6D5" xlink:to="loc_us-gaap_ProductMember_CCDDCC8D8B7CEF9C50214E3CF4C77798" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ServiceMember" xlink:label="loc_us-gaap_ServiceMember_92B272311201E96A79E74E3CF4C7C0C3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0C2E611D20EA57EC520D4E3CF4C6C6D5" xlink:to="loc_us-gaap_ServiceMember_92B272311201E96A79E74E3CF4C7C0C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_E1911DF6B954680370C04E3CF4C79322" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_47C7F7137BE2843BE91F4E3CF4C69AC0" xlink:to="loc_srt_ConsolidationItemsAxis_E1911DF6B954680370C04E3CF4C79322" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_E539A03296D469DF31A14E3CF4C74D0A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_E1911DF6B954680370C04E3CF4C79322" xlink:to="loc_srt_ConsolidationItemsDomain_E539A03296D469DF31A14E3CF4C74D0A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_E539A03296D469DF31A14E3CF4C74D0A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_E1911DF6B954680370C04E3CF4C79322" xlink:to="loc_srt_ConsolidationItemsDomain_E539A03296D469DF31A14E3CF4C74D0A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_C3C108FCAB3B07B7E4D24E3CF4C8B764" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_E539A03296D469DF31A14E3CF4C74D0A" xlink:to="loc_us-gaap_CorporateNonSegmentMember_C3C108FCAB3B07B7E4D24E3CF4C8B764" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_007E92B45AC6C94B6F304E3CF4C84A03" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_47C7F7137BE2843BE91F4E3CF4C69AC0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_007E92B45AC6C94B6F304E3CF4C84A03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_934F1456B54C4CBE40044E3CF4C882DD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_007E92B45AC6C94B6F304E3CF4C84A03" xlink:to="loc_us-gaap_SegmentDomain_934F1456B54C4CBE40044E3CF4C882DD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_934F1456B54C4CBE40044E3CF4C882DD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_007E92B45AC6C94B6F304E3CF4C84A03" xlink:to="loc_us-gaap_SegmentDomain_934F1456B54C4CBE40044E3CF4C882DD" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_DeviceSolutionsMember" xlink:label="loc_itri_DeviceSolutionsMember_2F4533076AE985FDB7A74E3CF4C855A7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_934F1456B54C4CBE40044E3CF4C882DD" xlink:to="loc_itri_DeviceSolutionsMember_2F4533076AE985FDB7A74E3CF4C855A7" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_NetworkedSolutionsSegmentMember" xlink:label="loc_itri_NetworkedSolutionsSegmentMember_3298E44ABE93D83C2FCD4E3CF4C9F92D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_934F1456B54C4CBE40044E3CF4C882DD" xlink:to="loc_itri_NetworkedSolutionsSegmentMember_3298E44ABE93D83C2FCD4E3CF4C9F92D" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_OutcomesSegmentMember" xlink:label="loc_itri_OutcomesSegmentMember_D8ABBFD8A92E4A650FB54E3CF4C96FBB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_934F1456B54C4CBE40044E3CF4C882DD" xlink:to="loc_itri_OutcomesSegmentMember_D8ABBFD8A92E4A650FB54E3CF4C96FBB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_072CDCDB978F741BC6624E3CF4CA9183" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_934F1456B54C4CBE40044E3CF4C882DD" xlink:to="loc_us-gaap_CorporateNonSegmentMember_072CDCDB978F741BC6624E3CF4CA9183" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_DA3477E4A2A2BB6A33BB4E3CF4CAA81C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_BD17277E40829AA1AD1C4E3CF4CABEF4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_DA3477E4A2A2BB6A33BB4E3CF4CAA81C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_C2B4F1EEF84BCC5E27E54E3CF4CAFD38" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_BD17277E40829AA1AD1C4E3CF4CABEF4" xlink:to="loc_us-gaap_GrossProfit_C2B4F1EEF84BCC5E27E54E3CF4CAFD38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_8E9A6B640B4E957780404E3CF4CBDA3A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_BD17277E40829AA1AD1C4E3CF4CABEF4" xlink:to="loc_us-gaap_OperatingIncomeLoss_8E9A6B640B4E957780404E3CF4CBDA3A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_4DC760A42BDC5DD1EB0C4E3CF4CB115B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_BD17277E40829AA1AD1C4E3CF4CABEF4" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_4DC760A42BDC5DD1EB0C4E3CF4CB115B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_BB28BF6946FA8770C5564E3CF4CB8C9C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_BD17277E40829AA1AD1C4E3CF4CABEF4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_BB28BF6946FA8770C5564E3CF4CB8C9C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/IntangibleAssetsAndLiabilities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/IntangibleAssetsAndLiabilitiesEstimatedFutureAnnualAmortizationExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/IntangibleAssetsAndLiabilitiesGrossCarryingAmountAndAccumulatedAmortizationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_D0AC7FDD4BF5FD97F4CAD337AD4029E0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_D0AC7FDD4BF5FD97F4CAD337AD4029E0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_8F71591234E77456E709D337AD409C74" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_D0AC7FDD4BF5FD97F4CAD337AD4029E0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_8F71591234E77456E709D337AD409C74" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1D6491E4F54125ECCD1BD337AD40686A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_8F71591234E77456E709D337AD409C74" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1D6491E4F54125ECCD1BD337AD40686A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1D6491E4F54125ECCD1BD337AD40686A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_8F71591234E77456E709D337AD409C74" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1D6491E4F54125ECCD1BD337AD40686A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_B900E25F838617A358ADD337AD40D393" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1D6491E4F54125ECCD1BD337AD40686A" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_B900E25F838617A358ADD337AD40D393" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_E392C50C46EF6C15F46CD337AD404076" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1D6491E4F54125ECCD1BD337AD40686A" xlink:to="loc_us-gaap_CustomerRelationshipsMember_E392C50C46EF6C15F46CD337AD404076" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_BE803FD1C32ABA7F8278D337AD40CF22" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1D6491E4F54125ECCD1BD337AD40686A" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_BE803FD1C32ABA7F8278D337AD40CF22" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_84B932E01C43B351F15AD337AD40249E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1D6491E4F54125ECCD1BD337AD40686A" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_84B932E01C43B351F15AD337AD40249E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InProcessResearchAndDevelopmentMember" xlink:label="loc_us-gaap_InProcessResearchAndDevelopmentMember_3B50DE4DD164F686EF44D337AD40FFD0" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1D6491E4F54125ECCD1BD337AD40686A" xlink:to="loc_us-gaap_InProcessResearchAndDevelopmentMember_3B50DE4DD164F686EF44D337AD40FFD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_7666D835F91BEAAB5961D337AD4023F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_7666D835F91BEAAB5961D337AD4023F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_046E04899BD82E176359D337AD400D6C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_046E04899BD82E176359D337AD400D6C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_EC6A5AB787631DC03C1AD337AD404CED" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_EC6A5AB787631DC03C1AD337AD404CED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_5139842BB81CD5C298DCD337AD406019" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_5139842BB81CD5C298DCD337AD406019" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_D1D55E6AF5AE806AB8B4D337AD40BD4B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_D1D55E6AF5AE806AB8B4D337AD40BD4B" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_FinitelivedintangibleliabilitiesGross" xlink:label="loc_itri_FinitelivedintangibleliabilitiesGross_87AECD8424AD433A91D9D337AD4F45EE" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:to="loc_itri_FinitelivedintangibleliabilitiesGross_87AECD8424AD433A91D9D337AD4F45EE" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_FiniteLivedIntangibleLiabilitiesAccumulatedAccretion" xlink:label="loc_itri_FiniteLivedIntangibleLiabilitiesAccumulatedAccretion_3DE093CC7E749C99A892D337AD4FEC8A" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:to="loc_itri_FiniteLivedIntangibleLiabilitiesAccumulatedAccretion_3DE093CC7E749C99A892D337AD4FEC8A" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_FiniteLivedIntangibleLiabilitiesNet" xlink:label="loc_itri_FiniteLivedIntangibleLiabilitiesNet_0A1C61A41A79FF3EC51ED337AD4FF555" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_2A4D72F7C3AE7EFE8B08D337AD4065E4" xlink:to="loc_itri_FiniteLivedIntangibleLiabilitiesNet_0A1C61A41A79FF3EC51ED337AD4FF555" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/IntangibleAssetsAndLiabilitiesIntangibleAssetsNarrativeDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/IntangibleAssetsAndLiabilitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/Leases" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/LeasesComponentsOfLeaseExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/LeasesFutureObligationsUnderOperatingLeasesBeforeAsuAdoptionDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_11A0BEC6A2C939CF4653D337ACB77F0E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_B692F54BF2EBD3D30A52D337ACB77973" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_11A0BEC6A2C939CF4653D337ACB77F0E" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_B692F54BF2EBD3D30A52D337ACB77973" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_AA9638197EF35428A7D5D337ACB70038" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_B692F54BF2EBD3D30A52D337ACB77973" xlink:to="loc_srt_RangeAxis_AA9638197EF35428A7D5D337ACB70038" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_BCD10B121089BB5E88C4D337ACB77821_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_AA9638197EF35428A7D5D337ACB70038" xlink:to="loc_srt_RangeMember_BCD10B121089BB5E88C4D337ACB77821_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_BCD10B121089BB5E88C4D337ACB77821" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_AA9638197EF35428A7D5D337ACB70038" xlink:to="loc_srt_RangeMember_BCD10B121089BB5E88C4D337ACB77821" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_110147AD3A700787878DD337ACB7A41C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_BCD10B121089BB5E88C4D337ACB77821" xlink:to="loc_srt_MinimumMember_110147AD3A700787878DD337ACB7A41C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_A197CB843AF9FD12654AD337ACB73D0D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_BCD10B121089BB5E88C4D337ACB77821" xlink:to="loc_srt_MaximumMember_A197CB843AF9FD12654AD337ACB73D0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_5BC68C63FB6C23282394D337ACB72E04" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_11A0BEC6A2C939CF4653D337ACB77F0E" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_5BC68C63FB6C23282394D337ACB72E04" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_818219EB0BB400392796D337ACB7100F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_11A0BEC6A2C939CF4653D337ACB77F0E" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_818219EB0BB400392796D337ACB7100F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/LeasesRemainingMaturitiesOfOperatingLeaseLiabilitiesAfterAsuAdoptionDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/LeasesSupplementalCashFlowInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/LeasesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/OffsettingOfDerivativeAssetsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/OffsettingOfDerivativeLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/Restructuring" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/RestructuringAdditionalInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/RestructuringExpectedCosts2016ProjectsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_643A5081CC2F11B4A0EB6325D2DF1F93" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6965EBEC91AB82FFC0156325D2D7A652" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_643A5081CC2F11B4A0EB6325D2DF1F93" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6965EBEC91AB82FFC0156325D2D7A652" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_74D4DEE8DD45B14853E46325D2D9BFB1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6965EBEC91AB82FFC0156325D2D7A652" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_74D4DEE8DD45B14853E46325D2D9BFB1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_5A0BDF49FF0FE2DAE70363264351688C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_74D4DEE8DD45B14853E46325D2D9BFB1" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_5A0BDF49FF0FE2DAE70363264351688C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_5A0BDF49FF0FE2DAE70363264351688C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_74D4DEE8DD45B14853E46325D2D9BFB1" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_5A0BDF49FF0FE2DAE70363264351688C" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_StretfordMember" xlink:label="loc_itri_StretfordMember_F52D662D238BF95128266325D2D9E497" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_5A0BDF49FF0FE2DAE70363264351688C" xlink:to="loc_itri_StretfordMember_F52D662D238BF95128266325D2D9E497" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6F4CC526C8CDAAB395086325D2DABA34" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6965EBEC91AB82FFC0156325D2D7A652" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6F4CC526C8CDAAB395086325D2DABA34" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_001EB11C7C4D4F245DFD6325D2DA5774_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6F4CC526C8CDAAB395086325D2DABA34" xlink:to="loc_us-gaap_SegmentDomain_001EB11C7C4D4F245DFD6325D2DA5774_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_001EB11C7C4D4F245DFD6325D2DA5774" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6F4CC526C8CDAAB395086325D2DABA34" xlink:to="loc_us-gaap_SegmentDomain_001EB11C7C4D4F245DFD6325D2DA5774" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_ElectricityOperatingSegmentMember" xlink:label="loc_itri_ElectricityOperatingSegmentMember_4025FCD6F52F9012FCF66325D2DBAC38" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_001EB11C7C4D4F245DFD6325D2DA5774" xlink:to="loc_itri_ElectricityOperatingSegmentMember_4025FCD6F52F9012FCF66325D2DBAC38" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_GasOperatingSegmentMember" xlink:label="loc_itri_GasOperatingSegmentMember_AC2C4EBD8B7166EAD54B6325D2DBCE76" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_001EB11C7C4D4F245DFD6325D2DA5774" xlink:to="loc_itri_GasOperatingSegmentMember_AC2C4EBD8B7166EAD54B6325D2DBCE76" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_WaterOperatingSegmentMember" xlink:label="loc_itri_WaterOperatingSegmentMember_37D4238483564C7110286325D2DB5C48" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_001EB11C7C4D4F245DFD6325D2DA5774" xlink:to="loc_itri_WaterOperatingSegmentMember_37D4238483564C7110286325D2DB5C48" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_1F6EA7422158C30776D96325D2DCEEC0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_001EB11C7C4D4F245DFD6325D2DA5774" xlink:to="loc_us-gaap_CorporateNonSegmentMember_1F6EA7422158C30776D96325D2DCEEC0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_88F551D155E21B4F80756325D2DC4721" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6965EBEC91AB82FFC0156325D2D7A652" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_88F551D155E21B4F80756325D2DC4721" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_8CA2608F1D52BAAAFCD46325D2DCE9A6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_88F551D155E21B4F80756325D2DC4721" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_8CA2608F1D52BAAAFCD46325D2DCE9A6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_8CA2608F1D52BAAAFCD46325D2DCE9A6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_88F551D155E21B4F80756325D2DC4721" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_8CA2608F1D52BAAAFCD46325D2DCE9A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_93DFC4A1FC14D3B2F84E6325D2DCC298" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_8CA2608F1D52BAAAFCD46325D2DCE9A6" xlink:to="loc_us-gaap_EmployeeSeveranceMember_93DFC4A1FC14D3B2F84E6325D2DCC298" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember" xlink:label="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_BC3D2EDEC775BAF3BF106325D2DD4F33" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_8CA2608F1D52BAAAFCD46325D2DCE9A6" xlink:to="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_BC3D2EDEC775BAF3BF106325D2DD4F33" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherRestructuringMember" xlink:label="loc_us-gaap_OtherRestructuringMember_2F352F44F99833C4C8176325D2DD3F1E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_8CA2608F1D52BAAAFCD46325D2DCE9A6" xlink:to="loc_us-gaap_OtherRestructuringMember_2F352F44F99833C4C8176325D2DD3F1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringPlanAxis" xlink:label="loc_us-gaap_RestructuringPlanAxis_72887B41FB8F213905ED6325D2DD7306" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6965EBEC91AB82FFC0156325D2D7A652" xlink:to="loc_us-gaap_RestructuringPlanAxis_72887B41FB8F213905ED6325D2DD7306" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_0A11F7A2D7B5485FE93C6325D2DE3F56_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_72887B41FB8F213905ED6325D2DD7306" xlink:to="loc_us-gaap_RestructuringPlanDomain_0A11F7A2D7B5485FE93C6325D2DE3F56_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_0A11F7A2D7B5485FE93C6325D2DE3F56" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_72887B41FB8F213905ED6325D2DD7306" xlink:to="loc_us-gaap_RestructuringPlanDomain_0A11F7A2D7B5485FE93C6325D2DE3F56" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_A2016ProjectsMember" xlink:label="loc_itri_A2016ProjectsMember_075D1BC6D6CAD537448D6325D2DE474B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_0A11F7A2D7B5485FE93C6325D2DE3F56" xlink:to="loc_itri_A2016ProjectsMember_075D1BC6D6CAD537448D6325D2DE474B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfProperties" xlink:label="loc_us-gaap_GainLossOnSaleOfProperties_827C110D988BDEBB5E706325D2DFF1EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_643A5081CC2F11B4A0EB6325D2DF1F93" xlink:to="loc_us-gaap_GainLossOnSaleOfProperties_827C110D988BDEBB5E706325D2DFF1EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_5F7C8E2128F5548AED566325D2DF3061" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_643A5081CC2F11B4A0EB6325D2DF1F93" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_5F7C8E2128F5548AED566325D2DF3061" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_016563FCAA6DDE858FCD6325D2E02B20" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_643A5081CC2F11B4A0EB6325D2DF1F93" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_016563FCAA6DDE858FCD6325D2E02B20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_0FB04A251F9510EB91C96325D2E08955" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_643A5081CC2F11B4A0EB6325D2DF1F93" xlink:to="loc_us-gaap_RestructuringCharges_0FB04A251F9510EB91C96325D2E08955" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_A82C390160FC7D2EE2A86325D2E03B75" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_643A5081CC2F11B4A0EB6325D2DF1F93" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_A82C390160FC7D2EE2A86325D2E03B75" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/RestructuringRelatedBalanceSheetActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_43B89B3F5F6257A4405849ABE1EC20D0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_A3CE1828583F169CEF1249ABE1E56D12" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_43B89B3F5F6257A4405849ABE1EC20D0" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_A3CE1828583F169CEF1249ABE1E56D12" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_F63CB7BCEDFD02111CEE49ABE1E6334D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_A3CE1828583F169CEF1249ABE1E56D12" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_F63CB7BCEDFD02111CEE49ABE1E6334D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_3F7FBAC0A9BD5CEC3EB549ABE1E6AD8B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_F63CB7BCEDFD02111CEE49ABE1E6334D" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_3F7FBAC0A9BD5CEC3EB549ABE1E6AD8B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_3F7FBAC0A9BD5CEC3EB549ABE1E6AD8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_F63CB7BCEDFD02111CEE49ABE1E6334D" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_3F7FBAC0A9BD5CEC3EB549ABE1E6AD8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_CC2CB8E0321D6E67B4A749ABE1EBAC8A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_3F7FBAC0A9BD5CEC3EB549ABE1E6AD8B" xlink:to="loc_us-gaap_EmployeeSeveranceMember_CC2CB8E0321D6E67B4A749ABE1EBAC8A" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember" xlink:label="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_FD0F9D61E53BFE9F7ED349ABE1EBBBC7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_3F7FBAC0A9BD5CEC3EB549ABE1E6AD8B" xlink:to="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_FD0F9D61E53BFE9F7ED349ABE1EBBBC7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherRestructuringMember" xlink:label="loc_us-gaap_OtherRestructuringMember_D36DC6A9935B4F3685C249ABE1ECEB1E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_3F7FBAC0A9BD5CEC3EB549ABE1E6AD8B" xlink:to="loc_us-gaap_OtherRestructuringMember_D36DC6A9935B4F3685C249ABE1ECEB1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_AD23F5578C5798BED1DD49ABE1ECE4A6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_43B89B3F5F6257A4405849ABE1EC20D0" xlink:to="loc_us-gaap_RestructuringReserve_AD23F5578C5798BED1DD49ABE1ECE4A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_CD91E5E33928DDD55F9F49ABE1ED9DF3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_43B89B3F5F6257A4405849ABE1EC20D0" xlink:to="loc_us-gaap_RestructuringCharges_CD91E5E33928DDD55F9F49ABE1ED9DF3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsForRestructuring" xlink:label="loc_us-gaap_PaymentsForRestructuring_167304169AAB1A68A62B49ABE1ED0A12" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_43B89B3F5F6257A4405849ABE1EC20D0" xlink:to="loc_us-gaap_PaymentsForRestructuring_167304169AAB1A68A62B49ABE1ED0A12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCostsAndAssetImpairmentCharges" xlink:label="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_3A783CBFE5F0F6A05B8B49ABE1EDD014" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_43B89B3F5F6257A4405849ABE1EC20D0" xlink:to="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_3A783CBFE5F0F6A05B8B49ABE1EDD014" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringReserveTranslationAdjustment" xlink:label="loc_us-gaap_RestructuringReserveTranslationAdjustment_C7C4323CE849FCB1FDAC49ABE1EDA053" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_43B89B3F5F6257A4405849ABE1EC20D0" xlink:to="loc_us-gaap_RestructuringReserveTranslationAdjustment_C7C4323CE849FCB1FDAC49ABE1EDA053" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/RestructuringRestructuringExpectedCosts2018ProjectsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_5BEA5D343DA12C67C449D337AB1BD7A2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_DA0CB19C7FAE7B010F1DD337AB1BA87C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_5BEA5D343DA12C67C449D337AB1BD7A2" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_DA0CB19C7FAE7B010F1DD337AB1BA87C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5BE496AB29E394D63765D337AB1BACF3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_DA0CB19C7FAE7B010F1DD337AB1BA87C" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5BE496AB29E394D63765D337AB1BACF3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_12E52AF695AC439418E8D337AB1B78AE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5BE496AB29E394D63765D337AB1BACF3" xlink:to="loc_us-gaap_SegmentDomain_12E52AF695AC439418E8D337AB1B78AE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_12E52AF695AC439418E8D337AB1B78AE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5BE496AB29E394D63765D337AB1BACF3" xlink:to="loc_us-gaap_SegmentDomain_12E52AF695AC439418E8D337AB1B78AE" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_ElectricityOperatingSegmentMember" xlink:label="loc_itri_ElectricityOperatingSegmentMember_0B20B2FD877ACD9183ADD337AB1B2667" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_12E52AF695AC439418E8D337AB1B78AE" xlink:to="loc_itri_ElectricityOperatingSegmentMember_0B20B2FD877ACD9183ADD337AB1B2667" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_GasOperatingSegmentMember" xlink:label="loc_itri_GasOperatingSegmentMember_8D08D138BFF66BD1C298D337AB1B624E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_12E52AF695AC439418E8D337AB1B78AE" xlink:to="loc_itri_GasOperatingSegmentMember_8D08D138BFF66BD1C298D337AB1B624E" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_WaterOperatingSegmentMember" xlink:label="loc_itri_WaterOperatingSegmentMember_93C017E873217E594641D337AB1B770C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_12E52AF695AC439418E8D337AB1B78AE" xlink:to="loc_itri_WaterOperatingSegmentMember_93C017E873217E594641D337AB1B770C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_D04EB023BC3B6F2AC284D337AB1B65CB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_12E52AF695AC439418E8D337AB1B78AE" xlink:to="loc_us-gaap_CorporateNonSegmentMember_D04EB023BC3B6F2AC284D337AB1B65CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_73641D8C1926FFDF3247D337AB1B957E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_DA0CB19C7FAE7B010F1DD337AB1BA87C" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_73641D8C1926FFDF3247D337AB1B957E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_5BF4A53ABA3D6FFA5F21D337AB1BD5EA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_73641D8C1926FFDF3247D337AB1B957E" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_5BF4A53ABA3D6FFA5F21D337AB1BD5EA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_5BF4A53ABA3D6FFA5F21D337AB1BD5EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_73641D8C1926FFDF3247D337AB1B957E" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_5BF4A53ABA3D6FFA5F21D337AB1BD5EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_CF35FD82F9AFCCA0D3D8D337AB1B8999" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_5BF4A53ABA3D6FFA5F21D337AB1BD5EA" xlink:to="loc_us-gaap_EmployeeSeveranceMember_CF35FD82F9AFCCA0D3D8D337AB1B8999" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember" xlink:label="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_781562852FE178E7F7FAD337AB1B16B8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_5BF4A53ABA3D6FFA5F21D337AB1BD5EA" xlink:to="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_781562852FE178E7F7FAD337AB1B16B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherRestructuringMember" xlink:label="loc_us-gaap_OtherRestructuringMember_B8FA34CFD81E8061CFF2D337AB1B299A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_5BF4A53ABA3D6FFA5F21D337AB1BD5EA" xlink:to="loc_us-gaap_OtherRestructuringMember_B8FA34CFD81E8061CFF2D337AB1B299A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringPlanAxis" xlink:label="loc_us-gaap_RestructuringPlanAxis_B59F5C49AA3ED90D4683D337AB1BF559" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_DA0CB19C7FAE7B010F1DD337AB1BA87C" xlink:to="loc_us-gaap_RestructuringPlanAxis_B59F5C49AA3ED90D4683D337AB1BF559" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_5BE84445B91B6A494C73D337AB1B9674_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_B59F5C49AA3ED90D4683D337AB1BF559" xlink:to="loc_us-gaap_RestructuringPlanDomain_5BE84445B91B6A494C73D337AB1B9674_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_5BE84445B91B6A494C73D337AB1B9674" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_B59F5C49AA3ED90D4683D337AB1BF559" xlink:to="loc_us-gaap_RestructuringPlanDomain_5BE84445B91B6A494C73D337AB1B9674" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_A2018ProjectsMember" xlink:label="loc_itri_A2018ProjectsMember_D4E879B99609F0E35911D337AB1B63D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_5BE84445B91B6A494C73D337AB1B9674" xlink:to="loc_itri_A2018ProjectsMember_D4E879B99609F0E35911D337AB1B63D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_A86B3DCDDA3106127831D337AB1BDC0A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_5BEA5D343DA12C67C449D337AB1BD7A2" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_A86B3DCDDA3106127831D337AB1BDC0A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_97A8DE6332AB90484C16D337AB1B8A3A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_5BEA5D343DA12C67C449D337AB1BD7A2" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_97A8DE6332AB90484C16D337AB1B8A3A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_3A8AE05AD0C3B1023834D337AB1B706C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_5BEA5D343DA12C67C449D337AB1BD7A2" xlink:to="loc_us-gaap_RestructuringCharges_3A8AE05AD0C3B1023834D337AB1B706C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_BB0155A5B182D1D3E83DD337AB1BE668" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_5BEA5D343DA12C67C449D337AB1BD7A2" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_BB0155A5B182D1D3E83DD337AB1BE668" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/RestructuringTables" xlink:type="extended">
    <link:loc xlink:href="itri-20190630.xsd#itri_RestructuringProjectLineItems" xlink:label="loc_itri_RestructuringProjectLineItems_8EAE736026B880A58B7FD337AC125D7B" xlink:type="locator" />
    <link:loc xlink:href="itri-20190630.xsd#itri_RestructuringProjectTable" xlink:label="loc_itri_RestructuringProjectTable_22BA1E1FC4D51649DF64D337AC12FCEC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_itri_RestructuringProjectLineItems_8EAE736026B880A58B7FD337AC125D7B" xlink:to="loc_itri_RestructuringProjectTable_22BA1E1FC4D51649DF64D337AC12FCEC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringPlanAxis" xlink:label="loc_us-gaap_RestructuringPlanAxis_00A48D3FE553A6A96FAAD337AC1284CE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_itri_RestructuringProjectTable_22BA1E1FC4D51649DF64D337AC12FCEC" xlink:to="loc_us-gaap_RestructuringPlanAxis_00A48D3FE553A6A96FAAD337AC1284CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_5C79455D9666C2AB6EF8D337AC121D86_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_00A48D3FE553A6A96FAAD337AC1284CE" xlink:to="loc_us-gaap_RestructuringPlanDomain_5C79455D9666C2AB6EF8D337AC121D86_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_5C79455D9666C2AB6EF8D337AC121D86" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_00A48D3FE553A6A96FAAD337AC1284CE" xlink:to="loc_us-gaap_RestructuringPlanDomain_5C79455D9666C2AB6EF8D337AC121D86" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_A2018ProjectsMember" xlink:label="loc_itri_A2018ProjectsMember_9BE24F994936753E5257D337AC12D639" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_5C79455D9666C2AB6EF8D337AC121D86" xlink:to="loc_itri_A2018ProjectsMember_9BE24F994936753E5257D337AC12D639" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_A2016ProjectsMember" xlink:label="loc_itri_A2016ProjectsMember_4975B40A4992EEDC2615D337AC125DCC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_5C79455D9666C2AB6EF8D337AC121D86" xlink:to="loc_itri_A2016ProjectsMember_4975B40A4992EEDC2615D337AC125DCC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_12AD5898297FAE66BCCDD337AC128655" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_itri_RestructuringProjectLineItems_8EAE736026B880A58B7FD337AC125D7B" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_12AD5898297FAE66BCCDD337AC128655" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock" xlink:label="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_99E4EA106069263F2D28D337AC12D643" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_itri_RestructuringProjectLineItems_8EAE736026B880A58B7FD337AC125D7B" xlink:to="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_99E4EA106069263F2D28D337AC12D643" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/RevenueRecognition" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/RevenueRecognitionRemaingPerformanceObligationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_156714335EFAD02070D6D337AB9F0AA5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_11CE8AC8C38CBFB34EF2D337AB9FBE08" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_156714335EFAD02070D6D337AB9F0AA5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_11CE8AC8C38CBFB34EF2D337AB9FBE08" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_F32333CEE4F6E311D48BD337AB9F83C4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_11CE8AC8C38CBFB34EF2D337AB9FBE08" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_F32333CEE4F6E311D48BD337AB9F83C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_F1E0952DCD51737A2BFAD337ABAEEC66" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_156714335EFAD02070D6D337AB9F0AA5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_F1E0952DCD51737A2BFAD337ABAEEC66" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_90CE82D3C35E6439D7C8D337ABAE0F40" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_156714335EFAD02070D6D337AB9F0AA5" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_90CE82D3C35E6439D7C8D337ABAE0F40" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/RevenueRecognitionRevenueContractAssetsAndLiabilitiesRollforwardDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/RevenueRecognitionTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ScheduleOfAmountsRecognizedInConsolidatedBalanceSheetsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ScheduleOfDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_C155F6156B5B7071B5994B720B0AC317" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_DebtInstrumentTable_C155F6156B5B7071B5994B720B0AC317" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="itri-20190630.xsd#itri_InterestRateTypeAxis" xlink:label="loc_itri_InterestRateTypeAxis_4255F61ABDCADE7564184B720B0AD398" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_C155F6156B5B7071B5994B720B0AC317" xlink:to="loc_itri_InterestRateTypeAxis_4255F61ABDCADE7564184B720B0AD398" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_InterestRateTypeDomain" xlink:label="loc_itri_InterestRateTypeDomain_DE54D509B8D1FA2C4AB94B720B0A2E23_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_itri_InterestRateTypeAxis_4255F61ABDCADE7564184B720B0AD398" xlink:to="loc_itri_InterestRateTypeDomain_DE54D509B8D1FA2C4AB94B720B0A2E23_default" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_InterestRateTypeDomain" xlink:label="loc_itri_InterestRateTypeDomain_DE54D509B8D1FA2C4AB94B720B0A2E23" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_itri_InterestRateTypeAxis_4255F61ABDCADE7564184B720B0AD398" xlink:to="loc_itri_InterestRateTypeDomain_DE54D509B8D1FA2C4AB94B720B0A2E23" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_EURIBORMember" xlink:label="loc_itri_EURIBORMember_A8E29FA5909C1DDC8E904B720B0A9D05" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_itri_InterestRateTypeDomain_DE54D509B8D1FA2C4AB94B720B0A2E23" xlink:to="loc_itri_EURIBORMember_A8E29FA5909C1DDC8E904B720B0A9D05" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_C7D039FABECF587A782B4B720B0A72D9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_C155F6156B5B7071B5994B720B0AC317" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_C7D039FABECF587A782B4B720B0A72D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4AEDC259781E7BD8E0254B720B0A8528_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_C7D039FABECF587A782B4B720B0A72D9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4AEDC259781E7BD8E0254B720B0A8528_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4AEDC259781E7BD8E0254B720B0A8528" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_C7D039FABECF587A782B4B720B0A72D9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4AEDC259781E7BD8E0254B720B0A8528" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="loc_us-gaap_SecuredDebtMember_14DD15F5215D71A0D3494B720B0A1C8A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4AEDC259781E7BD8E0254B720B0A8528" xlink:to="loc_us-gaap_SecuredDebtMember_14DD15F5215D71A0D3494B720B0A1C8A" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_UsdDenominatedTermLoanMember" xlink:label="loc_itri_UsdDenominatedTermLoanMember_90C36556DAA164F7840C4B720B0A67B8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4AEDC259781E7BD8E0254B720B0A8528" xlink:to="loc_itri_UsdDenominatedTermLoanMember_90C36556DAA164F7840C4B720B0A67B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_245B7092D5B738E55A554B720B0ADC3F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4AEDC259781E7BD8E0254B720B0A8528" xlink:to="loc_us-gaap_LineOfCreditMember_245B7092D5B738E55A554B720B0ADC3F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_BCD39EA5297DFA0678174B720B0AB4F1" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4AEDC259781E7BD8E0254B720B0A8528" xlink:to="loc_us-gaap_SeniorNotesMember_BCD39EA5297DFA0678174B720B0AB4F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LoansPayableToBank" xlink:label="loc_us-gaap_LoansPayableToBank_14FF0368AEDC4E3A87FC4B720B0A7004" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LoansPayableToBank_14FF0368AEDC4E3A87FC4B720B0A7004" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_3756BF48E2C0D22CA9794B720B0AE2D0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LineOfCredit_3756BF48E2C0D22CA9794B720B0AE2D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SeniorNotes" xlink:label="loc_us-gaap_SeniorNotes_DF97BD56F2237A093C644B720B0A964B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_SeniorNotes_DF97BD56F2237A093C644B720B0A964B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_1B8489B5F8ADE7ECF1F64B720B1A1193" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LongTermDebt_1B8489B5F8ADE7ECF1F64B720B1A1193" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_54E40F8D17B4874958A34B720B1AB97F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LongTermDebtCurrent_54E40F8D17B4874958A34B720B1AB97F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredFinanceCostsNoncurrentNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_76A1DC59CD82266BD59E4B720B1A3D7C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_76A1DC59CD82266BD59E4B720B1A3D7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_44EDCB4026ABE06B24C24B720B1A8EC7" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_44EDCB4026ABE06B24C24B720B1A8EC7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_19CD55491EDA5191D11E4B720B1ADB50" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_19CD55491EDA5191D11E4B720B1ADB50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_033AFE3296973B5BF9BC4B720B1A33E1" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_033AFE3296973B5BF9BC4B720B1A33E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_5720226246FC469A20374B720B1A491D" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_5720226246FC469A20374B720B1A491D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_CF8363D03C5D51F9363C4B720B1A3E57" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_CF8363D03C5D51F9363C4B720B1A3E57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_19D212BCA6F4406522F94B720B1A6FD0" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_19D212BCA6F4406522F94B720B1A6FD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_C55D851F140B1C3B83744B720B1A81BA" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40CCAC49A843FFB2A35B4B720B0A93DE" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_C55D851F140B1C3B83744B720B1A81BA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/ScheduleOfFairValuesOfFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8797907E5F62CBF34D694E3CF517D08E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_EAD82397A0ADB4B22EDC4E3CF5133576" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8797907E5F62CBF34D694E3CF517D08E" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_EAD82397A0ADB4B22EDC4E3CF5133576" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_7230AA725BF8B0722B094E3CF5147CED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_EAD82397A0ADB4B22EDC4E3CF5133576" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_7230AA725BF8B0722B094E3CF5147CED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_28378FC0A4A588E90DF04E3CF5146D6A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_7230AA725BF8B0722B094E3CF5147CED" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_28378FC0A4A588E90DF04E3CF5146D6A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_8F5F7AE6F57303C02D3B4E3CF5147BB3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_7230AA725BF8B0722B094E3CF5147CED" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_8F5F7AE6F57303C02D3B4E3CF5147BB3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_28378FC0A4A588E90DF04E3CF5146D6A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_8F5F7AE6F57303C02D3B4E3CF5147BB3" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_28378FC0A4A588E90DF04E3CF5146D6A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_906C7DCD487131B15B074E3CF5150F5B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_8F5F7AE6F57303C02D3B4E3CF5147BB3" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_906C7DCD487131B15B074E3CF5150F5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_9E89652850E1DFB431134E3CF515FA02" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_8F5F7AE6F57303C02D3B4E3CF5147BB3" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_9E89652850E1DFB431134E3CF515FA02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_D8EAC7DC36F851960EC34E3CF515F8A9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_EAD82397A0ADB4B22EDC4E3CF5133576" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_D8EAC7DC36F851960EC34E3CF515F8A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_92BDA92454C6132D73AD4E3CF5157C52_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_D8EAC7DC36F851960EC34E3CF515F8A9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_92BDA92454C6132D73AD4E3CF5157C52_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_92BDA92454C6132D73AD4E3CF5157C52" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_D8EAC7DC36F851960EC34E3CF515F8A9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_92BDA92454C6132D73AD4E3CF5157C52" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignExchangeOptionMember" xlink:label="loc_us-gaap_ForeignExchangeOptionMember_A8CC8EE3FBC866FFA86B4E3CF515607D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_92BDA92454C6132D73AD4E3CF5157C52" xlink:to="loc_us-gaap_ForeignExchangeOptionMember_A8CC8EE3FBC866FFA86B4E3CF515607D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_D918701049899500154B4E3CF5163FFD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_92BDA92454C6132D73AD4E3CF5157C52" xlink:to="loc_us-gaap_InterestRateSwapMember_D918701049899500154B4E3CF5163FFD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestRateCapMember" xlink:label="loc_us-gaap_InterestRateCapMember_CA17E030E9A0FE7DB2F74E3CF516CBCE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_92BDA92454C6132D73AD4E3CF5157C52" xlink:to="loc_us-gaap_InterestRateCapMember_CA17E030E9A0FE7DB2F74E3CF516CBCE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CurrencySwapMember" xlink:label="loc_us-gaap_CurrencySwapMember_2CA9F77D81C7D274CA2B4E3CF5163DC5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_92BDA92454C6132D73AD4E3CF5157C52" xlink:to="loc_us-gaap_CurrencySwapMember_2CA9F77D81C7D274CA2B4E3CF5163DC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_05E41A25E432770E72EE4E3CF516305E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_EAD82397A0ADB4B22EDC4E3CF5133576" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_05E41A25E432770E72EE4E3CF516305E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_63BA079DC72F06654E054E3CF5169AE5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_05E41A25E432770E72EE4E3CF516305E" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_63BA079DC72F06654E054E3CF5169AE5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_63BA079DC72F06654E054E3CF5169AE5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_05E41A25E432770E72EE4E3CF516305E" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_63BA079DC72F06654E054E3CF5169AE5" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_UsdDenominatedTermLoanMember" xlink:label="loc_itri_UsdDenominatedTermLoanMember_B5C043C9EB34FAC591D54E3CF5170B0E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_63BA079DC72F06654E054E3CF5169AE5" xlink:to="loc_itri_UsdDenominatedTermLoanMember_B5C043C9EB34FAC591D54E3CF5170B0E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_15C0CABA13C4C0259FC14E3CF5176A80" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_63BA079DC72F06654E054E3CF5169AE5" xlink:to="loc_us-gaap_LineOfCreditMember_15C0CABA13C4C0259FC14E3CF5176A80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_7D8B04A8E69804E11BF74E3CF5178A1B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8797907E5F62CBF34D694E3CF517D08E" xlink:to="loc_us-gaap_AssetsAbstract_7D8B04A8E69804E11BF74E3CF5178A1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_BB5E8F562D963002FC394E3CF518AF84" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7D8B04A8E69804E11BF74E3CF5178A1B" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_BB5E8F562D963002FC394E3CF518AF84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedCash" xlink:label="loc_us-gaap_RestrictedCash_61B27B767180F08FC68D4E3CF518E940" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7D8B04A8E69804E11BF74E3CF5178A1B" xlink:to="loc_us-gaap_RestrictedCash_61B27B767180F08FC68D4E3CF518E940" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue" xlink:label="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_B8FE674D49E2CCF201434E3CF518EA70" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7D8B04A8E69804E11BF74E3CF5178A1B" xlink:to="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_B8FE674D49E2CCF201434E3CF518EA70" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssetsNoncurrent" xlink:label="loc_us-gaap_DerivativeAssetsNoncurrent_9157D01F8CEDB2B487374E3CF518977C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7D8B04A8E69804E11BF74E3CF5178A1B" xlink:to="loc_us-gaap_DerivativeAssetsNoncurrent_9157D01F8CEDB2B487374E3CF518977C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaap_LiabilitiesAbstract_B2FF77DEF2B9EBDA1EF94E3CF5184BEB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8797907E5F62CBF34D694E3CF517D08E" xlink:to="loc_us-gaap_LiabilitiesAbstract_B2FF77DEF2B9EBDA1EF94E3CF5184BEB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LoansPayableToBank" xlink:label="loc_us-gaap_LoansPayableToBank_DF62B85EFE08B123CFAD4E3CF5191B5B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_B2FF77DEF2B9EBDA1EF94E3CF5184BEB" xlink:to="loc_us-gaap_LoansPayableToBank_DF62B85EFE08B123CFAD4E3CF5191B5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaap_LongTermDebtFairValue_3E18A6BF635AA6DFB9C64E3CF5194DB3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_B2FF77DEF2B9EBDA1EF94E3CF5184BEB" xlink:to="loc_us-gaap_LongTermDebtFairValue_3E18A6BF635AA6DFB9C64E3CF5194DB3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_98AF2CD9F910B1FDC51F4E3CF519FF64" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_B2FF77DEF2B9EBDA1EF94E3CF5184BEB" xlink:to="loc_us-gaap_LineOfCredit_98AF2CD9F910B1FDC51F4E3CF519FF64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_82CBCD6D7C7993D6B5674E3CF5194378" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_B2FF77DEF2B9EBDA1EF94E3CF5184BEB" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_82CBCD6D7C7993D6B5674E3CF5194378" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SeniorNotes" xlink:label="loc_us-gaap_SeniorNotes_CEC4DC20EFC827993EEB4E3CF51A6F4A" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_B2FF77DEF2B9EBDA1EF94E3CF5184BEB" xlink:to="loc_us-gaap_SeniorNotes_CEC4DC20EFC827993EEB4E3CF51A6F4A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue" xlink:label="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_E2CF34243AD8266B33144E3CF51AD423" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_B2FF77DEF2B9EBDA1EF94E3CF5184BEB" xlink:to="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_E2CF34243AD8266B33144E3CF51AD423" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/ScheduleOfGoodwillAllocatedToReportingSegmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_4E8FE93546C8686EA3B7D337AAE69F14" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_DDDB61B8AA9950B2FBD3D337AAE66158" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_4E8FE93546C8686EA3B7D337AAE69F14" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_DDDB61B8AA9950B2FBD3D337AAE66158" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1CD1BF81AFCD06A9140FD337AAE6F125" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_DDDB61B8AA9950B2FBD3D337AAE66158" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1CD1BF81AFCD06A9140FD337AAE6F125" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_8ED9162E8C4D5922CCC3D337AAE6A089_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1CD1BF81AFCD06A9140FD337AAE6F125" xlink:to="loc_us-gaap_SegmentDomain_8ED9162E8C4D5922CCC3D337AAE6A089_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_8ED9162E8C4D5922CCC3D337AAE6A089" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1CD1BF81AFCD06A9140FD337AAE6F125" xlink:to="loc_us-gaap_SegmentDomain_8ED9162E8C4D5922CCC3D337AAE6A089" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_DeviceSolutionsMember" xlink:label="loc_itri_DeviceSolutionsMember_98BAA8703B0BC4A8E404D337AAE6FA62" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8ED9162E8C4D5922CCC3D337AAE6A089" xlink:to="loc_itri_DeviceSolutionsMember_98BAA8703B0BC4A8E404D337AAE6FA62" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_NetworkedSolutionsSegmentMember" xlink:label="loc_itri_NetworkedSolutionsSegmentMember_F3678D39573C13F771A7D337AAE623C3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8ED9162E8C4D5922CCC3D337AAE6A089" xlink:to="loc_itri_NetworkedSolutionsSegmentMember_F3678D39573C13F771A7D337AAE623C3" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_OutcomesSegmentMember" xlink:label="loc_itri_OutcomesSegmentMember_DDC3667FA017A29C08D3D337AAE61321" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8ED9162E8C4D5922CCC3D337AAE6A089" xlink:to="loc_itri_OutcomesSegmentMember_DDC3667FA017A29C08D3D337AAE61321" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_E7D128C4847196D9C2D9D337AAE6CC13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_4E8FE93546C8686EA3B7D337AAE69F14" xlink:to="loc_us-gaap_GoodwillRollForward_E7D128C4847196D9C2D9D337AAE6CC13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_588DCAE47DC89ECF5072D337AAE6C846" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_E7D128C4847196D9C2D9D337AAE6CC13" xlink:to="loc_us-gaap_Goodwill_588DCAE47DC89ECF5072D337AAE6C846" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_1E62D3F9C8FC0F122CA5D337AAE6407B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_E7D128C4847196D9C2D9D337AAE6CC13" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_1E62D3F9C8FC0F122CA5D337AAE6407B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_D6BA71AF0DCF97269334D337AAE67128" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_E7D128C4847196D9C2D9D337AAE6CC13" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_D6BA71AF0DCF97269334D337AAE67128" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/ScheduleOfNetPeriodicPensionBenefitCostsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/SegmentInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/SegmentInformationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_EA76EE2E0B058F6762A349582D4F7FEE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_199B8415F7E3D1566CFE49582D4C11EF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_EA76EE2E0B058F6762A349582D4F7FEE" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_199B8415F7E3D1566CFE49582D4C11EF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_10FC4F5F2C859A48057A49582D4CC533" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_199B8415F7E3D1566CFE49582D4C11EF" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_10FC4F5F2C859A48057A49582D4CC533" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_D96A29CB17FA8C93B2FB49582D4DB375_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_10FC4F5F2C859A48057A49582D4CC533" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_D96A29CB17FA8C93B2FB49582D4DB375_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_D96A29CB17FA8C93B2FB49582D4DB375" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_10FC4F5F2C859A48057A49582D4CC533" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_D96A29CB17FA8C93B2FB49582D4DB375" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SalesMember" xlink:label="loc_us-gaap_SalesMember_6BA7B401C26EE750D8A949582D4D5004" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_D96A29CB17FA8C93B2FB49582D4DB375" xlink:to="loc_us-gaap_SalesMember_6BA7B401C26EE750D8A949582D4D5004" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_E19F55520485D606677C49582D4D93D5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_199B8415F7E3D1566CFE49582D4C11EF" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_E19F55520485D606677C49582D4D93D5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_C0C3AEF8D22185196E1F49582D4E88FD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_E19F55520485D606677C49582D4D93D5" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_C0C3AEF8D22185196E1F49582D4E88FD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_C0C3AEF8D22185196E1F49582D4E88FD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_E19F55520485D606677C49582D4D93D5" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_C0C3AEF8D22185196E1F49582D4E88FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_FD8E1442A7E5525F07B149582D4E25B0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_199B8415F7E3D1566CFE49582D4C11EF" xlink:to="loc_srt_ConsolidationItemsAxis_FD8E1442A7E5525F07B149582D4E25B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_3F815994FC32ABA255D049582D4EFE99_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_FD8E1442A7E5525F07B149582D4E25B0" xlink:to="loc_srt_ConsolidationItemsDomain_3F815994FC32ABA255D049582D4EFE99_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_3F815994FC32ABA255D049582D4EFE99" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_FD8E1442A7E5525F07B149582D4E25B0" xlink:to="loc_srt_ConsolidationItemsDomain_3F815994FC32ABA255D049582D4EFE99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MajorCustomersAxis" xlink:label="loc_srt_MajorCustomersAxis_C898C4234F5AB5B779ED49582D4EBE29" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_199B8415F7E3D1566CFE49582D4C11EF" xlink:to="loc_srt_MajorCustomersAxis_C898C4234F5AB5B779ED49582D4EBE29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srt_NameOfMajorCustomerDomain_6E0BC7324CA1544782A449582D4F59AF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_C898C4234F5AB5B779ED49582D4EBE29" xlink:to="loc_srt_NameOfMajorCustomerDomain_6E0BC7324CA1544782A449582D4F59AF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srt_NameOfMajorCustomerDomain_6E0BC7324CA1544782A449582D4F59AF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_C898C4234F5AB5B779ED49582D4EBE29" xlink:to="loc_srt_NameOfMajorCustomerDomain_6E0BC7324CA1544782A449582D4F59AF" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_CustomerAMember" xlink:label="loc_itri_CustomerAMember_E52263CE4F05AD6348E449582D4F922A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_6E0BC7324CA1544782A449582D4F59AF" xlink:to="loc_itri_CustomerAMember_E52263CE4F05AD6348E449582D4F922A" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_ThresholdforReportingCustomerConcentrationMember" xlink:label="loc_itri_ThresholdforReportingCustomerConcentrationMember_B7BCC71B264C76ACE3F649582D4F730B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_6E0BC7324CA1544782A449582D4F59AF" xlink:to="loc_itri_ThresholdforReportingCustomerConcentrationMember_B7BCC71B264C76ACE3F649582D4F730B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_F200707B70F8EC03F57C49582D4FBA49" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_199B8415F7E3D1566CFE49582D4C11EF" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_F200707B70F8EC03F57C49582D4FBA49" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_EA44D0BEF04F13E1F55749582D4F80F8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_F200707B70F8EC03F57C49582D4FBA49" xlink:to="loc_us-gaap_SegmentDomain_EA44D0BEF04F13E1F55749582D4F80F8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_EA44D0BEF04F13E1F55749582D4F80F8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_F200707B70F8EC03F57C49582D4FBA49" xlink:to="loc_us-gaap_SegmentDomain_EA44D0BEF04F13E1F55749582D4F80F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsAxis" xlink:label="loc_us-gaap_SubsegmentsAxis_BE1D678E600661DC7D7449582D4FB601" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_199B8415F7E3D1566CFE49582D4C11EF" xlink:to="loc_us-gaap_SubsegmentsAxis_BE1D678E600661DC7D7449582D4FB601" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsDomain" xlink:label="loc_us-gaap_SubsegmentsDomain_EF9C430E046FDADC9DF749582D4F0E42_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_BE1D678E600661DC7D7449582D4FB601" xlink:to="loc_us-gaap_SubsegmentsDomain_EF9C430E046FDADC9DF749582D4F0E42_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsDomain" xlink:label="loc_us-gaap_SubsegmentsDomain_EF9C430E046FDADC9DF749582D4F0E42" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_BE1D678E600661DC7D7449582D4FB601" xlink:to="loc_us-gaap_SubsegmentsDomain_EF9C430E046FDADC9DF749582D4F0E42" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsConsolidationItemsAxis" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsAxis_17A0A9FFE4F63722363449582D4F41DF" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_199B8415F7E3D1566CFE49582D4C11EF" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsAxis_17A0A9FFE4F63722363449582D4F41DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsConsolidationItemsDomain" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsDomain_0E1A45BF05F9C39CC3DD49582D4F653A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsAxis_17A0A9FFE4F63722363449582D4F41DF" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsDomain_0E1A45BF05F9C39CC3DD49582D4F653A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsegmentsConsolidationItemsDomain" xlink:label="loc_us-gaap_SubsegmentsConsolidationItemsDomain_0E1A45BF05F9C39CC3DD49582D4F653A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsConsolidationItemsAxis_17A0A9FFE4F63722363449582D4F41DF" xlink:to="loc_us-gaap_SubsegmentsConsolidationItemsDomain_0E1A45BF05F9C39CC3DD49582D4F653A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_2556A36A0B478CBCED1649582D4FF301" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_EA76EE2E0B058F6762A349582D4F7FEE" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_2556A36A0B478CBCED1649582D4FF301" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/SegmentInformationRevenuesByRegionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_BDC27C1506355ED54F09D337AB69A15C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_CB066F4A4D010C1C7DCDD337AB6962A3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_BDC27C1506355ED54F09D337AB69A15C" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_CB066F4A4D010C1C7DCDD337AB6962A3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_FC8AA5D65D3CE4ED30D8D337AB695BFE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_CB066F4A4D010C1C7DCDD337AB6962A3" xlink:to="loc_srt_StatementGeographicalAxis_FC8AA5D65D3CE4ED30D8D337AB695BFE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_8D3215B83284F0E5052ED337AB691E6D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_FC8AA5D65D3CE4ED30D8D337AB695BFE" xlink:to="loc_srt_SegmentGeographicalDomain_8D3215B83284F0E5052ED337AB691E6D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_8D3215B83284F0E5052ED337AB691E6D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_FC8AA5D65D3CE4ED30D8D337AB695BFE" xlink:to="loc_srt_SegmentGeographicalDomain_8D3215B83284F0E5052ED337AB691E6D" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_UnitedStatesAndCanadaMember" xlink:label="loc_itri_UnitedStatesAndCanadaMember_3122B58C37D91E84CBCFD337AB693935" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8D3215B83284F0E5052ED337AB691E6D" xlink:to="loc_itri_UnitedStatesAndCanadaMember_3122B58C37D91E84CBCFD337AB693935" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EMEAMember" xlink:label="loc_us-gaap_EMEAMember_0F9DA4F7E8863868DCE1D337AB699D7A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8D3215B83284F0E5052ED337AB691E6D" xlink:to="loc_us-gaap_EMEAMember_0F9DA4F7E8863868DCE1D337AB699D7A" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_OtherCountriesMember" xlink:label="loc_itri_OtherCountriesMember_E91D76001B409B1A1E6CD337AB69D644" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8D3215B83284F0E5052ED337AB691E6D" xlink:to="loc_itri_OtherCountriesMember_E91D76001B409B1A1E6CD337AB69D644" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_3E5A6E9F440D23146A05D337AB6960DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_BDC27C1506355ED54F09D337AB69A15C" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_3E5A6E9F440D23146A05D337AB6960DB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ShareholdersEquity" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ShareholdersEquityAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B9EFEFD3629D2B00E1F44F3F5FE8F1B5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_C009E2395AE6ACD124544F3F5FE62DD8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B9EFEFD3629D2B00E1F44F3F5FE8F1B5" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_C009E2395AE6ACD124544F3F5FE62DD8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_79FDB947A7A870AFE3A64F3F5FE6C5DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_C009E2395AE6ACD124544F3F5FE62DD8" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_79FDB947A7A870AFE3A64F3F5FE6C5DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_F783580949063F46CC8D4F3F5FE70CB1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_79FDB947A7A870AFE3A64F3F5FE6C5DF" xlink:to="loc_us-gaap_EquityComponentDomain_F783580949063F46CC8D4F3F5FE70CB1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_F783580949063F46CC8D4F3F5FE70CB1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_79FDB947A7A870AFE3A64F3F5FE6C5DF" xlink:to="loc_us-gaap_EquityComponentDomain_F783580949063F46CC8D4F3F5FE70CB1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_982F45C4A278F87285624F3F5FE73C6E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_F783580949063F46CC8D4F3F5FE70CB1" xlink:to="loc_us-gaap_ParentMember_982F45C4A278F87285624F3F5FE73C6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_9F7914A035C1883A0DDD4F3F5FE71A2A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_982F45C4A278F87285624F3F5FE73C6E" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_9F7914A035C1883A0DDD4F3F5FE71A2A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_7C84077DF51FFF8C37E04F3F5FE7B0DB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_982F45C4A278F87285624F3F5FE73C6E" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_7C84077DF51FFF8C37E04F3F5FE7B0DB" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember" xlink:label="loc_itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember_323197BB91BAFA1C5E964F3F5FE80BB7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_982F45C4A278F87285624F3F5FE73C6E" xlink:to="loc_itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember_323197BB91BAFA1C5E964F3F5FE80BB7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_47D60177E2E93B47E58D4F3F5FE81A4D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_982F45C4A278F87285624F3F5FE73C6E" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_47D60177E2E93B47E58D4F3F5FE81A4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_E04459BCD8ECFDA030CA4F3F5FE8DEB0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B9EFEFD3629D2B00E1F44F3F5FE8F1B5" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_E04459BCD8ECFDA030CA4F3F5FE8DEB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_08E781D88BE7C90D61B84F3F5FE8C8D7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B9EFEFD3629D2B00E1F44F3F5FE8F1B5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_08E781D88BE7C90D61B84F3F5FE8C8D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_8A0570B25B17CD8DEDFD4F3F5FE9BDB4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B9EFEFD3629D2B00E1F44F3F5FE8F1B5" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_8A0570B25B17CD8DEDFD4F3F5FE9BDB4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_D3AE4BC4DEE1CFF39CB84F3F5FE990CF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B9EFEFD3629D2B00E1F44F3F5FE8F1B5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_D3AE4BC4DEE1CFF39CB84F3F5FE990CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_696072BB7AE8084205CE4F3F5FE938C8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B9EFEFD3629D2B00E1F44F3F5FE8F1B5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_696072BB7AE8084205CE4F3F5FE938C8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/ShareholdersEquityOtherComprehensiveIncomeLossDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ShareholdersEquityPreferredStockDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/ShareholdersEquityStockRepurchaseAuthorizationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_B066FF2A5C970EE38CEE49CFDEF074F5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_9DD6706C5A0F44AAC8C449CFDEEF2B59" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_B066FF2A5C970EE38CEE49CFDEF074F5" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_9DD6706C5A0F44AAC8C449CFDEEF2B59" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_2FF30A9362731A6EF52549CFDEEF0296" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_9DD6706C5A0F44AAC8C449CFDEEF2B59" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_2FF30A9362731A6EF52549CFDEEF0296" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_7694A9FC0E008634CE2149CFDEF04D6D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_2FF30A9362731A6EF52549CFDEEF0296" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_7694A9FC0E008634CE2149CFDEF04D6D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_7694A9FC0E008634CE2149CFDEF04D6D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_2FF30A9362731A6EF52549CFDEEF0296" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_7694A9FC0E008634CE2149CFDEF04D6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_82AA1CC6D32D216A236049CFDEF0266E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_7694A9FC0E008634CE2149CFDEF04D6D" xlink:to="loc_us-gaap_SubsequentEventMember_82AA1CC6D32D216A236049CFDEF0266E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_A59781A490549BDAAC8D49CFDEF195A3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_B066FF2A5C970EE38CEE49CFDEF074F5" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_A59781A490549BDAAC8D49CFDEF195A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_C58855BE1076C5616F5C49CFDEF67FAD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_B066FF2A5C970EE38CEE49CFDEF074F5" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_C58855BE1076C5616F5C49CFDEF67FAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_813C52A8D40EE547EC7249CFDEF6197B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_B066FF2A5C970EE38CEE49CFDEF074F5" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_813C52A8D40EE547EC7249CFDEF6197B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_6350D6678308F24C9B6D49CFDEF75C7F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_B066FF2A5C970EE38CEE49CFDEF074F5" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_6350D6678308F24C9B6D49CFDEF75C7F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_47BD7310CE23C1178E3349CFDEF70A89" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_B066FF2A5C970EE38CEE49CFDEF074F5" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_47BD7310CE23C1178E3349CFDEF70A89" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/ShareholdersEquityTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationExpenseAndRelatedTaxBenefitDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8BBB8B24C80BF0C29F5DD337AB8F3BDE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_49B3C7699EF15235C270D337AB8F7C9F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8BBB8B24C80BF0C29F5DD337AB8F3BDE" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_49B3C7699EF15235C270D337AB8F7C9F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_17C6C4E60C38270CD484D337AB8F9FAB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_49B3C7699EF15235C270D337AB8F7C9F" xlink:to="loc_us-gaap_PlanNameAxis_17C6C4E60C38270CD484D337AB8F9FAB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_0C9C1425C4D27F3ADE90D337AB8F9D36_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_17C6C4E60C38270CD484D337AB8F9FAB" xlink:to="loc_us-gaap_PlanNameDomain_0C9C1425C4D27F3ADE90D337AB8F9D36_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_0C9C1425C4D27F3ADE90D337AB8F9D36" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_17C6C4E60C38270CD484D337AB8F9FAB" xlink:to="loc_us-gaap_PlanNameDomain_0C9C1425C4D27F3ADE90D337AB8F9D36" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_StockIncentivePlanMember" xlink:label="loc_itri_StockIncentivePlanMember_67875B8347FCD45F808BD337AB8FB755" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_0C9C1425C4D27F3ADE90D337AB8F9D36" xlink:to="loc_itri_StockIncentivePlanMember_67875B8347FCD45F808BD337AB8FB755" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_EBD3C801988F104DB57CD337AB8F2028" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_49B3C7699EF15235C270D337AB8F7C9F" xlink:to="loc_us-gaap_AwardTypeAxis_EBD3C801988F104DB57CD337AB8F2028" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_851CC231387499682A6AD337AB8F1395_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_EBD3C801988F104DB57CD337AB8F2028" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_851CC231387499682A6AD337AB8F1395_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_851CC231387499682A6AD337AB8F1395" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_EBD3C801988F104DB57CD337AB8F2028" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_851CC231387499682A6AD337AB8F1395" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PhantomShareUnitsPSUsMember" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_727EC82ED7E32ABE3AA1D337AB8FD1DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_851CC231387499682A6AD337AB8F1395" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_727EC82ED7E32ABE3AA1D337AB8FD1DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockOptionPlanExpense" xlink:label="loc_us-gaap_StockOptionPlanExpense_545F15030455C263EA2CD337AB8F7164" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8BBB8B24C80BF0C29F5DD337AB8F3BDE" xlink:to="loc_us-gaap_StockOptionPlanExpense_545F15030455C263EA2CD337AB8F7164" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockExpense" xlink:label="loc_us-gaap_RestrictedStockExpense_0EB6749D613753FC997CD337AB8F794C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8BBB8B24C80BF0C29F5DD337AB8F3BDE" xlink:to="loc_us-gaap_RestrictedStockExpense_0EB6749D613753FC997CD337AB8F794C" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_UnrestrictedStockAwardsCompensationExpense" xlink:label="loc_itri_UnrestrictedStockAwardsCompensationExpense_68D1DC0DD9EDFC6E05C8D337AB8F259A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8BBB8B24C80BF0C29F5DD337AB8F3BDE" xlink:to="loc_itri_UnrestrictedStockAwardsCompensationExpense_68D1DC0DD9EDFC6E05C8D337AB8F259A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_D5D6FD53E9CB7DB6F3E3D337AB8F2D9C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8BBB8B24C80BF0C29F5DD337AB8F3BDE" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_D5D6FD53E9CB7DB6F3E3D337AB8F2D9C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_9A4EEAC39FCFF1AA496CD337AB8FBF1E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8BBB8B24C80BF0C29F5DD337AB8F3BDE" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_9A4EEAC39FCFF1AA496CD337AB8FBF1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2CB68D952F2644D8255AD337AB8F55A4" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8BBB8B24C80BF0C29F5DD337AB8F3BDE" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2CB68D952F2644D8255AD337AB8F55A4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationLongTermPerformanceRestrictedStockUnitAwardMonteCarloPricingModelAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D5165D402D67F37C65FDD337AC12FD67" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CC863FBCA9620CD28EFCD337AC124661" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D5165D402D67F37C65FDD337AC12FD67" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CC863FBCA9620CD28EFCD337AC124661" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_8DCF5128488BFE324D48D337AC12CBFA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CC863FBCA9620CD28EFCD337AC124661" xlink:to="loc_us-gaap_AwardTypeAxis_8DCF5128488BFE324D48D337AC12CBFA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3A704E69A647FEA7FF37D337AC12EB81_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_8DCF5128488BFE324D48D337AC12CBFA" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3A704E69A647FEA7FF37D337AC12EB81_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3A704E69A647FEA7FF37D337AC12EB81" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_8DCF5128488BFE324D48D337AC12CBFA" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3A704E69A647FEA7FF37D337AC12EB81" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_1BEB0C196FF1D8E4DFE8D337AC128F07" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3A704E69A647FEA7FF37D337AC12EB81" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_1BEB0C196FF1D8E4DFE8D337AC128F07" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_5B424B2B78BB00508B91D337AC12A78D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CC863FBCA9620CD28EFCD337AC124661" xlink:to="loc_us-gaap_PlanNameAxis_5B424B2B78BB00508B91D337AC12A78D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_15E59DD0028316B06E06D337AC1254A0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_5B424B2B78BB00508B91D337AC12A78D" xlink:to="loc_us-gaap_PlanNameDomain_15E59DD0028316B06E06D337AC1254A0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_15E59DD0028316B06E06D337AC1254A0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_5B424B2B78BB00508B91D337AC12A78D" xlink:to="loc_us-gaap_PlanNameDomain_15E59DD0028316B06E06D337AC1254A0" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_LongTermPerformanceRestrictedStockAwardMember" xlink:label="loc_itri_LongTermPerformanceRestrictedStockAwardMember_F24FBFE2F0346B37ECC1D337AC1205F9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_15E59DD0028316B06E06D337AC1254A0" xlink:to="loc_itri_LongTermPerformanceRestrictedStockAwardMember_F24FBFE2F0346B37ECC1D337AC1205F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_410DCB1820BACF315319D337AC127CAC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D5165D402D67F37C65FDD337AC12FD67" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_410DCB1820BACF315319D337AC127CAC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_F868ECAA735CC2B26AC0D337AC125829" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D5165D402D67F37C65FDD337AC12FD67" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_F868ECAA735CC2B26AC0D337AC125829" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_34BB0AD32A3719AF35ECD337AC12BC18" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D5165D402D67F37C65FDD337AC12FD67" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_34BB0AD32A3719AF35ECD337AC12BC18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1CA558179807DFC91D1BD337AC12FAB4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_D5165D402D67F37C65FDD337AC12FD67" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1CA558179807DFC91D1BD337AC12FAB4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_A3D16E999A144071F846D337ACD6ED41" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_8445BB3A69D85D6B7178D337ACD67116" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_A3D16E999A144071F846D337ACD6ED41" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_8445BB3A69D85D6B7178D337ACD67116" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_AC66DED49F8A9A873787D337ACD6A893" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_8445BB3A69D85D6B7178D337ACD67116" xlink:to="loc_us-gaap_PlanNameAxis_AC66DED49F8A9A873787D337ACD6A893" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_1048AADD4E52990A268AD337ACD61E5C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_AC66DED49F8A9A873787D337ACD6A893" xlink:to="loc_us-gaap_PlanNameDomain_1048AADD4E52990A268AD337ACD61E5C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_1048AADD4E52990A268AD337ACD61E5C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_AC66DED49F8A9A873787D337ACD6A893" xlink:to="loc_us-gaap_PlanNameDomain_1048AADD4E52990A268AD337ACD61E5C" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_LongTermPerformanceRestrictedStockAwardMember" xlink:label="loc_itri_LongTermPerformanceRestrictedStockAwardMember_A8DCC71580723C490DC2D337ACD61228" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_1048AADD4E52990A268AD337ACD61E5C" xlink:to="loc_itri_LongTermPerformanceRestrictedStockAwardMember_A8DCC71580723C490DC2D337ACD61228" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_StockIncentivePlanMember" xlink:label="loc_itri_StockIncentivePlanMember_6953860AE280BE26A145D337ACD6E257" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_1048AADD4E52990A268AD337ACD61E5C" xlink:to="loc_itri_StockIncentivePlanMember_6953860AE280BE26A145D337ACD6E257" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SSNIPlanMember" xlink:label="loc_itri_SSNIPlanMember_AED50F113985E74E4C18D337ACD6A2FF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_1048AADD4E52990A268AD337ACD61E5C" xlink:to="loc_itri_SSNIPlanMember_AED50F113985E74E4C18D337ACD6A2FF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_774F1210C5F79A49DDDCD337ACD610AF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_8445BB3A69D85D6B7178D337ACD67116" xlink:to="loc_us-gaap_AwardTypeAxis_774F1210C5F79A49DDDCD337ACD610AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E5432F1B5AE5C523748BD337ACD69B68_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_774F1210C5F79A49DDDCD337ACD610AF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E5432F1B5AE5C523748BD337ACD69B68_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E5432F1B5AE5C523748BD337ACD69B68" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_774F1210C5F79A49DDDCD337ACD610AF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E5432F1B5AE5C523748BD337ACD69B68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_5DE2EB704380CBEF5562D337ACD62904" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E5432F1B5AE5C523748BD337ACD69B68" xlink:to="loc_us-gaap_EmployeeStockOptionMember_5DE2EB704380CBEF5562D337ACD62904" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_LongTermPerformanceRestrictedStockAwardMember" xlink:label="loc_itri_LongTermPerformanceRestrictedStockAwardMember_1B70BA3CFD8383CB2BF9D337ACD62072" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E5432F1B5AE5C523748BD337ACD69B68" xlink:to="loc_itri_LongTermPerformanceRestrictedStockAwardMember_1B70BA3CFD8383CB2BF9D337ACD62072" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_C5CF4CB28C7CBEEDC6C8D337ACD6BACE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E5432F1B5AE5C523748BD337ACD69B68" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_C5CF4CB28C7CBEEDC6C8D337ACD6BACE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PhantomShareUnitsPSUsMember" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_7CD2D22F0D2F80D75BEBD337ACD669EA" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E5432F1B5AE5C523748BD337ACD69B68" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_7CD2D22F0D2F80D75BEBD337ACD669EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_92CFFE276EB91C08F7B3D337ACD6E07C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E5432F1B5AE5C523748BD337ACD69B68" xlink:to="loc_us-gaap_EmployeeStockMember_92CFFE276EB91C08F7B3D337ACD6E07C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_3F28ADA1875FF0F71D66D337ACD67121" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_A3D16E999A144071F846D337ACD6ED41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_3F28ADA1875FF0F71D66D337ACD67121" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_67025B7767C456829741D337ACD62661" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_A3D16E999A144071F846D337ACD6ED41" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_67025B7767C456829741D337ACD62661" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_Authorizedsharereservereductioninstockoptionsorshareappreciationrightsavailableforissueconversionratio" xlink:label="loc_itri_Authorizedsharereservereductioninstockoptionsorshareappreciationrightsavailableforissueconversionratio_4C1110DD3D08D856DF24D337ACD675F9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_A3D16E999A144071F846D337ACD6ED41" xlink:to="loc_itri_Authorizedsharereservereductioninstockoptionsorshareappreciationrightsavailableforissueconversionratio_4C1110DD3D08D856DF24D337ACD675F9" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_Authorizedsharereservereductioninawardsotherthanstockoptionsorshareappreciationrightsavailableforissueconversionratio" xlink:label="loc_itri_Authorizedsharereservereductioninawardsotherthanstockoptionsorshareappreciationrightsavailableforissueconversionratio_104E519E4F8AC510FC64D337ACD6EF1F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_A3D16E999A144071F846D337ACD6ED41" xlink:to="loc_itri_Authorizedsharereservereductioninawardsotherthanstockoptionsorshareappreciationrightsavailableforissueconversionratio_104E519E4F8AC510FC64D337ACD6EF1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_1278EADB34AC4EFECD1BD337ACD63199" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_A3D16E999A144071F846D337ACD6ED41" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_1278EADB34AC4EFECD1BD337ACD63199" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_5FC0B4FC3D5011D6BC04D337ACD6B9E7" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_A3D16E999A144071F846D337ACD6ED41" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_5FC0B4FC3D5011D6BC04D337ACD6B9E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent" xlink:label="loc_us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent_FD9161C3D09747F42930D337ACD69598" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_A3D16E999A144071F846D337ACD6ED41" xlink:to="loc_us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent_FD9161C3D09747F42930D337ACD69598" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationPhantomStockUnitsSummaryDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9888C2AC1871741BA64ED337AD1142B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9888C2AC1871741BA64ED337AD1142B7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_A30FF46F98935C90C12DD337AD11D056" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9888C2AC1871741BA64ED337AD1142B7" xlink:to="loc_us-gaap_AwardTypeAxis_A30FF46F98935C90C12DD337AD11D056" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_326CE093EA2072467BA9D337AD110F26_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_A30FF46F98935C90C12DD337AD11D056" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_326CE093EA2072467BA9D337AD110F26_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_326CE093EA2072467BA9D337AD110F26" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_A30FF46F98935C90C12DD337AD11D056" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_326CE093EA2072467BA9D337AD110F26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PhantomShareUnitsPSUsMember" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_339E6DC85085A4B06EF5D337AD11AC16" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_326CE093EA2072467BA9D337AD110F26" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_339E6DC85085A4B06EF5D337AD11AC16" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_061098B1677486A26DF6D337AD11FB4F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9888C2AC1871741BA64ED337AD1142B7" xlink:to="loc_us-gaap_VestingAxis_061098B1677486A26DF6D337AD11FB4F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_D779768E842EB4E5925AD337AD114871_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_061098B1677486A26DF6D337AD11FB4F" xlink:to="loc_us-gaap_VestingDomain_D779768E842EB4E5925AD337AD114871_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_D779768E842EB4E5925AD337AD114871" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_061098B1677486A26DF6D337AD11FB4F" xlink:to="loc_us-gaap_VestingDomain_D779768E842EB4E5925AD337AD114871" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_ExpectedToVestMember" xlink:label="loc_itri_ExpectedToVestMember_3E2E25991A434C917A01D337AD117D2C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_D779768E842EB4E5925AD337AD114871" xlink:to="loc_itri_ExpectedToVestMember_3E2E25991A434C917A01D337AD117D2C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_72771FBB984D18DBDB17D337AD11F575" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_72771FBB984D18DBDB17D337AD11F575" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_D75E61DFBA4C31CF2630D337AD1141DD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_D75E61DFBA4C31CF2630D337AD1141DD" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisition" xlink:label="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisition_6396CA750F99235606B8D337AD11506A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisition_6396CA750F99235606B8D337AD11506A" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisitionWeightedAverageGrantDateFairValue" xlink:label="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisitionWeightedAverageGrantDateFairValue_A6D24552B19B87D57D4CD337AD114318" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisitionWeightedAverageGrantDateFairValue_A6D24552B19B87D57D4CD337AD114318" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_AE65607CADEFA1888CEAD337AD21A5CC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_AE65607CADEFA1888CEAD337AD21A5CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_DC5D4456FDFE96301F68D337AD2199C6" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_DC5D4456FDFE96301F68D337AD2199C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_784B737D61FEA5EEC01DD337AD216D5D" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_784B737D61FEA5EEC01DD337AD216D5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_C35D28DD80E23CCE5A79D337AD21F51F" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_C35D28DD80E23CCE5A79D337AD21F51F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_4D7592B1CBCF1A5F39FCD337AD216601" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_4D7592B1CBCF1A5F39FCD337AD216601" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_C4430E9B294154A68620D337AD21F4C2" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_379B1492C9543142C2EED337AD1107DC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_C4430E9B294154A68620D337AD21F4C2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationRestrictedStockUnitsSummaryDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D27592B8CC1ACC8787B5D337ABBEF30E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D27592B8CC1ACC8787B5D337ABBEF30E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_C2C29754F24C45C1F331D337ABBE6E55" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D27592B8CC1ACC8787B5D337ABBEF30E" xlink:to="loc_us-gaap_PlanNameAxis_C2C29754F24C45C1F331D337ABBE6E55" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_FC1B1757F3AC6751BC35D337ABBE1641_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_C2C29754F24C45C1F331D337ABBE6E55" xlink:to="loc_us-gaap_PlanNameDomain_FC1B1757F3AC6751BC35D337ABBE1641_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_FC1B1757F3AC6751BC35D337ABBE1641" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_C2C29754F24C45C1F331D337ABBE6E55" xlink:to="loc_us-gaap_PlanNameDomain_FC1B1757F3AC6751BC35D337ABBE1641" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_LongTermPerformanceRestrictedStockAwardMember" xlink:label="loc_itri_LongTermPerformanceRestrictedStockAwardMember_D9A9F71B7E2370B18424D337ABBEEEBD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_FC1B1757F3AC6751BC35D337ABBE1641" xlink:to="loc_itri_LongTermPerformanceRestrictedStockAwardMember_D9A9F71B7E2370B18424D337ABBEEEBD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_C580CA7D0AEEF10DC4F1D337ABBE9108" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D27592B8CC1ACC8787B5D337ABBEF30E" xlink:to="loc_us-gaap_VestingAxis_C580CA7D0AEEF10DC4F1D337ABBE9108" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_B2B6367686E2173D915BD337ABBE4A6B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_C580CA7D0AEEF10DC4F1D337ABBE9108" xlink:to="loc_us-gaap_VestingDomain_B2B6367686E2173D915BD337ABBE4A6B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_B2B6367686E2173D915BD337ABBE4A6B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_C580CA7D0AEEF10DC4F1D337ABBE9108" xlink:to="loc_us-gaap_VestingDomain_B2B6367686E2173D915BD337ABBE4A6B" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_VestedAndReleasedMember" xlink:label="loc_itri_VestedAndReleasedMember_AAE9FCF2D8825F2BBCC9D337ABBE697E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_B2B6367686E2173D915BD337ABBE4A6B" xlink:to="loc_itri_VestedAndReleasedMember_AAE9FCF2D8825F2BBCC9D337ABBE697E" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_VestedButNotReleasedMember" xlink:label="loc_itri_VestedButNotReleasedMember_94E6CA9A1D852124E0D8D337ABBEE7E8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_B2B6367686E2173D915BD337ABBE4A6B" xlink:to="loc_itri_VestedButNotReleasedMember_94E6CA9A1D852124E0D8D337ABBEE7E8" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_ExpectedToVestMember" xlink:label="loc_itri_ExpectedToVestMember_2C8C523430E2CA080B5ED337ABBE3DC6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_B2B6367686E2173D915BD337ABBE4A6B" xlink:to="loc_itri_ExpectedToVestMember_2C8C523430E2CA080B5ED337ABBE3DC6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_C93E8F7888489DEEE2BED337ABBE9013" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D27592B8CC1ACC8787B5D337ABBEF30E" xlink:to="loc_us-gaap_AwardTypeAxis_C93E8F7888489DEEE2BED337ABBE9013" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D3A60C9B110F29C37654D337ABBEA0FD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_C93E8F7888489DEEE2BED337ABBE9013" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D3A60C9B110F29C37654D337ABBEA0FD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D3A60C9B110F29C37654D337ABBEA0FD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_C93E8F7888489DEEE2BED337ABBE9013" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D3A60C9B110F29C37654D337ABBEA0FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_C72F6D765B980E45C812D337ABBE79B5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_D3A60C9B110F29C37654D337ABBEA0FD" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_C72F6D765B980E45C812D337ABBE79B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_6B524ABA7B33B5B32C47D337ABBE3042" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_6B524ABA7B33B5B32C47D337ABBE3042" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_B5A520FD64354AEE7179D337ABBE8504" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_B5A520FD64354AEE7179D337ABBE8504" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_D78368C3A7D9F0125A1BD337ABBEDBC7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_D78368C3A7D9F0125A1BD337ABBEDBC7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_BDE15BB31E3E1D26B660D337ABBEE4CD" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_BDE15BB31E3E1D26B660D337ABBEE4CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_811DEBAD0B72077013DCD337ABBE24F8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_811DEBAD0B72077013DCD337ABBE24F8" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisition" xlink:label="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisition_2A7FB489D7079E33CD6FD337ABBE1F78" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisition_2A7FB489D7079E33CD6FD337ABBE1F78" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisitionWeightedAverageGrantDateFairValue" xlink:label="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisitionWeightedAverageGrantDateFairValue_D497EFD33C6FF764CE27D337ABBECC5C" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSharesConvertedUponAcquisitionWeightedAverageGrantDateFairValue_D497EFD33C6FF764CE27D337ABBECC5C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B287473667173C5E8B54D337ABBE10E8" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B287473667173C5E8B54D337ABBE10E8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_F2E22536F50D16107D4FD337ABBE4AD0" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_F2E22536F50D16107D4FD337ABBE4AD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_B4B36361003A9C71BBFAD337ABBE812E" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_B4B36361003A9C71BBFAD337ABBE812E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0CACFFBE93F3535F888DD337ABBEA03E" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0CACFFBE93F3535F888DD337ABBEA03E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_29DD0225FBE4B15D32F7D337ABBECE7C" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_29DD0225FBE4B15D32F7D337ABBECE7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_BDA951449752656406D7D337ABBEBC8A" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_BDA951449752656406D7D337ABBEBC8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_30CD9C24E6533F435D76D337ABBEF792" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_30CD9C24E6533F435D76D337ABBEF792" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_5C84E8719939EA40BB45D337ABCDFDB9" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_27F482A1CAE10E365E8CD337ABBE1D4A" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_5C84E8719939EA40BB45D337ABCDFDB9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/StockOptionBlackScholesOptionPricingModelAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_0217C8AC5A9C826FCB7AD337AAB7D12F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_23C3B37480CC0B1FEB27D337AAB7858A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_0217C8AC5A9C826FCB7AD337AAB7D12F" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_23C3B37480CC0B1FEB27D337AAB7858A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_D24030FE617E02CD9A7ED337AAB7804F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_23C3B37480CC0B1FEB27D337AAB7858A" xlink:to="loc_us-gaap_AwardTypeAxis_D24030FE617E02CD9A7ED337AAB7804F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B032C79B2D1195B84311D337AAB73E02_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_D24030FE617E02CD9A7ED337AAB7804F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B032C79B2D1195B84311D337AAB73E02_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B032C79B2D1195B84311D337AAB73E02" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_D24030FE617E02CD9A7ED337AAB7804F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B032C79B2D1195B84311D337AAB73E02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_87142824C54DD2470F28D337AAB75AF1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B032C79B2D1195B84311D337AAB73E02" xlink:to="loc_us-gaap_EmployeeStockOptionMember_87142824C54DD2470F28D337AAB75AF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_148139289A60CFD702DDD337AAB7611D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_0217C8AC5A9C826FCB7AD337AAB7D12F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_148139289A60CFD702DDD337AAB7611D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8EDB43873E991A41C7C9D337AAB7D3EE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_0217C8AC5A9C826FCB7AD337AAB7D12F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8EDB43873E991A41C7C9D337AAB7D3EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_7F870356B8C9A33C40E6D337AAB7D9C4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_0217C8AC5A9C826FCB7AD337AAB7D12F" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_7F870356B8C9A33C40E6D337AAB7D9C4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockOptionSummaryDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9DB39A9DDCEC12FB035A3A3B1C8DF19E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9DB39A9DDCEC12FB035A3A3B1C8DF19E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_BF24F4F2175DF64737AF3A3B1C8D2F62" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9DB39A9DDCEC12FB035A3A3B1C8DF19E" xlink:to="loc_us-gaap_VestingAxis_BF24F4F2175DF64737AF3A3B1C8D2F62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_5EB9EBF5A7D1CA1899F43A3B1C8D22A8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_BF24F4F2175DF64737AF3A3B1C8D2F62" xlink:to="loc_us-gaap_VestingDomain_5EB9EBF5A7D1CA1899F43A3B1C8D22A8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_5EB9EBF5A7D1CA1899F43A3B1C8D22A8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_BF24F4F2175DF64737AF3A3B1C8D2F62" xlink:to="loc_us-gaap_VestingDomain_5EB9EBF5A7D1CA1899F43A3B1C8D22A8" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_ExpectedToVestMember" xlink:label="loc_itri_ExpectedToVestMember_3E37D57FE76ED7A24BA73A3B1C8D5FFE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_5EB9EBF5A7D1CA1899F43A3B1C8D22A8" xlink:to="loc_itri_ExpectedToVestMember_3E37D57FE76ED7A24BA73A3B1C8D5FFE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_B18573CE6020A5ED74543A3B1C8D1AED" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9DB39A9DDCEC12FB035A3A3B1C8DF19E" xlink:to="loc_us-gaap_AwardTypeAxis_B18573CE6020A5ED74543A3B1C8D1AED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5FDD3B6CA5509D8400713A3B1C8D40CA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_B18573CE6020A5ED74543A3B1C8D1AED" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5FDD3B6CA5509D8400713A3B1C8D40CA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5FDD3B6CA5509D8400713A3B1C8D40CA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_B18573CE6020A5ED74543A3B1C8D1AED" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5FDD3B6CA5509D8400713A3B1C8D40CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_600CE6852473E97A759D3A3B1C8D0DEE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5FDD3B6CA5509D8400713A3B1C8D40CA" xlink:to="loc_us-gaap_EmployeeStockMember_600CE6852473E97A759D3A3B1C8D0DEE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_F84A8AD7AE17A42283693A3B1C90587B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5FDD3B6CA5509D8400713A3B1C8D40CA" xlink:to="loc_us-gaap_EmployeeStockOptionMember_F84A8AD7AE17A42283693A3B1C90587B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_071E30B070837640D6573A3B1C905552" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_071E30B070837640D6573A3B1C905552" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_0CF30938113FE14A02293A3B1C900419" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_0CF30938113FE14A02293A3B1C900419" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_29B1E2B79EA2F48A8AE23A3B1C90FDAB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_29B1E2B79EA2F48A8AE23A3B1C90FDAB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_09D7320EBAE0B28C23ED3A3B1C900FA9" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_09D7320EBAE0B28C23ED3A3B1C900FA9" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSharesConvertedUponAcquisition" xlink:label="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSharesConvertedUponAcquisition_9BE10481AA25377A8E363A3B1C9068B5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSharesConvertedUponAcquisition_9BE10481AA25377A8E363A3B1C9068B5" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SharebasedCompensationArrangementsbySharebasedPaymentAwardOptionsSharesConvertedUponAcquisitionWeightedAverageExercisePrice" xlink:label="loc_itri_SharebasedCompensationArrangementsbySharebasedPaymentAwardOptionsSharesConvertedUponAcquisitionWeightedAverageExercisePrice_A639F67592B10952E59D3A3B1C903FBF" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_itri_SharebasedCompensationArrangementsbySharebasedPaymentAwardOptionsSharesConvertedUponAcquisitionWeightedAverageExercisePrice_A639F67592B10952E59D3A3B1C903FBF" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSharesConvertedUponAcquisitionWeightedAverageGrantDateFairValue" xlink:label="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSharesConvertedUponAcquisitionWeightedAverageGrantDateFairValue_05C45D1F7169472DE3893A3B1C905E65" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_itri_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSharesConvertedUponAcquisitionWeightedAverageGrantDateFairValue_05C45D1F7169472DE3893A3B1C905E65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_724BDF4FB2A42EF808A73A3B1C908DA1" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_724BDF4FB2A42EF808A73A3B1C908DA1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_47F47EC5CEE83E759F2E3A3B1C90DC8A" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_47F47EC5CEE83E759F2E3A3B1C90DC8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_02F36876AB17FAE969473A3B1C904EE6" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_02F36876AB17FAE969473A3B1C904EE6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_4FF72845F1D4073107E43A3B1C9087EF" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_4FF72845F1D4073107E43A3B1C9087EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_DB9DC9F3C57C64A4C4EB3A3B1C9067A4" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_DB9DC9F3C57C64A4C4EB3A3B1C9067A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_9878D5238ED9375516463A3B1C900CEB" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_9878D5238ED9375516463A3B1C900CEB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares_938911F99088EA694C5D3A3B1C90EB3F" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares_938911F99088EA694C5D3A3B1C90EB3F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue_AE80365E8710F14CCB503A3B1C90A16C" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue_AE80365E8710F14CCB503A3B1C90A16C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_37AC4CBB73BFA4DC3C033A3B1C9070DD" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_37AC4CBB73BFA4DC3C033A3B1C9070DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_B72FF92659E14CC1597A3A3B1C909F21" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_B72FF92659E14CC1597A3A3B1C909F21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_E0FC4A3E8B64B393BCA53A3B1C90D4DC" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_E0FC4A3E8B64B393BCA53A3B1C90D4DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_AE94CFDD7C6A51FF62C43A3B1C900137" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_AE94CFDD7C6A51FF62C43A3B1C900137" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_747919A739664E3E39A73A3B1C9014DC" xlink:type="locator" />
    <link:definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_747919A739664E3E39A73A3B1C9014DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_B6021683A3EEADFF4B503A3B1C909BA5" xlink:type="locator" />
    <link:definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79FA1DAF2B8395A6F2803A3B1C903ABD" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_B6021683A3EEADFF4B503A3B1C909BA5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/SubsequentEventsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/SummaryOfIntangibleAssetAccountActivityDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/SummaryOfSignificantAccountingPoliciesCashCashEquivalentAndRestrictedCashDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C5895DF57C4E77E9BE6348EAEC92CC39" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_F8989017064D455A434B48EAEC9071E8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C5895DF57C4E77E9BE6348EAEC92CC39" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_F8989017064D455A434B48EAEC9071E8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_35F1C4EBC5B4D7E6834648EAEC915BB8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_F8989017064D455A434B48EAEC9071E8" xlink:to="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_35F1C4EBC5B4D7E6834648EAEC915BB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForErrorCorrectionDomain" xlink:label="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_81C3326A2D57DB99B1AE48EAEC91ACDB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_35F1C4EBC5B4D7E6834648EAEC915BB8" xlink:to="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_81C3326A2D57DB99B1AE48EAEC91ACDB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForErrorCorrectionDomain" xlink:label="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_81C3326A2D57DB99B1AE48EAEC91ACDB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis_35F1C4EBC5B4D7E6834648EAEC915BB8" xlink:to="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_81C3326A2D57DB99B1AE48EAEC91ACDB" xlink:type="arc" />
    <link:loc xlink:href="itri-20190630.xsd#itri_ImproperNettingWithinFinancingActivitiesOnCashFlowStatementMember" xlink:label="loc_itri_ImproperNettingWithinFinancingActivitiesOnCashFlowStatementMember_73CF5662BF9990FF3DF948EAEC9260A9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsForErrorCorrectionDomain_81C3326A2D57DB99B1AE48EAEC91ACDB" xlink:to="loc_itri_ImproperNettingWithinFinancingActivitiesOnCashFlowStatementMember_73CF5662BF9990FF3DF948EAEC9260A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_AF97CDB27E9ACB236B8748EAEC921D22" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C5895DF57C4E77E9BE6348EAEC92CC39" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_AF97CDB27E9ACB236B8748EAEC921D22" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedCashCurrent" xlink:label="loc_us-gaap_RestrictedCashCurrent_9F6B72C2F202A03BF36148EAEC9209D6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C5895DF57C4E77E9BE6348EAEC92CC39" xlink:to="loc_us-gaap_RestrictedCashCurrent_9F6B72C2F202A03BF36148EAEC9209D6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedCashNoncurrent" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_3CAEE0521637A9BB5C2948EAEC936092" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C5895DF57C4E77E9BE6348EAEC92CC39" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_3CAEE0521637A9BB5C2948EAEC936092" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E4F22A6CD261909A140648EAEC9382F2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C5895DF57C4E77E9BE6348EAEC92CC39" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E4F22A6CD261909A140648EAEC9382F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_C8B993B553CAB6361F5348EAEC933B3F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C5895DF57C4E77E9BE6348EAEC92CC39" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_C8B993B553CAB6361F5348EAEC933B3F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/SummaryOfSignificantAccountingPoliciesNewAccountingPronouncementsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C6459775D97E41CA65B0D337ACF5FA6B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_2619DF3A6F003478322ED337ACF5B21C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C6459775D97E41CA65B0D337ACF5FA6B" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_2619DF3A6F003478322ED337ACF5B21C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_815ADD807B64AABF9FB2D337ACF559B1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_2619DF3A6F003478322ED337ACF5B21C" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_815ADD807B64AABF9FB2D337ACF559B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_6595E53B5FCBBEBB6950D337ACF522BF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_815ADD807B64AABF9FB2D337ACF559B1" xlink:to="loc_us-gaap_TypeOfAdoptionMember_6595E53B5FCBBEBB6950D337ACF522BF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_6595E53B5FCBBEBB6950D337ACF522BF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_815ADD807B64AABF9FB2D337ACF559B1" xlink:to="loc_us-gaap_TypeOfAdoptionMember_6595E53B5FCBBEBB6950D337ACF522BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_9E6CE691AD46E8B158FAD337ACF5CFA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_6595E53B5FCBBEBB6950D337ACF522BF" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_9E6CE691AD46E8B158FAD337ACF5CFA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_1158A7079E79BE5520CDD337ACF5587A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C6459775D97E41CA65B0D337ACF5FA6B" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_1158A7079E79BE5520CDD337ACF5587A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_9BB108B5DE0E1AFF4D6FD337ACF5ABAA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C6459775D97E41CA65B0D337ACF5FA6B" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_9BB108B5DE0E1AFF4D6FD337ACF5ABAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_A5F5FA6F66CC2C8EA2E6D337ACF5C345" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C6459775D97E41CA65B0D337ACF5FA6B" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_A5F5FA6F66CC2C8EA2E6D337ACF5C345" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_240AD760AF3CCA0C8129D337ACF5C533" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C6459775D97E41CA65B0D337ACF5FA6B" xlink:to="loc_us-gaap_OtherAssetsCurrent_240AD760AF3CCA0C8129D337ACF5C533" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_91C1EA699475FB8365E0D337ACF510B5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_C6459775D97E41CA65B0D337ACF5FA6B" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_91C1EA699475FB8365E0D337ACF510B5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.itron.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.itron.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:type="extended" />
</link:linkbase>
