<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:6a9c9b0a-393f-4aa9-848a-c70d713f9d32,g:c3ae4bfb-636b-41bb-907b-04fa3a226845-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.itron.com/role/ConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="itri-20220630.xsd#ConsolidatedStatementsofOperations"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/ConsolidatedStatementsofOperations" xlink:type="extended" id="i1c714bf7878b45b9a0defb1d188d6434_ConsolidatedStatementsofOperations">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_29b99319-a101-4ed3-8341-08ed33684682" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_RevenuesAbstract_29b99319-a101-4ed3-8341-08ed33684682" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_cc449cc8-838c-497a-9707-a7876f28187e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_29b99319-a101-4ed3-8341-08ed33684682" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_cc449cc8-838c-497a-9707-a7876f28187e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenueAbstract_6917b493-734d-4a01-a74b-74193f59a54e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_CostOfRevenueAbstract_6917b493-734d-4a01-a74b-74193f59a54e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_f4a50c49-87ff-4900-94a4-55d029adabd4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_6917b493-734d-4a01-a74b-74193f59a54e" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_f4a50c49-87ff-4900-94a4-55d029adabd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_9af119e2-4bc5-4fee-961c-38ae0f11fc7c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_GrossProfit_9af119e2-4bc5-4fee-961c-38ae0f11fc7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_2215cecb-1f4c-4975-b767-f86104a1c2fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_2215cecb-1f4c-4975-b767-f86104a1c2fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_0a0afa56-2245-41a9-affa-2b811ca43f6a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_0a0afa56-2245-41a9-affa-2b811ca43f6a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_8fcd8c07-838a-4249-ae8e-c94803837caa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_8fcd8c07-838a-4249-ae8e-c94803837caa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_GainLossOnRestructuring_7ed4856b-088d-4235-b718-4f5208a53699" xlink:href="itri-20220630.xsd#itri_GainLossOnRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:to="loc_itri_GainLossOnRestructuring_7ed4856b-088d-4235-b718-4f5208a53699" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherAssets_4d3b2061-7e9b-443b-a1d4-3cecfa70d056" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnSaleOfOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherAssets_4d3b2061-7e9b-443b-a1d4-3cecfa70d056" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_68c26576-f2e6-47c2-8599-77b420022bbd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_68c26576-f2e6-47c2-8599-77b420022bbd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_5d4939ba-6eb4-4b11-9454-7366c781c827" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:to="loc_us-gaap_OperatingExpenses_5d4939ba-6eb4-4b11-9454-7366c781c827" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_2afb2b0b-f2a5-4954-8ec2-5fd685912ff4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_98ba849e-c7c3-47f6-8eb8-2ba4ec49e884" xlink:to="loc_us-gaap_OperatingIncomeLoss_2afb2b0b-f2a5-4954-8ec2-5fd685912ff4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_6e341526-00c8-46a6-9706-aaca7a16a00b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_6e341526-00c8-46a6-9706-aaca7a16a00b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOther_0e0f472f-041c-4015-bcdf-2ce160560b7a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestIncomeOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_6e341526-00c8-46a6-9706-aaca7a16a00b" xlink:to="loc_us-gaap_InterestIncomeOther_0e0f472f-041c-4015-bcdf-2ce160560b7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_4b80832b-3c50-49a5-8291-acaff48b4657" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_6e341526-00c8-46a6-9706-aaca7a16a00b" xlink:to="loc_us-gaap_InterestExpense_4b80832b-3c50-49a5-8291-acaff48b4657" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_271d3df2-5852-4713-acfd-d91edaf457b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_6e341526-00c8-46a6-9706-aaca7a16a00b" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_271d3df2-5852-4713-acfd-d91edaf457b9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_e1243eee-1f15-4a55-b638-13d4dc76639f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_6e341526-00c8-46a6-9706-aaca7a16a00b" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_e1243eee-1f15-4a55-b638-13d4dc76639f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_b1c27b49-a04f-4a0b-bb58-c0565b160862" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_b1c27b49-a04f-4a0b-bb58-c0565b160862" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_2860bbfc-0c2d-4617-9e9c-ee6fead511a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_2860bbfc-0c2d-4617-9e9c-ee6fead511a8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_e191bdc2-41bf-453f-ae93-1e121d3e2564" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_ProfitLoss_e191bdc2-41bf-453f-ae93-1e121d3e2564" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_5aba3e53-082c-42da-bf06-2e9e744436b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_5aba3e53-082c-42da-bf06-2e9e744436b8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_bb67d72a-7b1a-472c-b169-1cceafc7e9bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_NetIncomeLoss_bb67d72a-7b1a-472c-b169-1cceafc7e9bc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_c9b9618e-fb80-403d-a037-1fece355fb13" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_EarningsPerShareBasic_c9b9618e-fb80-403d-a037-1fece355fb13" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_48aab994-a294-4012-80b3-74e1627027d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_EarningsPerShareDiluted_48aab994-a294-4012-80b3-74e1627027d1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_b72b8086-4f00-4af5-862e-8654cd9b49c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_b72b8086-4f00-4af5-862e-8654cd9b49c0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_392ef416-a0c1-4b2d-9f9f-822c7e3914a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_392ef416-a0c1-4b2d-9f9f-822c7e3914a6" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_07ca3312-570f-4609-832e-8a40be20bcb9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_60e4e5ef-f04a-4291-9017-814ca722ff01" xlink:to="loc_us-gaap_StatementTable_07ca3312-570f-4609-832e-8a40be20bcb9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_d09bf2d1-a5a4-4ca5-9840-0f646cedc783" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_07ca3312-570f-4609-832e-8a40be20bcb9" xlink:to="loc_srt_ProductOrServiceAxis_d09bf2d1-a5a4-4ca5-9840-0f646cedc783" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_d09bf2d1-a5a4-4ca5-9840-0f646cedc783_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_d09bf2d1-a5a4-4ca5-9840-0f646cedc783" xlink:to="loc_srt_ProductsAndServicesDomain_d09bf2d1-a5a4-4ca5-9840-0f646cedc783_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_0591d7c5-3de6-4057-bba7-ef772f3cb111" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_d09bf2d1-a5a4-4ca5-9840-0f646cedc783" xlink:to="loc_srt_ProductsAndServicesDomain_0591d7c5-3de6-4057-bba7-ef772f3cb111" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_1463a9e3-dc42-482f-a2aa-9ba96dd937bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0591d7c5-3de6-4057-bba7-ef772f3cb111" xlink:to="loc_us-gaap_ProductMember_1463a9e3-dc42-482f-a2aa-9ba96dd937bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_dfa33f58-de6f-4b65-9166-cb7aa04a7169" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0591d7c5-3de6-4057-bba7-ef772f3cb111" xlink:to="loc_us-gaap_ServiceMember_dfa33f58-de6f-4b65-9166-cb7aa04a7169" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/ConsolidatedStatementsofEquityStatement" xlink:type="simple" xlink:href="itri-20220630.xsd#ConsolidatedStatementsofEquityStatement"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/ConsolidatedStatementsofEquityStatement" xlink:type="extended" id="ie42b4733dd2c4fa9a39f7ea73640849b_ConsolidatedStatementsofEquityStatement">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_2c8f317e-70c2-485f-8a48-cecb88d323e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2c8f317e-70c2-485f-8a48-cecb88d323e7" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_8eb57ec6-24fc-47f0-b8f3-8691974e67e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_8eb57ec6-24fc-47f0-b8f3-8691974e67e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_73c00144-441e-4a84-9f72-95867384aeef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_73c00144-441e-4a84-9f72-95867384aeef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_8635239a-d446-414a-adce-4453828121b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_ProfitLoss_8635239a-d446-414a-adce-4453828121b7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_c8b03f35-9d12-4278-8d87-6d2d901d02e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_c8b03f35-9d12-4278-8d87-6d2d901d02e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_b0f8870e-bb36-4af0-8338-5b93c0d9887c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_b0f8870e-bb36-4af0-8338-5b93c0d9887c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_152253ce-cdfb-4d60-8b99-a25a5e5c6388" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_152253ce-cdfb-4d60-8b99-a25a5e5c6388" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_e9d5e30a-f222-45a3-b9fe-4852d2d26894" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_e9d5e30a-f222-45a3-b9fe-4852d2d26894" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_168e07d7-fa67-4e9c-ad55-dfbceeabb9a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_168e07d7-fa67-4e9c-ad55-dfbceeabb9a4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_e24cd2d8-229b-4a98-af3f-fc84f9f9805f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_e24cd2d8-229b-4a98-af3f-fc84f9f9805f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_5c292ca8-ebd6-4bc5-a737-f2e1ff09ef61" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_5c292ca8-ebd6-4bc5-a737-f2e1ff09ef61" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_StockIssuedDuringPeriodSharesNewIssuesEquityOffering_91912009-24cc-4446-bed0-eee65bd03de8" xlink:href="itri-20220630.xsd#itri_StockIssuedDuringPeriodSharesNewIssuesEquityOffering"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_itri_StockIssuedDuringPeriodSharesNewIssuesEquityOffering_91912009-24cc-4446-bed0-eee65bd03de8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_StockIssuedDuringPeriodValueNewIssuesEquityOffering_fdb00882-bab7-403b-a68a-e957de142e18" xlink:href="itri-20220630.xsd#itri_StockIssuedDuringPeriodValueNewIssuesEquityOffering"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_itri_StockIssuedDuringPeriodValueNewIssuesEquityOffering_fdb00882-bab7-403b-a68a-e957de142e18" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_0eaba16f-d52d-41cd-9ed6-317785a3168a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_0eaba16f-d52d-41cd-9ed6-317785a3168a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_PurchasesOfConvertibleNoteHedgeContractsNetOfTax_096d6095-7be9-4953-a34d-9e186dc7094b" xlink:href="itri-20220630.xsd#itri_PurchasesOfConvertibleNoteHedgeContractsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_itri_PurchasesOfConvertibleNoteHedgeContractsNetOfTax_096d6095-7be9-4953-a34d-9e186dc7094b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_3fc1dec1-5936-40bf-86ab-25fc6bcf80be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_60bfb21f-19e9-4d45-aebb-51488ab97982" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_3fc1dec1-5936-40bf-86ab-25fc6bcf80be" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_dc25e0a6-5e37-4ae9-8205-2700665fc298" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_2517698f-ece9-4f81-87f2-f6194475286f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_85963fa1-5c1d-4443-b84c-af45c7039c2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2c8f317e-70c2-485f-8a48-cecb88d323e7" xlink:to="loc_us-gaap_StatementTable_85963fa1-5c1d-4443-b84c-af45c7039c2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_e09b94d4-c1ae-436a-9019-257cb9e24128" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_85963fa1-5c1d-4443-b84c-af45c7039c2a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_e09b94d4-c1ae-436a-9019-257cb9e24128" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e09b94d4-c1ae-436a-9019-257cb9e24128_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e09b94d4-c1ae-436a-9019-257cb9e24128" xlink:to="loc_us-gaap_EquityComponentDomain_e09b94d4-c1ae-436a-9019-257cb9e24128_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e9b2d2f7-38e7-49f9-a956-bf87bee6f910" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e09b94d4-c1ae-436a-9019-257cb9e24128" xlink:to="loc_us-gaap_EquityComponentDomain_e9b2d2f7-38e7-49f9-a956-bf87bee6f910" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_8022ecab-9c35-4e1f-bde1-794e5c9a145d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e9b2d2f7-38e7-49f9-a956-bf87bee6f910" xlink:to="loc_us-gaap_ParentMember_8022ecab-9c35-4e1f-bde1-794e5c9a145d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_f59f45db-68c2-4442-9462-d1e126625378" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_8022ecab-9c35-4e1f-bde1-794e5c9a145d" xlink:to="loc_us-gaap_CommonStockMember_f59f45db-68c2-4442-9462-d1e126625378" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_a2d96e92-d744-4d02-aeaf-204c63c93897" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_8022ecab-9c35-4e1f-bde1-794e5c9a145d" xlink:to="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_a2d96e92-d744-4d02-aeaf-204c63c93897" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5b7421b1-d100-4a48-8f0d-8c1c870e331b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_8022ecab-9c35-4e1f-bde1-794e5c9a145d" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5b7421b1-d100-4a48-8f0d-8c1c870e331b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_e66ba799-c489-4dff-841f-7d529f02d3a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_8022ecab-9c35-4e1f-bde1-794e5c9a145d" xlink:to="loc_us-gaap_RetainedEarningsMember_e66ba799-c489-4dff-841f-7d529f02d3a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_d8808f0d-4a49-4edc-aa22-5bda16080328" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e9b2d2f7-38e7-49f9-a956-bf87bee6f910" xlink:to="loc_us-gaap_NoncontrollingInterestMember_d8808f0d-4a49-4edc-aa22-5bda16080328" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_dcdc58fc-06ea-4c32-958e-06147e79c38b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_85963fa1-5c1d-4443-b84c-af45c7039c2a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_dcdc58fc-06ea-4c32-958e-06147e79c38b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dcdc58fc-06ea-4c32-958e-06147e79c38b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dcdc58fc-06ea-4c32-958e-06147e79c38b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dcdc58fc-06ea-4c32-958e-06147e79c38b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9bd7e0db-2f11-4a35-8195-df90fe077b11" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dcdc58fc-06ea-4c32-958e-06147e79c38b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9bd7e0db-2f11-4a35-8195-df90fe077b11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_SIlverSpringNetworksInc.Member_42192ffe-be9e-4843-b3aa-adcdfefc7bdd" xlink:href="itri-20220630.xsd#itri_SIlverSpringNetworksInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9bd7e0db-2f11-4a35-8195-df90fe077b11" xlink:to="loc_itri_SIlverSpringNetworksInc.Member_42192ffe-be9e-4843-b3aa-adcdfefc7bdd" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/EarningsPerShareConvertibleSeniorNotesandWarrantsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#EarningsPerShareConvertibleSeniorNotesandWarrantsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/EarningsPerShareConvertibleSeniorNotesandWarrantsDetails" xlink:type="extended" id="i1e71534108da40ce88475c405d1f0244_EarningsPerShareConvertibleSeniorNotesandWarrantsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_72067552-8e83-4d5a-a0c9-6a55aefcf3ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_e4c82692-e708-46e5-b0ab-c5b3c52d9e17" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_72067552-8e83-4d5a-a0c9-6a55aefcf3ad" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_e4c82692-e708-46e5-b0ab-c5b3c52d9e17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_CommonStockConversionPrice_0e6e039a-8164-422b-92ca-533fbeb2e30c" xlink:href="itri-20220630.xsd#itri_CommonStockConversionPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_72067552-8e83-4d5a-a0c9-6a55aefcf3ad" xlink:to="loc_itri_CommonStockConversionPrice_0e6e039a-8164-422b-92ca-533fbeb2e30c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_ccc3acd3-84fa-42fe-ab33-49e379f5d1f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_72067552-8e83-4d5a-a0c9-6a55aefcf3ad" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_ccc3acd3-84fa-42fe-ab33-49e379f5d1f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_a1171eed-f22d-4c50-8c14-a2258d33a8c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_72067552-8e83-4d5a-a0c9-6a55aefcf3ad" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_a1171eed-f22d-4c50-8c14-a2258d33a8c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_d2f6d455-9b15-4a59-b876-98bb053673aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_72067552-8e83-4d5a-a0c9-6a55aefcf3ad" xlink:to="loc_us-gaap_DebtInstrumentTable_d2f6d455-9b15-4a59-b876-98bb053673aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_28023515-aa93-4bb3-bb6b-66e28d901dea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d2f6d455-9b15-4a59-b876-98bb053673aa" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_28023515-aa93-4bb3-bb6b-66e28d901dea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_28023515-aa93-4bb3-bb6b-66e28d901dea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_28023515-aa93-4bb3-bb6b-66e28d901dea" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_28023515-aa93-4bb3-bb6b-66e28d901dea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_cdd5bcbc-069e-4854-96ca-1cb107a38080" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_28023515-aa93-4bb3-bb6b-66e28d901dea" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_cdd5bcbc-069e-4854-96ca-1cb107a38080" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtSecuritiesMember_e157499f-585c-4dc9-b30f-0945aa274175" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_cdd5bcbc-069e-4854-96ca-1cb107a38080" xlink:to="loc_us-gaap_ConvertibleDebtSecuritiesMember_e157499f-585c-4dc9-b30f-0945aa274175" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/EarningsPerShareConvertibleNoteHedgeTransactionsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#EarningsPerShareConvertibleNoteHedgeTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/EarningsPerShareConvertibleNoteHedgeTransactionsDetails" xlink:type="extended" id="ib278caa3dfab468fad0a8f87090f39e4_EarningsPerShareConvertibleNoteHedgeTransactionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_82513d3a-51cf-472d-b02d-eefb93fe4002" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_81b5832f-1569-4bc6-a5d2-7e1b1db10588" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_82513d3a-51cf-472d-b02d-eefb93fe4002" xlink:to="loc_us-gaap_DerivativeNotionalAmount_81b5832f-1569-4bc6-a5d2-7e1b1db10588" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_84700f99-63f8-4712-849f-f54aa69243f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_82513d3a-51cf-472d-b02d-eefb93fe4002" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_84700f99-63f8-4712-849f-f54aa69243f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_CommonStockConversionPrice_78cdb7f7-624f-4047-8310-94b2ace89021" xlink:href="itri-20220630.xsd#itri_CommonStockConversionPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_82513d3a-51cf-472d-b02d-eefb93fe4002" xlink:to="loc_itri_CommonStockConversionPrice_78cdb7f7-624f-4047-8310-94b2ace89021" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_4dc5aee4-e1ab-4f7d-ac21-aa4d06369797" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_82513d3a-51cf-472d-b02d-eefb93fe4002" xlink:to="loc_us-gaap_DebtInstrumentTable_4dc5aee4-e1ab-4f7d-ac21-aa4d06369797" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_9ab91e0e-4330-4b5c-9879-0aa2f0c0a294" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4dc5aee4-e1ab-4f7d-ac21-aa4d06369797" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_9ab91e0e-4330-4b5c-9879-0aa2f0c0a294" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_9ab91e0e-4330-4b5c-9879-0aa2f0c0a294_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_9ab91e0e-4330-4b5c-9879-0aa2f0c0a294" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_9ab91e0e-4330-4b5c-9879-0aa2f0c0a294_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_517df584-307a-400f-91af-e9a9e9fe8b14" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_9ab91e0e-4330-4b5c-9879-0aa2f0c0a294" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_517df584-307a-400f-91af-e9a9e9fe8b14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtSecuritiesMember_d505554a-86a8-4dfc-bb85-79c6f7be0ae5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_517df584-307a-400f-91af-e9a9e9fe8b14" xlink:to="loc_us-gaap_ConvertibleDebtSecuritiesMember_d505554a-86a8-4dfc-bb85-79c6f7be0ae5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/IntangibleAssetsandLiabilitiesGrossCarryingAmountandAccumulatedAmortizationDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#IntangibleAssetsandLiabilitiesGrossCarryingAmountandAccumulatedAmortizationDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/IntangibleAssetsandLiabilitiesGrossCarryingAmountandAccumulatedAmortizationDetails" xlink:type="extended" id="i84028033f9cb431783f50d2a60f82371_IntangibleAssetsandLiabilitiesGrossCarryingAmountandAccumulatedAmortizationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_d5f10136-e2e4-417a-a095-cad129c63f93" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_d5f10136-e2e4-417a-a095-cad129c63f93" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_e584858e-7fc3-4293-9692-dc1c2e4fa453" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_e584858e-7fc3-4293-9692-dc1c2e4fa453" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_de94ebe9-c187-4ff7-9476-49f4ac181c47" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_de94ebe9-c187-4ff7-9476-49f4ac181c47" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_b83b59cd-3bba-433d-a946-16ecef08716b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_b83b59cd-3bba-433d-a946-16ecef08716b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_f303c18d-1823-47a9-a813-cd204e433288" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_f303c18d-1823-47a9-a813-cd204e433288" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_FinitelivedintangibleliabilitiesGross_d033b6ac-e55f-4632-a2a7-3696f3b06f56" xlink:href="itri-20220630.xsd#itri_FinitelivedintangibleliabilitiesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:to="loc_itri_FinitelivedintangibleliabilitiesGross_d033b6ac-e55f-4632-a2a7-3696f3b06f56" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_FiniteLivedIntangibleLiabilitiesAccumulatedAccretion_3736e174-7818-4444-b975-2cd89781da57" xlink:href="itri-20220630.xsd#itri_FiniteLivedIntangibleLiabilitiesAccumulatedAccretion"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:to="loc_itri_FiniteLivedIntangibleLiabilitiesAccumulatedAccretion_3736e174-7818-4444-b975-2cd89781da57" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_FiniteLivedIntangibleLiabilitiesNet_e1511db7-32cb-4bf7-bc3d-889b6506534b" xlink:href="itri-20220630.xsd#itri_FiniteLivedIntangibleLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:to="loc_itri_FiniteLivedIntangibleLiabilitiesNet_e1511db7-32cb-4bf7-bc3d-889b6506534b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5a2d7856-75c6-4974-b338-7e293b9dae58" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d766a9db-afd9-4103-889a-2a4c767e32ea" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5a2d7856-75c6-4974-b338-7e293b9dae58" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b9846977-97a4-4333-8f95-bb5700906a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5a2d7856-75c6-4974-b338-7e293b9dae58" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b9846977-97a4-4333-8f95-bb5700906a3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b9846977-97a4-4333-8f95-bb5700906a3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b9846977-97a4-4333-8f95-bb5700906a3c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b9846977-97a4-4333-8f95-bb5700906a3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_57520a76-023b-4a89-99f9-72f47eac1f91" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b9846977-97a4-4333-8f95-bb5700906a3c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_57520a76-023b-4a89-99f9-72f47eac1f91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_66bd99ea-600f-42cb-ac57-11a84601108a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_57520a76-023b-4a89-99f9-72f47eac1f91" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_66bd99ea-600f-42cb-ac57-11a84601108a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_dd96869f-1620-4868-bef9-76c0563e6446" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_57520a76-023b-4a89-99f9-72f47eac1f91" xlink:to="loc_us-gaap_CustomerRelationshipsMember_dd96869f-1620-4868-bef9-76c0563e6446" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_a5267e42-e541-4ec2-ad0e-e2efe79d1121" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_57520a76-023b-4a89-99f9-72f47eac1f91" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_a5267e42-e541-4ec2-ad0e-e2efe79d1121" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_e118556a-a327-4e51-93da-9f55a899adbd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_57520a76-023b-4a89-99f9-72f47eac1f91" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_e118556a-a327-4e51-93da-9f55a899adbd" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/ScheduleofGoodwillAllocatedtoReportingSegmentsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#ScheduleofGoodwillAllocatedtoReportingSegmentsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/ScheduleofGoodwillAllocatedtoReportingSegmentsDetails" xlink:type="extended" id="iaa7b617f04904d52afae826b4691f9be_ScheduleofGoodwillAllocatedtoReportingSegmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_57acebc3-3c9d-4345-b834-8dcf7c217764" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_74878d3d-960b-49a0-8c7d-a79c2c80c8bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_57acebc3-3c9d-4345-b834-8dcf7c217764" xlink:to="loc_us-gaap_GoodwillRollForward_74878d3d-960b-49a0-8c7d-a79c2c80c8bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_6c905915-c9fe-4497-893a-8314a5c20c05" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_74878d3d-960b-49a0-8c7d-a79c2c80c8bd" xlink:to="loc_us-gaap_Goodwill_6c905915-c9fe-4497-893a-8314a5c20c05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_78c16bce-0686-4484-a759-581161f11f6f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_74878d3d-960b-49a0-8c7d-a79c2c80c8bd" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_78c16bce-0686-4484-a759-581161f11f6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_a6584895-a018-48b7-89a7-ac3f55f6edce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_74878d3d-960b-49a0-8c7d-a79c2c80c8bd" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_a6584895-a018-48b7-89a7-ac3f55f6edce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_157ecdfb-9d63-487f-9a20-ef623d51d85b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_74878d3d-960b-49a0-8c7d-a79c2c80c8bd" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_157ecdfb-9d63-487f-9a20-ef623d51d85b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_654dcca4-e106-4efe-b1c2-40769ec6b83d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_e67b39b1-d054-4b9c-9f91-5e6524604213" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_57acebc3-3c9d-4345-b834-8dcf7c217764" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_e67b39b1-d054-4b9c-9f91-5e6524604213" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_e2b266cd-6717-424c-9313-9dde0d3bc9a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_e67b39b1-d054-4b9c-9f91-5e6524604213" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_e2b266cd-6717-424c-9313-9dde0d3bc9a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e2b266cd-6717-424c-9313-9dde0d3bc9a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_e2b266cd-6717-424c-9313-9dde0d3bc9a1" xlink:to="loc_us-gaap_SegmentDomain_e2b266cd-6717-424c-9313-9dde0d3bc9a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c14f79a2-070c-43c3-b963-d49e38dcf549" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_e2b266cd-6717-424c-9313-9dde0d3bc9a1" xlink:to="loc_us-gaap_SegmentDomain_c14f79a2-070c-43c3-b963-d49e38dcf549" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DeviceSolutionsMember_5cf891f4-e5bb-406e-b063-6f75ba9d9c84" xlink:href="itri-20220630.xsd#itri_DeviceSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c14f79a2-070c-43c3-b963-d49e38dcf549" xlink:to="loc_itri_DeviceSolutionsMember_5cf891f4-e5bb-406e-b063-6f75ba9d9c84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_NetworkedSolutionsSegmentMember_5c741ca8-28c3-4899-945f-b4e5690b48fc" xlink:href="itri-20220630.xsd#itri_NetworkedSolutionsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c14f79a2-070c-43c3-b963-d49e38dcf549" xlink:to="loc_itri_NetworkedSolutionsSegmentMember_5c741ca8-28c3-4899-945f-b4e5690b48fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_OutcomesSegmentMember_e2c3a1c8-4ddb-4fbc-970f-853330beed58" xlink:href="itri-20220630.xsd#itri_OutcomesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c14f79a2-070c-43c3-b963-d49e38dcf549" xlink:to="loc_itri_OutcomesSegmentMember_e2c3a1c8-4ddb-4fbc-970f-853330beed58" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/DebtScheduleofDebtComponentsofBorrowingDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#DebtScheduleofDebtComponentsofBorrowingDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/DebtScheduleofDebtComponentsofBorrowingDetails" xlink:type="extended" id="i2ab275f1ea104146b0f81fa371ffa93f_DebtScheduleofDebtComponentsofBorrowingDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_78695097-6651-4103-9215-ba6abed719fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_dd4541fb-25d8-44ba-892a-d7b65e864d74" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_78695097-6651-4103-9215-ba6abed719fd" xlink:to="loc_us-gaap_LineOfCredit_dd4541fb-25d8-44ba-892a-d7b65e864d74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebt_cf5b0ca4-682b-4194-b586-46fc76bd3955" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_78695097-6651-4103-9215-ba6abed719fd" xlink:to="loc_us-gaap_ConvertibleDebt_cf5b0ca4-682b-4194-b586-46fc76bd3955" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_96f98926-c875-4569-b709-4e07af1ec81a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_78695097-6651-4103-9215-ba6abed719fd" xlink:to="loc_us-gaap_LongTermDebt_96f98926-c875-4569-b709-4e07af1ec81a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_9fcb6aa3-357c-440e-b504-1479d73eba9c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNoncurrentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_78695097-6651-4103-9215-ba6abed719fd" xlink:to="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_9fcb6aa3-357c-440e-b504-1479d73eba9c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_83a45eae-b036-4ccd-b709-ed1fee604b77" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_78695097-6651-4103-9215-ba6abed719fd" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_83a45eae-b036-4ccd-b709-ed1fee604b77" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_48da31fc-69ae-4d69-a05e-fc704ed68f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_78695097-6651-4103-9215-ba6abed719fd" xlink:to="loc_us-gaap_DebtInstrumentTable_48da31fc-69ae-4d69-a05e-fc704ed68f6e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_e047a63e-eaad-41a1-897a-8c5123a0f63b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_48da31fc-69ae-4d69-a05e-fc704ed68f6e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_e047a63e-eaad-41a1-897a-8c5123a0f63b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e047a63e-eaad-41a1-897a-8c5123a0f63b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e047a63e-eaad-41a1-897a-8c5123a0f63b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e047a63e-eaad-41a1-897a-8c5123a0f63b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_784ca5ee-3844-4e73-af3f-9f7511398086" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e047a63e-eaad-41a1-897a-8c5123a0f63b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_784ca5ee-3844-4e73-af3f-9f7511398086" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_fc309583-cecb-4639-9fb6-20a00d01ba40" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_784ca5ee-3844-4e73-af3f-9f7511398086" xlink:to="loc_us-gaap_LineOfCreditMember_fc309583-cecb-4639-9fb6-20a00d01ba40" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_85b46d13-46f7-4230-9aea-cd63835f1130" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_784ca5ee-3844-4e73-af3f-9f7511398086" xlink:to="loc_us-gaap_SecuredDebtMember_85b46d13-46f7-4230-9aea-cd63835f1130" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtSecuritiesMember_ce7aa98d-2a64-4e5d-b565-b401789b5e04" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_784ca5ee-3844-4e73-af3f-9f7511398086" xlink:to="loc_us-gaap_ConvertibleDebtSecuritiesMember_ce7aa98d-2a64-4e5d-b565-b401789b5e04" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/DebtCreditFacilityAdditionalInformationDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#DebtCreditFacilityAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/DebtCreditFacilityAdditionalInformationDetails" xlink:type="extended" id="i5b0ada625fc448dcb40af2210c6ad455_DebtCreditFacilityAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_440b1af2-c976-4e3c-8aae-f582182d04bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_440b1af2-c976-4e3c-8aae-f582182d04bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_d0798e73-18f8-4bda-822b-06a89a9d49a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_d0798e73-18f8-4bda-822b-06a89a9d49a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_e356bf69-e888-46ca-a64f-c9f56efa8498" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_e356bf69-e888-46ca-a64f-c9f56efa8498" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_ecd051ac-2d67-424c-a640-e0bf102eac6b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_ecd051ac-2d67-424c-a640-e0bf102eac6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DebtInstrumentDebtCovenantRequiredRate_12bda6af-c3ce-404e-a4d6-c269fcaf8de0" xlink:href="itri-20220630.xsd#itri_DebtInstrumentDebtCovenantRequiredRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_itri_DebtInstrumentDebtCovenantRequiredRate_12bda6af-c3ce-404e-a4d6-c269fcaf8de0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFeeAmount_63c03007-dd90-4487-8c26-ffc7119f4490" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFeeAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_DebtInstrumentFeeAmount_63c03007-dd90-4487-8c26-ffc7119f4490" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCollateral_9c832861-5cd6-4957-b687-6103b19df32d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_DebtInstrumentCollateral_9c832861-5cd6-4957-b687-6103b19df32d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_9760a473-edf3-49bb-b291-d75ee7d4653b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_9760a473-edf3-49bb-b291-d75ee7d4653b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_73f84d03-e612-4cfa-9c2a-ae0dfcc692f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_73f84d03-e612-4cfa-9c2a-ae0dfcc692f9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_6879a3a3-7237-46ae-811c-275e7babe2f2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_LineOfCredit_6879a3a3-7237-46ae-811c-275e7babe2f2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableToBank_4e47f8b2-b34c-46b3-8f3e-6031348ead66" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LoansPayableToBank"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_LoansPayableToBank_4e47f8b2-b34c-46b3-8f3e-6031348ead66" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_2e9cc9aa-79fd-422a-a917-8b923b3ca826" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_2e9cc9aa-79fd-422a-a917-8b923b3ca826" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_b1ad1ff7-eda8-47b0-9b30-8fd3ffb4f16d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_b1ad1ff7-eda8-47b0-9b30-8fd3ffb4f16d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_294623ec-8b44-4e99-b7ca-66bd1951a1d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9dbd844-f133-48c2-9beb-8a18b3f7774e" xlink:to="loc_us-gaap_DebtInstrumentTable_294623ec-8b44-4e99-b7ca-66bd1951a1d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_35da1040-9356-44d1-83eb-e40cd1b1f0a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_294623ec-8b44-4e99-b7ca-66bd1951a1d7" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_35da1040-9356-44d1-83eb-e40cd1b1f0a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_35da1040-9356-44d1-83eb-e40cd1b1f0a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_35da1040-9356-44d1-83eb-e40cd1b1f0a4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_35da1040-9356-44d1-83eb-e40cd1b1f0a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_aa397248-13e2-47bd-a1a7-3dd0f3173803" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_35da1040-9356-44d1-83eb-e40cd1b1f0a4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_aa397248-13e2-47bd-a1a7-3dd0f3173803" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_UsdDenominatedTermLoanMember_1e5745e5-7991-4bdd-8dc2-26ce8b3cc2f7" xlink:href="itri-20220630.xsd#itri_UsdDenominatedTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_aa397248-13e2-47bd-a1a7-3dd0f3173803" xlink:to="loc_itri_UsdDenominatedTermLoanMember_1e5745e5-7991-4bdd-8dc2-26ce8b3cc2f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_ce8ab414-5f50-499c-a129-75cd70b836f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_aa397248-13e2-47bd-a1a7-3dd0f3173803" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_ce8ab414-5f50-499c-a129-75cd70b836f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_03ee8554-132b-4c6f-9afe-5d94cba1dd1f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_aa397248-13e2-47bd-a1a7-3dd0f3173803" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_03ee8554-132b-4c6f-9afe-5d94cba1dd1f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_e1d4b462-d430-4aa5-9557-a3175fbf4305" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_aa397248-13e2-47bd-a1a7-3dd0f3173803" xlink:to="loc_us-gaap_LineOfCreditMember_e1d4b462-d430-4aa5-9557-a3175fbf4305" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_ade8e86f-1b97-467d-afeb-fc3457e0d72a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_aa397248-13e2-47bd-a1a7-3dd0f3173803" xlink:to="loc_us-gaap_SecuredDebtMember_ade8e86f-1b97-467d-afeb-fc3457e0d72a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0f7bff82-4b79-448b-9c48-951cdade9761" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_294623ec-8b44-4e99-b7ca-66bd1951a1d7" xlink:to="loc_srt_RangeAxis_0f7bff82-4b79-448b-9c48-951cdade9761" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0f7bff82-4b79-448b-9c48-951cdade9761_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_0f7bff82-4b79-448b-9c48-951cdade9761" xlink:to="loc_srt_RangeMember_0f7bff82-4b79-448b-9c48-951cdade9761_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_374a06e6-0ea5-446c-9704-9fa538944f13" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_0f7bff82-4b79-448b-9c48-951cdade9761" xlink:to="loc_srt_RangeMember_374a06e6-0ea5-446c-9704-9fa538944f13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_ce045cd8-679b-42ef-92f0-2b832354e582" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_374a06e6-0ea5-446c-9704-9fa538944f13" xlink:to="loc_srt_MinimumMember_ce045cd8-679b-42ef-92f0-2b832354e582" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_7949176e-33e2-450d-ae47-955aa91f677f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_374a06e6-0ea5-446c-9704-9fa538944f13" xlink:to="loc_srt_MaximumMember_7949176e-33e2-450d-ae47-955aa91f677f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_EffectivePeriodAxis_c470ae09-30d3-4739-bcaa-13e479f9f956" xlink:href="itri-20220630.xsd#itri_EffectivePeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_294623ec-8b44-4e99-b7ca-66bd1951a1d7" xlink:to="loc_itri_EffectivePeriodAxis_c470ae09-30d3-4739-bcaa-13e479f9f956" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_EffectivePeriodDomain_c470ae09-30d3-4739-bcaa-13e479f9f956_default" xlink:href="itri-20220630.xsd#itri_EffectivePeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_itri_EffectivePeriodAxis_c470ae09-30d3-4739-bcaa-13e479f9f956" xlink:to="loc_itri_EffectivePeriodDomain_c470ae09-30d3-4739-bcaa-13e479f9f956_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_EffectivePeriodDomain_5e633162-dfc7-4db3-8c06-0969e28ae75a" xlink:href="itri-20220630.xsd#itri_EffectivePeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_itri_EffectivePeriodAxis_c470ae09-30d3-4739-bcaa-13e479f9f956" xlink:to="loc_itri_EffectivePeriodDomain_5e633162-dfc7-4db3-8c06-0969e28ae75a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_FourthQuarter2020Member_1ae319fc-9dba-4c53-814f-5970f8d93a19" xlink:href="itri-20220630.xsd#itri_FourthQuarter2020Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_itri_EffectivePeriodDomain_5e633162-dfc7-4db3-8c06-0969e28ae75a" xlink:to="loc_itri_FourthQuarter2020Member_1ae319fc-9dba-4c53-814f-5970f8d93a19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_FirstQuarter2021Member_ac59601e-8110-4755-a459-a3b4300d4016" xlink:href="itri-20220630.xsd#itri_FirstQuarter2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_itri_EffectivePeriodDomain_5e633162-dfc7-4db3-8c06-0969e28ae75a" xlink:to="loc_itri_FirstQuarter2021Member_ac59601e-8110-4755-a459-a3b4300d4016" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_54f6c7e3-bede-44a2-8046-0eedcd142059" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_294623ec-8b44-4e99-b7ca-66bd1951a1d7" xlink:to="loc_us-gaap_VariableRateAxis_54f6c7e3-bede-44a2-8046-0eedcd142059" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_54f6c7e3-bede-44a2-8046-0eedcd142059_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_54f6c7e3-bede-44a2-8046-0eedcd142059" xlink:to="loc_us-gaap_VariableRateDomain_54f6c7e3-bede-44a2-8046-0eedcd142059_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_4b332982-308b-4263-b9ab-8ff1d3d8d172" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_54f6c7e3-bede-44a2-8046-0eedcd142059" xlink:to="loc_us-gaap_VariableRateDomain_4b332982-308b-4263-b9ab-8ff1d3d8d172" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_1efba883-ead8-4aca-880a-38758611d075" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_4b332982-308b-4263-b9ab-8ff1d3d8d172" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_1efba883-ead8-4aca-880a-38758611d075" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_EURIBORMember_7fc60f46-0095-4b99-bbf1-5f3467e177d9" xlink:href="itri-20220630.xsd#itri_EURIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_4b332982-308b-4263-b9ab-8ff1d3d8d172" xlink:to="loc_itri_EURIBORMember_7fc60f46-0095-4b99-bbf1-5f3467e177d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AlternateBaseRateMember_58caf890-34f5-47b4-9461-dcbe2576bb85" xlink:href="itri-20220630.xsd#itri_AlternateBaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_4b332982-308b-4263-b9ab-8ff1d3d8d172" xlink:to="loc_itri_AlternateBaseRateMember_58caf890-34f5-47b4-9461-dcbe2576bb85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AlternateBaseRate1Member_0bb92b7a-2fb4-4837-bed8-d7c14fd30a5d" xlink:href="itri-20220630.xsd#itri_AlternateBaseRate1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_4b332982-308b-4263-b9ab-8ff1d3d8d172" xlink:to="loc_itri_AlternateBaseRate1Member_0bb92b7a-2fb4-4837-bed8-d7c14fd30a5d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AlternateBaseRate2Member_36cba91f-e7cc-43c3-8096-f2f30004291d" xlink:href="itri-20220630.xsd#itri_AlternateBaseRate2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_4b332982-308b-4263-b9ab-8ff1d3d8d172" xlink:to="loc_itri_AlternateBaseRate2Member_36cba91f-e7cc-43c3-8096-f2f30004291d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_6b3158c2-51bf-4676-abfa-a63323f2c83d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_4b332982-308b-4263-b9ab-8ff1d3d8d172" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_6b3158c2-51bf-4676-abfa-a63323f2c83d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AlternateBaseRate3Member_49aaba5b-0ddc-48bd-9eb1-30f6a16bf184" xlink:href="itri-20220630.xsd#itri_AlternateBaseRate3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_4b332982-308b-4263-b9ab-8ff1d3d8d172" xlink:to="loc_itri_AlternateBaseRate3Member_49aaba5b-0ddc-48bd-9eb1-30f6a16bf184" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_90a9d2e9-b234-4b94-bc1a-215fd7963003" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_294623ec-8b44-4e99-b7ca-66bd1951a1d7" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_90a9d2e9-b234-4b94-bc1a-215fd7963003" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_90a9d2e9-b234-4b94-bc1a-215fd7963003_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_90a9d2e9-b234-4b94-bc1a-215fd7963003" xlink:to="loc_us-gaap_LossContingencyNatureDomain_90a9d2e9-b234-4b94-bc1a-215fd7963003_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_fc3b0d23-0e2d-401b-9aad-758bce959b7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_90a9d2e9-b234-4b94-bc1a-215fd7963003" xlink:to="loc_us-gaap_LossContingencyNatureDomain_fc3b0d23-0e2d-401b-9aad-758bce959b7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_CreditFacilityMember_5d5025f4-c5c8-4c60-864a-8f94ccc4194d" xlink:href="itri-20220630.xsd#itri_CreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_fc3b0d23-0e2d-401b-9aad-758bce959b7e" xlink:to="loc_itri_CreditFacilityMember_5d5025f4-c5c8-4c60-864a-8f94ccc4194d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/DebtConvertibleNoteAdditionalInformationDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#DebtConvertibleNoteAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/DebtConvertibleNoteAdditionalInformationDetails" xlink:type="extended" id="ie569cf862f3d4503b6cae8197eb88e61_DebtConvertibleNoteAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_717fabaa-7acb-4f3b-8531-9af2b68ca819" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromConvertibleDebt_b2dcd51a-6c2a-4ad0-b2bc-41518c69c349" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_717fabaa-7acb-4f3b-8531-9af2b68ca819" xlink:to="loc_us-gaap_ProceedsFromConvertibleDebt_b2dcd51a-6c2a-4ad0-b2bc-41518c69c349" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_fca5e916-402b-414e-b651-eecff3a847db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_717fabaa-7acb-4f3b-8531-9af2b68ca819" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_fca5e916-402b-414e-b651-eecff3a847db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_44276d57-925e-42d6-898e-93fec294bd77" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_717fabaa-7acb-4f3b-8531-9af2b68ca819" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_44276d57-925e-42d6-898e-93fec294bd77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_3ee88488-0810-4caa-82ed-ad372b2ba5a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_717fabaa-7acb-4f3b-8531-9af2b68ca819" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_3ee88488-0810-4caa-82ed-ad372b2ba5a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c4d36c51-9299-4591-8921-2fb6f4663473" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_717fabaa-7acb-4f3b-8531-9af2b68ca819" xlink:to="loc_us-gaap_DebtInstrumentTable_c4d36c51-9299-4591-8921-2fb6f4663473" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_0fbcac06-d48b-4224-bd06-fb05edd5a177" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c4d36c51-9299-4591-8921-2fb6f4663473" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_0fbcac06-d48b-4224-bd06-fb05edd5a177" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0fbcac06-d48b-4224-bd06-fb05edd5a177_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0fbcac06-d48b-4224-bd06-fb05edd5a177" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0fbcac06-d48b-4224-bd06-fb05edd5a177_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_795729ec-f901-4869-9d9d-450f26631fe3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0fbcac06-d48b-4224-bd06-fb05edd5a177" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_795729ec-f901-4869-9d9d-450f26631fe3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_2c377bf3-209e-4773-b677-ced58f14b74c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_795729ec-f901-4869-9d9d-450f26631fe3" xlink:to="loc_us-gaap_ConvertibleDebtMember_2c377bf3-209e-4773-b677-ced58f14b74c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_19e9f636-65ef-4443-95d6-7a3d6a600923" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c4d36c51-9299-4591-8921-2fb6f4663473" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_19e9f636-65ef-4443-95d6-7a3d6a600923" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_19e9f636-65ef-4443-95d6-7a3d6a600923_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_19e9f636-65ef-4443-95d6-7a3d6a600923" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_19e9f636-65ef-4443-95d6-7a3d6a600923_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_d42e4333-83db-406c-810e-87d3e34c3fb0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_19e9f636-65ef-4443-95d6-7a3d6a600923" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_d42e4333-83db-406c-810e-87d3e34c3fb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodFourMember_9540cd3d-6632-48ac-8713-e4df7ec016cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_d42e4333-83db-406c-810e-87d3e34c3fb0" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodFourMember_9540cd3d-6632-48ac-8713-e4df7ec016cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_96f41ebb-93dd-4a31-a493-91abec224164" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c4d36c51-9299-4591-8921-2fb6f4663473" xlink:to="loc_srt_RangeAxis_96f41ebb-93dd-4a31-a493-91abec224164" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_96f41ebb-93dd-4a31-a493-91abec224164_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_96f41ebb-93dd-4a31-a493-91abec224164" xlink:to="loc_srt_RangeMember_96f41ebb-93dd-4a31-a493-91abec224164_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_aa2203f7-54e6-4c42-8458-29d707cf3f8c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_96f41ebb-93dd-4a31-a493-91abec224164" xlink:to="loc_srt_RangeMember_aa2203f7-54e6-4c42-8458-29d707cf3f8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_410ff81b-943e-4225-b8b2-eaec1bca7b68" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aa2203f7-54e6-4c42-8458-29d707cf3f8c" xlink:to="loc_srt_MaximumMember_410ff81b-943e-4225-b8b2-eaec1bca7b68" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/DerivativeFinancialInstrumentsDerivativeandNonderivativeHedgingInstrumentFairValueDisclosureDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#DerivativeFinancialInstrumentsDerivativeandNonderivativeHedgingInstrumentFairValueDisclosureDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativeFinancialInstrumentsDerivativeandNonderivativeHedgingInstrumentFairValueDisclosureDetails" xlink:type="extended" id="ie5e2053490d7401e9e4192947129889a_DerivativeFinancialInstrumentsDerivativeandNonderivativeHedgingInstrumentFairValueDisclosureDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_7dc65888-6ad3-4607-bf71-1bb09e0d6f2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_91d06e23-934c-4851-96cb-8157b4f1da32" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_7dc65888-6ad3-4607-bf71-1bb09e0d6f2a" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_91d06e23-934c-4851-96cb-8157b4f1da32" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_0535fa6f-df4a-4c3a-8005-01951a9a9f6f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_91d06e23-934c-4851-96cb-8157b4f1da32" xlink:to="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_0535fa6f-df4a-4c3a-8005-01951a9a9f6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_e81a9fe1-d7b7-4965-a3de-7aa2642e63d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_91d06e23-934c-4851-96cb-8157b4f1da32" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_e81a9fe1-d7b7-4965-a3de-7aa2642e63d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesAbstract_f478023f-896e-456e-b8b9-f80366c5f42d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_7dc65888-6ad3-4607-bf71-1bb09e0d6f2a" xlink:to="loc_us-gaap_DerivativeLiabilitiesAbstract_f478023f-896e-456e-b8b9-f80366c5f42d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_8c9450a0-a536-416b-8dec-cf3501da53a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_f478023f-896e-456e-b8b9-f80366c5f42d" xlink:to="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_8c9450a0-a536-416b-8dec-cf3501da53a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_0ce691d9-adf8-4370-84d1-8fa829c4bdbf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_f478023f-896e-456e-b8b9-f80366c5f42d" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_0ce691d9-adf8-4370-84d1-8fa829c4bdbf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_9afe3aa3-b4a7-4e1c-9a05-6c21d6105588" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_7dc65888-6ad3-4607-bf71-1bb09e0d6f2a" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_9afe3aa3-b4a7-4e1c-9a05-6c21d6105588" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_dfe953fd-fafc-49fa-b73b-f98cd0f33958" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_9afe3aa3-b4a7-4e1c-9a05-6c21d6105588" xlink:to="loc_us-gaap_HedgingDesignationAxis_dfe953fd-fafc-49fa-b73b-f98cd0f33958" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_dfe953fd-fafc-49fa-b73b-f98cd0f33958_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_dfe953fd-fafc-49fa-b73b-f98cd0f33958" xlink:to="loc_us-gaap_HedgingDesignationDomain_dfe953fd-fafc-49fa-b73b-f98cd0f33958_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_e8ff440a-9d68-4280-8aff-1deb34b790a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_dfe953fd-fafc-49fa-b73b-f98cd0f33958" xlink:to="loc_us-gaap_HedgingDesignationDomain_e8ff440a-9d68-4280-8aff-1deb34b790a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_c4bfd03f-da75-4a22-bdad-7a0a203823cf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_e8ff440a-9d68-4280-8aff-1deb34b790a1" xlink:to="loc_us-gaap_NondesignatedMember_c4bfd03f-da75-4a22-bdad-7a0a203823cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_ba0f3a54-a9cf-4238-9446-fe4a822c8e3b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_9afe3aa3-b4a7-4e1c-9a05-6c21d6105588" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_ba0f3a54-a9cf-4238-9446-fe4a822c8e3b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_ba0f3a54-a9cf-4238-9446-fe4a822c8e3b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_ba0f3a54-a9cf-4238-9446-fe4a822c8e3b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_ba0f3a54-a9cf-4238-9446-fe4a822c8e3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_21b76c0f-650a-46b0-ba81-c5614eaef876" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_ba0f3a54-a9cf-4238-9446-fe4a822c8e3b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_21b76c0f-650a-46b0-ba81-c5614eaef876" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_df5275af-c5b3-4007-afb6-adf678b49261" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_21b76c0f-650a-46b0-ba81-c5614eaef876" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_df5275af-c5b3-4007-afb6-adf678b49261" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_d202ef16-ccdf-4e0b-9f09-d4f506c82ec2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_21b76c0f-650a-46b0-ba81-c5614eaef876" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_d202ef16-ccdf-4e0b-9f09-d4f506c82ec2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/DerivativeFinancialInstrumentsActivityofHedgingInstrumentsinAccumulatedOCIDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#DerivativeFinancialInstrumentsActivityofHedgingInstrumentsinAccumulatedOCIDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativeFinancialInstrumentsActivityofHedgingInstrumentsinAccumulatedOCIDetails" xlink:type="extended" id="ida99513344734dc58643cc61bb28fd88_DerivativeFinancialInstrumentsActivityofHedgingInstrumentsinAccumulatedOCIDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_b32258c3-72b7-4157-b208-9b1666614a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_23a16961-adfd-4d12-aefd-738648a1b208" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b32258c3-72b7-4157-b208-9b1666614a3c" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_23a16961-adfd-4d12-aefd-738648a1b208" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_fb9c6b44-23ad-48f5-84b8-f53b51e1ecf1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b32258c3-72b7-4157-b208-9b1666614a3c" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_fb9c6b44-23ad-48f5-84b8-f53b51e1ecf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_4cfaffce-d554-425e-98ff-7137adf84159" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b32258c3-72b7-4157-b208-9b1666614a3c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_4cfaffce-d554-425e-98ff-7137adf84159" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_e1471658-31ef-4622-a45e-d4fb74107017" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_14cb8d6b-c576-4148-ba85-c558ed75e0bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_b32258c3-72b7-4157-b208-9b1666614a3c" xlink:to="loc_us-gaap_StatementTable_14cb8d6b-c576-4148-ba85-c558ed75e0bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_9abe0f91-b805-4588-8acd-44b26f109496" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_14cb8d6b-c576-4148-ba85-c558ed75e0bc" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_9abe0f91-b805-4588-8acd-44b26f109496" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_9abe0f91-b805-4588-8acd-44b26f109496_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9abe0f91-b805-4588-8acd-44b26f109496" xlink:to="loc_us-gaap_EquityComponentDomain_9abe0f91-b805-4588-8acd-44b26f109496_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ab4f3d64-9829-4a64-aeb2-71807efa1931" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9abe0f91-b805-4588-8acd-44b26f109496" xlink:to="loc_us-gaap_EquityComponentDomain_ab4f3d64-9829-4a64-aeb2-71807efa1931" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AccumulatedNetGainLossfromDerivativeandNonderivativeInstrumentsDesignatedasHedgingInstrumentsMember_9041d0cc-3d3b-421d-a5d9-b0ad3b03b15b" xlink:href="itri-20220630.xsd#itri_AccumulatedNetGainLossfromDerivativeandNonderivativeInstrumentsDesignatedasHedgingInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ab4f3d64-9829-4a64-aeb2-71807efa1931" xlink:to="loc_itri_AccumulatedNetGainLossfromDerivativeandNonderivativeInstrumentsDesignatedasHedgingInstrumentsMember_9041d0cc-3d3b-421d-a5d9-b0ad3b03b15b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#DerivativeFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="extended" id="i1c5982edd7eb4c0184bb584308c4fefa_DerivativeFinancialInstrumentsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_7e1d4158-fdc3-4ec9-8f99-c187df11b1f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_7e1d4158-fdc3-4ec9-8f99-c187df11b1f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DerivativeCounterparties_3e18fcf2-0680-4feb-87f2-50d46fc8aed3" xlink:href="itri-20220630.xsd#itri_DerivativeCounterparties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_itri_DerivativeCounterparties_3e18fcf2-0680-4feb-87f2-50d46fc8aed3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_a8838394-3bdf-4bf7-b53a-9e24a880ad8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_us-gaap_DerivativeNotionalAmount_a8838394-3bdf-4bf7-b53a-9e24a880ad8d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DerivativePurchasePrice_b329b706-de94-429e-bcbb-5ccbfad27426" xlink:href="itri-20220630.xsd#itri_DerivativePurchasePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_itri_DerivativePurchasePrice_b329b706-de94-429e-bcbb-5ccbfad27426" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_af0226a2-f28c-4812-a013-66c9b60d763f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_af0226a2-f28c-4812-a013-66c9b60d763f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_06f9e44d-cd20-42c1-b3b6-9fbb04453de6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_06f9e44d-cd20-42c1-b3b6-9fbb04453de6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_CommonStockConversionPrice_d55e00a7-6575-4dc4-8e24-d9f0c09d7622" xlink:href="itri-20220630.xsd#itri_CommonStockConversionPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_itri_CommonStockConversionPrice_d55e00a7-6575-4dc4-8e24-d9f0c09d7622" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsDerivativeInstruments_951965fc-e9f3-4766-ab0b-f81651eb2a2d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsDerivativeInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_us-gaap_DeferredTaxAssetsDerivativeInstruments_951965fc-e9f3-4766-ab0b-f81651eb2a2d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_39e4018d-d26f-42ef-a892-5f539c4281a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_39e4018d-d26f-42ef-a892-5f539c4281a7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_d461591a-0526-4ce4-9a1c-4b353bbe7821" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_d461591a-0526-4ce4-9a1c-4b353bbe7821" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_ClassOfWarrantOrRightPremiumPercentage_54a2dfd5-60c6-4d6c-8b07-e3336199e109" xlink:href="itri-20220630.xsd#itri_ClassOfWarrantOrRightPremiumPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_itri_ClassOfWarrantOrRightPremiumPercentage_54a2dfd5-60c6-4d6c-8b07-e3336199e109" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_ClassOfWarrantOrRightAggregateProceedsFromTransaction_37b4dd0c-70d3-4b85-9876-98210cfa7e1d" xlink:href="itri-20220630.xsd#itri_ClassOfWarrantOrRightAggregateProceedsFromTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_itri_ClassOfWarrantOrRightAggregateProceedsFromTransaction_37b4dd0c-70d3-4b85-9876-98210cfa7e1d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_ef810c3c-d242-4c7e-b736-ba1ddb2a0a13" xlink:to="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_5fb75b61-4c37-4e1b-b47b-e45a946046b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_5fb75b61-4c37-4e1b-b47b-e45a946046b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5fb75b61-4c37-4e1b-b47b-e45a946046b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5fb75b61-4c37-4e1b-b47b-e45a946046b6" xlink:to="loc_us-gaap_EquityComponentDomain_5fb75b61-4c37-4e1b-b47b-e45a946046b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_fdc5fefd-8d06-4ce6-9f2a-dd3f93aabc8e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5fb75b61-4c37-4e1b-b47b-e45a946046b6" xlink:to="loc_us-gaap_EquityComponentDomain_fdc5fefd-8d06-4ce6-9f2a-dd3f93aabc8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember_2746c8bc-d813-4ac6-83ef-d397ae4a134d" xlink:href="itri-20220630.xsd#itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_fdc5fefd-8d06-4ce6-9f2a-dd3f93aabc8e" xlink:to="loc_itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember_2746c8bc-d813-4ac6-83ef-d397ae4a134d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyAxis_a9994470-9cbe-4e30-9dfc-744182564618" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EnergyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:to="loc_srt_EnergyAxis_a9994470-9cbe-4e30-9dfc-744182564618" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_a9994470-9cbe-4e30-9dfc-744182564618_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_EnergyAxis_a9994470-9cbe-4e30-9dfc-744182564618" xlink:to="loc_srt_EnergyDomain_a9994470-9cbe-4e30-9dfc-744182564618_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_16884460-b9cf-4b9d-91ba-bf66f4d00d7c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_EnergyAxis_a9994470-9cbe-4e30-9dfc-744182564618" xlink:to="loc_srt_EnergyDomain_16884460-b9cf-4b9d-91ba-bf66f4d00d7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_527aac7b-2185-4d21-b01e-956419dfa193" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:to="loc_us-gaap_VariableRateAxis_527aac7b-2185-4d21-b01e-956419dfa193" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_527aac7b-2185-4d21-b01e-956419dfa193_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_527aac7b-2185-4d21-b01e-956419dfa193" xlink:to="loc_us-gaap_VariableRateDomain_527aac7b-2185-4d21-b01e-956419dfa193_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_2c608a84-7c02-4321-8e1a-4f288393aaa9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_527aac7b-2185-4d21-b01e-956419dfa193" xlink:to="loc_us-gaap_VariableRateDomain_2c608a84-7c02-4321-8e1a-4f288393aaa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_d4de05ff-c7e8-4bb5-8550-c2d09cdd1026" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_d4de05ff-c7e8-4bb5-8550-c2d09cdd1026" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_d4de05ff-c7e8-4bb5-8550-c2d09cdd1026_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_d4de05ff-c7e8-4bb5-8550-c2d09cdd1026" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_d4de05ff-c7e8-4bb5-8550-c2d09cdd1026_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_2898e47c-76ce-4241-8358-d2ff6010f51b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_d4de05ff-c7e8-4bb5-8550-c2d09cdd1026" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_2898e47c-76ce-4241-8358-d2ff6010f51b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeOptionMember_c310c2fa-740e-460f-9f3f-e525465f84da" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignExchangeOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_2898e47c-76ce-4241-8358-d2ff6010f51b" xlink:to="loc_us-gaap_ForeignExchangeOptionMember_c310c2fa-740e-460f-9f3f-e525465f84da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractsMember_3fc1013f-a271-49e8-81d4-dac53f33033c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForwardContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_2898e47c-76ce-4241-8358-d2ff6010f51b" xlink:to="loc_us-gaap_ForwardContractsMember_3fc1013f-a271-49e8-81d4-dac53f33033c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_b67a1436-3fb7-4566-912a-3ba19c10392c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_2898e47c-76ce-4241-8358-d2ff6010f51b" xlink:to="loc_us-gaap_ForeignExchangeContractMember_b67a1436-3fb7-4566-912a-3ba19c10392c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionAxis_ab17c2e4-14c2-4e6a-a6cb-92b9f327b741" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PositionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:to="loc_us-gaap_PositionAxis_ab17c2e4-14c2-4e6a-a6cb-92b9f327b741" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionDomain_ab17c2e4-14c2-4e6a-a6cb-92b9f327b741_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PositionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PositionAxis_ab17c2e4-14c2-4e6a-a6cb-92b9f327b741" xlink:to="loc_us-gaap_PositionDomain_ab17c2e4-14c2-4e6a-a6cb-92b9f327b741_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionDomain_aece7d40-6021-435b-aa80-41b75d5a2616" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PositionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PositionAxis_ab17c2e4-14c2-4e6a-a6cb-92b9f327b741" xlink:to="loc_us-gaap_PositionDomain_aece7d40-6021-435b-aa80-41b75d5a2616" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d30c6206-5701-495e-a1cb-3481bfa95513" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:to="loc_srt_RangeAxis_d30c6206-5701-495e-a1cb-3481bfa95513" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d30c6206-5701-495e-a1cb-3481bfa95513_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d30c6206-5701-495e-a1cb-3481bfa95513" xlink:to="loc_srt_RangeMember_d30c6206-5701-495e-a1cb-3481bfa95513_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_20dc82bb-c474-41f3-a099-c03aacecaddc" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d30c6206-5701-495e-a1cb-3481bfa95513" xlink:to="loc_srt_RangeMember_20dc82bb-c474-41f3-a099-c03aacecaddc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_22185d24-fd6c-4c43-934f-40a474777d52" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_20dc82bb-c474-41f3-a099-c03aacecaddc" xlink:to="loc_srt_MinimumMember_22185d24-fd6c-4c43-934f-40a474777d52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6d66ec45-d1ab-4b7f-9922-f30533960c1c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_20dc82bb-c474-41f3-a099-c03aacecaddc" xlink:to="loc_srt_MaximumMember_6d66ec45-d1ab-4b7f-9922-f30533960c1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DerivativeActivityVolumeTypeAxis_6afb7a3c-f06d-45ca-b182-6285c019879b" xlink:href="itri-20220630.xsd#itri_DerivativeActivityVolumeTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:to="loc_itri_DerivativeActivityVolumeTypeAxis_6afb7a3c-f06d-45ca-b182-6285c019879b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DerivativeActivityVolumeTypeDomain_6afb7a3c-f06d-45ca-b182-6285c019879b_default" xlink:href="itri-20220630.xsd#itri_DerivativeActivityVolumeTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_itri_DerivativeActivityVolumeTypeAxis_6afb7a3c-f06d-45ca-b182-6285c019879b" xlink:to="loc_itri_DerivativeActivityVolumeTypeDomain_6afb7a3c-f06d-45ca-b182-6285c019879b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DerivativeActivityVolumeTypeDomain_ff9feeea-9e2d-4613-bf35-d52a224ea29e" xlink:href="itri-20220630.xsd#itri_DerivativeActivityVolumeTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_itri_DerivativeActivityVolumeTypeAxis_6afb7a3c-f06d-45ca-b182-6285c019879b" xlink:to="loc_itri_DerivativeActivityVolumeTypeDomain_ff9feeea-9e2d-4613-bf35-d52a224ea29e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_NumberOfCounterpartiesMember_eb8c8730-af28-49e1-8859-dd09e4a9c3f4" xlink:href="itri-20220630.xsd#itri_NumberOfCounterpartiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_itri_DerivativeActivityVolumeTypeDomain_ff9feeea-9e2d-4613-bf35-d52a224ea29e" xlink:to="loc_itri_NumberOfCounterpartiesMember_eb8c8730-af28-49e1-8859-dd09e4a9c3f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_41f97d82-c45b-4eaf-881d-e05416dcac07" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:to="loc_us-gaap_HedgingDesignationAxis_41f97d82-c45b-4eaf-881d-e05416dcac07" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_41f97d82-c45b-4eaf-881d-e05416dcac07_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_41f97d82-c45b-4eaf-881d-e05416dcac07" xlink:to="loc_us-gaap_HedgingDesignationDomain_41f97d82-c45b-4eaf-881d-e05416dcac07_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_6505648f-18bc-4185-b08c-c890674f28eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_41f97d82-c45b-4eaf-881d-e05416dcac07" xlink:to="loc_us-gaap_HedgingDesignationDomain_6505648f-18bc-4185-b08c-c890674f28eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_74ebbe5d-f4cf-4149-ad7f-998f9c89d421" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_6505648f-18bc-4185-b08c-c890674f28eb" xlink:to="loc_us-gaap_NondesignatedMember_74ebbe5d-f4cf-4149-ad7f-998f9c89d421" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2d824959-3df2-4739-b22b-bf1e38443bac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_95290ede-0c02-42a8-a5a3-6eab71775891" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2d824959-3df2-4739-b22b-bf1e38443bac" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_2d824959-3df2-4739-b22b-bf1e38443bac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2d824959-3df2-4739-b22b-bf1e38443bac" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_2d824959-3df2-4739-b22b-bf1e38443bac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_a2a10d10-d384-4549-a69b-de231567fdd5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2d824959-3df2-4739-b22b-bf1e38443bac" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_a2a10d10-d384-4549-a69b-de231567fdd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtSecuritiesMember_11bdd3e2-618a-4f25-8d7b-e78caaef8e13" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_a2a10d10-d384-4549-a69b-de231567fdd5" xlink:to="loc_us-gaap_ConvertibleDebtSecuritiesMember_11bdd3e2-618a-4f25-8d7b-e78caaef8e13" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/DerivativeFinancialInstrumentsEffectofCashFlowDerivativesontheBalanceSheetandIncomeStatementBeforeTaxDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#DerivativeFinancialInstrumentsEffectofCashFlowDerivativesontheBalanceSheetandIncomeStatementBeforeTaxDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativeFinancialInstrumentsEffectofCashFlowDerivativesontheBalanceSheetandIncomeStatementBeforeTaxDetails" xlink:type="extended" id="i8b1b08e83a164d5aa9be43e50765dc1f_DerivativeFinancialInstrumentsEffectofCashFlowDerivativesontheBalanceSheetandIncomeStatementBeforeTaxDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_d89c1d66-f118-4256-b67a-8328a6636549" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateDerivativesAbstract_c3bf1e9c-aae6-4b4f-9652-d926d6b49749" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateDerivativesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d89c1d66-f118-4256-b67a-8328a6636549" xlink:to="loc_us-gaap_InterestRateDerivativesAbstract_c3bf1e9c-aae6-4b4f-9652-d926d6b49749" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss_2b22a408-41c5-4841-9751-38f8fbb20459" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateDerivativesAbstract_c3bf1e9c-aae6-4b4f-9652-d926d6b49749" xlink:to="loc_us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss_2b22a408-41c5-4841-9751-38f8fbb20459" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_726cbf80-487a-4d7d-90a8-0fc40487489d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateDerivativesAbstract_c3bf1e9c-aae6-4b4f-9652-d926d6b49749" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_726cbf80-487a-4d7d-90a8-0fc40487489d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_f903361b-3bf0-40fe-85f3-6f7038c3d0c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_d89c1d66-f118-4256-b67a-8328a6636549" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_f903361b-3bf0-40fe-85f3-6f7038c3d0c1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_208f87d1-585c-40d5-a569-f30599ff28d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_f903361b-3bf0-40fe-85f3-6f7038c3d0c1" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_208f87d1-585c-40d5-a569-f30599ff28d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_208f87d1-585c-40d5-a569-f30599ff28d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_208f87d1-585c-40d5-a569-f30599ff28d4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_208f87d1-585c-40d5-a569-f30599ff28d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_cef337b7-c562-4fe5-acae-5b962a04e153" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_208f87d1-585c-40d5-a569-f30599ff28d4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_cef337b7-c562-4fe5-acae-5b962a04e153" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeOptionMember_74e632cc-0999-4e74-9e5c-b3f9adac303f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignExchangeOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_cef337b7-c562-4fe5-acae-5b962a04e153" xlink:to="loc_us-gaap_ForeignExchangeOptionMember_74e632cc-0999-4e74-9e5c-b3f9adac303f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_a7c25b7e-8f40-48a2-9fff-6e36f2dc1280" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_cef337b7-c562-4fe5-acae-5b962a04e153" xlink:to="loc_us-gaap_CurrencySwapMember_a7c25b7e-8f40-48a2-9fff-6e36f2dc1280" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_CurrencySwap2Member_fa6244dc-a210-4003-8f73-8d2afe2fbaea" xlink:href="itri-20220630.xsd#itri_CurrencySwap2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_cef337b7-c562-4fe5-acae-5b962a04e153" xlink:to="loc_itri_CurrencySwap2Member_fa6244dc-a210-4003-8f73-8d2afe2fbaea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_0ba03d59-b865-451b-92fa-c595c49fa0e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_cef337b7-c562-4fe5-acae-5b962a04e153" xlink:to="loc_us-gaap_InterestRateSwapMember_0ba03d59-b865-451b-92fa-c595c49fa0e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_InterestRateSwap2Member_1dace07f-c553-4692-acdd-e78d160b334b" xlink:href="itri-20220630.xsd#itri_InterestRateSwap2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_cef337b7-c562-4fe5-acae-5b962a04e153" xlink:to="loc_itri_InterestRateSwap2Member_1dace07f-c553-4692-acdd-e78d160b334b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_CurrencySwap1Member_a0e00a11-e97d-4758-8144-fa5bfbf0480e" xlink:href="itri-20220630.xsd#itri_CurrencySwap1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_cef337b7-c562-4fe5-acae-5b962a04e153" xlink:to="loc_itri_CurrencySwap1Member_a0e00a11-e97d-4758-8144-fa5bfbf0480e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_7ef2a266-0e82-4650-b38c-5a89ca806e40" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_f903361b-3bf0-40fe-85f3-6f7038c3d0c1" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_7ef2a266-0e82-4650-b38c-5a89ca806e40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_7ef2a266-0e82-4650-b38c-5a89ca806e40_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_7ef2a266-0e82-4650-b38c-5a89ca806e40" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_7ef2a266-0e82-4650-b38c-5a89ca806e40_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c880dbff-4bb3-4527-a830-6a7337cc653f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_7ef2a266-0e82-4650-b38c-5a89ca806e40" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c880dbff-4bb3-4527-a830-6a7337cc653f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_a1bf98bb-74b3-4595-9257-47b83890e480" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c880dbff-4bb3-4527-a830-6a7337cc653f" xlink:to="loc_us-gaap_CostOfSalesMember_a1bf98bb-74b3-4595-9257-47b83890e480" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_3f9c17b1-5c30-445a-8cff-36e364b935a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c880dbff-4bb3-4527-a830-6a7337cc653f" xlink:to="loc_us-gaap_InterestExpenseMember_3f9c17b1-5c30-445a-8cff-36e364b935a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_OtherIncomeExpenseMember_60a079ef-6fed-410a-aae9-b924aca0fadf" xlink:href="itri-20220630.xsd#itri_OtherIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c880dbff-4bb3-4527-a830-6a7337cc653f" xlink:to="loc_itri_OtherIncomeExpenseMember_60a079ef-6fed-410a-aae9-b924aca0fadf" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/DerivativeFinancialInstrumentsDerivativesNotDesignatedasHedgingRelationshipsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#DerivativeFinancialInstrumentsDerivativesNotDesignatedasHedgingRelationshipsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/DerivativeFinancialInstrumentsDerivativesNotDesignatedasHedgingRelationshipsDetails" xlink:type="extended" id="i764afb643cb047d193fd095ffa489739_DerivativeFinancialInstrumentsDerivativesNotDesignatedasHedgingRelationshipsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_0c2af5cf-beca-4704-b7e7-ff03194999e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_bf58d072-b0f0-49d4-b8ec-0b271a2874a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_0c2af5cf-beca-4704-b7e7-ff03194999e9" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_bf58d072-b0f0-49d4-b8ec-0b271a2874a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments_bda260cc-e170-432d-b1ae-156603da3d26" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_bf58d072-b0f0-49d4-b8ec-0b271a2874a9" xlink:to="loc_us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments_bda260cc-e170-432d-b1ae-156603da3d26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_ab12c32d-9c1c-4628-b25a-67ca0102fc24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_0c2af5cf-beca-4704-b7e7-ff03194999e9" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_ab12c32d-9c1c-4628-b25a-67ca0102fc24" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_d26bcd92-a4d9-44e2-9022-e478308fc155" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_ab12c32d-9c1c-4628-b25a-67ca0102fc24" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_d26bcd92-a4d9-44e2-9022-e478308fc155" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_d26bcd92-a4d9-44e2-9022-e478308fc155_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d26bcd92-a4d9-44e2-9022-e478308fc155" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_d26bcd92-a4d9-44e2-9022-e478308fc155_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_15d70e8e-d800-4f22-9b71-0c37023f322f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d26bcd92-a4d9-44e2-9022-e478308fc155" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_15d70e8e-d800-4f22-9b71-0c37023f322f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_OtherIncomeExpenseMember_8e28b9ff-7bb5-4d7f-8ee7-16e2fd957fc6" xlink:href="itri-20220630.xsd#itri_OtherIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_15d70e8e-d800-4f22-9b71-0c37023f322f" xlink:to="loc_itri_OtherIncomeExpenseMember_8e28b9ff-7bb5-4d7f-8ee7-16e2fd957fc6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationExpenseandRelatedTaxBenefitDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#StockBasedCompensationExpenseandRelatedTaxBenefitDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationExpenseandRelatedTaxBenefitDetails" xlink:type="extended" id="if1c497ec176f442ab0d91b37d57f7a44_StockBasedCompensationExpenseandRelatedTaxBenefitDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697a4c40-c72b-49ae-9259-e978080e3776" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionPlanExpense_957b7922-1934-4d23-8a5f-b7e8edf8ff4f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockOptionPlanExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697a4c40-c72b-49ae-9259-e978080e3776" xlink:to="loc_us-gaap_StockOptionPlanExpense_957b7922-1934-4d23-8a5f-b7e8edf8ff4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockExpense_e6af6074-52cb-4e52-81ff-47facf000fc1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697a4c40-c72b-49ae-9259-e978080e3776" xlink:to="loc_us-gaap_RestrictedStockExpense_e6af6074-52cb-4e52-81ff-47facf000fc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_UnrestrictedStockAwardsCompensationExpense_a21d8446-0fd8-4869-9a46-783a9a6337cd" xlink:href="itri-20220630.xsd#itri_UnrestrictedStockAwardsCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697a4c40-c72b-49ae-9259-e978080e3776" xlink:to="loc_itri_UnrestrictedStockAwardsCompensationExpense_a21d8446-0fd8-4869-9a46-783a9a6337cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_cecab90e-81e4-4992-90c8-d1488207be2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697a4c40-c72b-49ae-9259-e978080e3776" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_cecab90e-81e4-4992-90c8-d1488207be2a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_29d70489-2d4c-48f2-8efc-efc28fd49df4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697a4c40-c72b-49ae-9259-e978080e3776" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_29d70489-2d4c-48f2-8efc-efc28fd49df4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_fadc76c8-c6b6-49f4-8795-25f75a4c66a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697a4c40-c72b-49ae-9259-e978080e3776" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_fadc76c8-c6b6-49f4-8795-25f75a4c66a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8241dddd-373e-4f2b-8801-5565985f4698" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_697a4c40-c72b-49ae-9259-e978080e3776" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8241dddd-373e-4f2b-8801-5565985f4698" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_27a59e9d-cb6d-4642-b14c-e8ea3a3896ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8241dddd-373e-4f2b-8801-5565985f4698" xlink:to="loc_us-gaap_PlanNameAxis_27a59e9d-cb6d-4642-b14c-e8ea3a3896ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_27a59e9d-cb6d-4642-b14c-e8ea3a3896ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_27a59e9d-cb6d-4642-b14c-e8ea3a3896ea" xlink:to="loc_us-gaap_PlanNameDomain_27a59e9d-cb6d-4642-b14c-e8ea3a3896ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_0333e3bd-0ab1-461e-aa66-ece8dcedb896" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_27a59e9d-cb6d-4642-b14c-e8ea3a3896ea" xlink:to="loc_us-gaap_PlanNameDomain_0333e3bd-0ab1-461e-aa66-ece8dcedb896" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_StockIncentivePlanMember_dfb8f9c1-96c1-4bfa-be04-bd1a42c7277c" xlink:href="itri-20220630.xsd#itri_StockIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_0333e3bd-0ab1-461e-aa66-ece8dcedb896" xlink:to="loc_itri_StockIncentivePlanMember_dfb8f9c1-96c1-4bfa-be04-bd1a42c7277c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e238798b-e96f-4acd-990b-f1765c957c3f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8241dddd-373e-4f2b-8801-5565985f4698" xlink:to="loc_us-gaap_AwardTypeAxis_e238798b-e96f-4acd-990b-f1765c957c3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e238798b-e96f-4acd-990b-f1765c957c3f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e238798b-e96f-4acd-990b-f1765c957c3f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e238798b-e96f-4acd-990b-f1765c957c3f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cbb10358-576b-47d7-b8fc-b17200f5ad9a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e238798b-e96f-4acd-990b-f1765c957c3f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cbb10358-576b-47d7-b8fc-b17200f5ad9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_f621b94e-7342-498a-934d-6ed9a4acdb1d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cbb10358-576b-47d7-b8fc-b17200f5ad9a" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_f621b94e-7342-498a-934d-6ed9a4acdb1d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/StockOptionSummaryDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#StockOptionSummaryDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockOptionSummaryDetails" xlink:type="extended" id="ifddc6730c9f54bd1ad1f7f5600c0eecf_StockOptionSummaryDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d5a6de9f-c6b6-4c04-ba75-94a7e791771b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_2552d4c8-8488-4fcd-b83d-ae28a4d00668" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d5a6de9f-c6b6-4c04-ba75-94a7e791771b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_2552d4c8-8488-4fcd-b83d-ae28a4d00668" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4fdd313e-3c47-41cb-9676-4049cb3f1314" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_2552d4c8-8488-4fcd-b83d-ae28a4d00668" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4fdd313e-3c47-41cb-9676-4049cb3f1314" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_bff17051-6077-40d2-88fd-a73b26b1b7a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_2552d4c8-8488-4fcd-b83d-ae28a4d00668" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_bff17051-6077-40d2-88fd-a73b26b1b7a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_406b4396-6412-4975-b7ec-1de20b3263c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_2552d4c8-8488-4fcd-b83d-ae28a4d00668" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_406b4396-6412-4975-b7ec-1de20b3263c8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares_24ebaa2a-6edf-4f58-a35a-0208568001a3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_2552d4c8-8488-4fcd-b83d-ae28a4d00668" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares_24ebaa2a-6edf-4f58-a35a-0208568001a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_8d758527-2031-4eb4-8ae2-d8f55963ddb6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_2552d4c8-8488-4fcd-b83d-ae28a4d00668" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_8d758527-2031-4eb4-8ae2-d8f55963ddb6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_d4b0623e-7240-414e-afd7-c0e8476fa6f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_8cfbca02-11ba-4a0a-ba9d-244bbc65bb5d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d5a6de9f-c6b6-4c04-ba75-94a7e791771b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_8cfbca02-11ba-4a0a-ba9d-244bbc65bb5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7b2cfb27-d05d-4c24-bfa5-b9b606b7581e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d5a6de9f-c6b6-4c04-ba75-94a7e791771b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7b2cfb27-d05d-4c24-bfa5-b9b606b7581e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_5a16c143-b3b9-420f-a4b8-3dc53591a8bf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7b2cfb27-d05d-4c24-bfa5-b9b606b7581e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_5a16c143-b3b9-420f-a4b8-3dc53591a8bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_1a180fd1-6137-4f25-a09d-2d023b40341b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7b2cfb27-d05d-4c24-bfa5-b9b606b7581e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_1a180fd1-6137-4f25-a09d-2d023b40341b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_3dd23fb0-b79f-49ae-9aac-845219822e7f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7b2cfb27-d05d-4c24-bfa5-b9b606b7581e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_3dd23fb0-b79f-49ae-9aac-845219822e7f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue_092ed656-eb22-452d-b3b2-84090cdf4511" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7b2cfb27-d05d-4c24-bfa5-b9b606b7581e" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue_092ed656-eb22-452d-b3b2-84090cdf4511" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_5832f11d-b3c0-44f0-adcd-a0098b1dc3dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_7b2cfb27-d05d-4c24-bfa5-b9b606b7581e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_5832f11d-b3c0-44f0-adcd-a0098b1dc3dc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_136be80a-7099-4a19-b7c0-20363cb82a92" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_f87ad18f-c3ad-4022-8cde-ef1e9277c53a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d5a6de9f-c6b6-4c04-ba75-94a7e791771b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_f87ad18f-c3ad-4022-8cde-ef1e9277c53a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_09076b8f-6ed3-4457-a785-ec8a0c347528" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d5a6de9f-c6b6-4c04-ba75-94a7e791771b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_09076b8f-6ed3-4457-a785-ec8a0c347528" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_94cccf63-a22d-4284-ba38-736fb4b5a894" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_09076b8f-6ed3-4457-a785-ec8a0c347528" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_94cccf63-a22d-4284-ba38-736fb4b5a894" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_be54ba1d-45d8-40c0-bd87-61ba2463e4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_09076b8f-6ed3-4457-a785-ec8a0c347528" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_be54ba1d-45d8-40c0-bd87-61ba2463e4c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_d4f549cc-c829-4052-a47c-cd37e356e394" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_09076b8f-6ed3-4457-a785-ec8a0c347528" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_d4f549cc-c829-4052-a47c-cd37e356e394" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_43c83519-2ffe-44ce-bb88-9baa8c8c55bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_09076b8f-6ed3-4457-a785-ec8a0c347528" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_43c83519-2ffe-44ce-bb88-9baa8c8c55bd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_84b78695-a26c-4989-ba42-a2713353f9cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_031fe60e-bfca-49ff-ae35-e6ee1765df2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_f462d8f3-bf4e-4b8c-ade1-804b6b349ce2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_09076b8f-6ed3-4457-a785-ec8a0c347528" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_f462d8f3-bf4e-4b8c-ade1-804b6b349ce2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_a70270be-5168-4b98-b664-7478f24267d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_09076b8f-6ed3-4457-a785-ec8a0c347528" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_a70270be-5168-4b98-b664-7478f24267d7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_780dc5fc-4f8f-4620-b217-cb9be8f06623" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d5a6de9f-c6b6-4c04-ba75-94a7e791771b" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_780dc5fc-4f8f-4620-b217-cb9be8f06623" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_f1e6c387-2bd3-4ec5-ad3b-271d52c9e213" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_780dc5fc-4f8f-4620-b217-cb9be8f06623" xlink:to="loc_us-gaap_AwardTypeAxis_f1e6c387-2bd3-4ec5-ad3b-271d52c9e213" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f1e6c387-2bd3-4ec5-ad3b-271d52c9e213_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_f1e6c387-2bd3-4ec5-ad3b-271d52c9e213" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f1e6c387-2bd3-4ec5-ad3b-271d52c9e213_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61984c03-0c90-40f9-89f6-42fb75af2e0c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_f1e6c387-2bd3-4ec5-ad3b-271d52c9e213" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61984c03-0c90-40f9-89f6-42fb75af2e0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_7d3c124c-ccf7-40c8-81a0-d981cf5ca6c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61984c03-0c90-40f9-89f6-42fb75af2e0c" xlink:to="loc_us-gaap_EmployeeStockMember_7d3c124c-ccf7-40c8-81a0-d981cf5ca6c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_6641cd1d-3213-40c9-ab9b-fe805fe07d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61984c03-0c90-40f9-89f6-42fb75af2e0c" xlink:to="loc_us-gaap_EmployeeStockOptionMember_6641cd1d-3213-40c9-ab9b-fe805fe07d7a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/StockOptionBlackScholesOptionPricingModelAssumptionsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#StockOptionBlackScholesOptionPricingModelAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockOptionBlackScholesOptionPricingModelAssumptionsDetails" xlink:type="extended" id="ib0047bade14846c99c5ebd1a25557a90_StockOptionBlackScholesOptionPricingModelAssumptionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_81d712a2-8753-42c5-8428-f4bd19472ef2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_a0279a22-8ce2-4f18-8251-baa3280094a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_81d712a2-8753-42c5-8428-f4bd19472ef2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_a0279a22-8ce2-4f18-8251-baa3280094a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_f098d8a7-9d7d-4a86-a7aa-b80ab8f9f4f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_81d712a2-8753-42c5-8428-f4bd19472ef2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_f098d8a7-9d7d-4a86-a7aa-b80ab8f9f4f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_18205ff7-a44d-4350-a801-e3baee4b2ace" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_81d712a2-8753-42c5-8428-f4bd19472ef2" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_18205ff7-a44d-4350-a801-e3baee4b2ace" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_fb2a11cb-5400-4756-a235-03e9ffbd8f78" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_81d712a2-8753-42c5-8428-f4bd19472ef2" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_fb2a11cb-5400-4756-a235-03e9ffbd8f78" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_fa488e83-ceb8-4e6f-998c-114f6910198a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_fb2a11cb-5400-4756-a235-03e9ffbd8f78" xlink:to="loc_us-gaap_AwardTypeAxis_fa488e83-ceb8-4e6f-998c-114f6910198a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fa488e83-ceb8-4e6f-998c-114f6910198a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_fa488e83-ceb8-4e6f-998c-114f6910198a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fa488e83-ceb8-4e6f-998c-114f6910198a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c2a84ab1-2820-4116-af58-3cbfd61afdce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_fa488e83-ceb8-4e6f-998c-114f6910198a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c2a84ab1-2820-4116-af58-3cbfd61afdce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_a7ad87ef-3615-4c7b-bdd3-836aab37718b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c2a84ab1-2820-4116-af58-3cbfd61afdce" xlink:to="loc_us-gaap_EmployeeStockOptionMember_a7ad87ef-3615-4c7b-bdd3-836aab37718b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationRestrictedStockUnitsSummaryDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#StockBasedCompensationRestrictedStockUnitsSummaryDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationRestrictedStockUnitsSummaryDetails" xlink:type="extended" id="i8c309d9ecb8948f291ae3b12e41dafa8_StockBasedCompensationRestrictedStockUnitsSummaryDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_49b70373-e059-4291-b08f-f2cc7455f566" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_79b2e727-942d-41dc-b0da-2630f06bbe88" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_49b70373-e059-4291-b08f-f2cc7455f566" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_79b2e727-942d-41dc-b0da-2630f06bbe88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_d242198a-6572-406b-99da-2b1f2c8b808a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_79b2e727-942d-41dc-b0da-2630f06bbe88" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_d242198a-6572-406b-99da-2b1f2c8b808a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6233cf6b-7140-4349-8a2e-8b49941691de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_79b2e727-942d-41dc-b0da-2630f06bbe88" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6233cf6b-7140-4349-8a2e-8b49941691de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_cbde2b3f-fed0-4340-8d90-a740413344b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_79b2e727-942d-41dc-b0da-2630f06bbe88" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_cbde2b3f-fed0-4340-8d90-a740413344b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_97c67ee1-66ca-4bb3-9b54-ad45bbbc33cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_79b2e727-942d-41dc-b0da-2630f06bbe88" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_97c67ee1-66ca-4bb3-9b54-ad45bbbc33cb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e7bad8c4-463d-4676-9d25-0bcb2fce4a47" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fb34ab3a-bb45-4cb1-b84b-3ae21cf67a8a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_49b70373-e059-4291-b08f-f2cc7455f566" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fb34ab3a-bb45-4cb1-b84b-3ae21cf67a8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_7d58fbf2-a8f2-44b0-bf4a-dea46f10870b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fb34ab3a-bb45-4cb1-b84b-3ae21cf67a8a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_7d58fbf2-a8f2-44b0-bf4a-dea46f10870b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_714b1d3c-d926-466f-a9f0-c26b302fd1c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fb34ab3a-bb45-4cb1-b84b-3ae21cf67a8a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_714b1d3c-d926-466f-a9f0-c26b302fd1c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_704ed05f-6904-4671-a7ad-5dc039f81ce9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fb34ab3a-bb45-4cb1-b84b-3ae21cf67a8a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_704ed05f-6904-4671-a7ad-5dc039f81ce9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_d6892306-adeb-4a9c-86ec-a6a96365cbae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_fb34ab3a-bb45-4cb1-b84b-3ae21cf67a8a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_d6892306-adeb-4a9c-86ec-a6a96365cbae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2dfae09c-c5a2-4315-83cb-a9c20669e908" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_580fb643-3225-405c-8bf2-43ec9aa3d5dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_49b70373-e059-4291-b08f-f2cc7455f566" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_580fb643-3225-405c-8bf2-43ec9aa3d5dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f90cb2c2-97eb-48ce-90e0-549bee6899c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_49b70373-e059-4291-b08f-f2cc7455f566" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f90cb2c2-97eb-48ce-90e0-549bee6899c7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_1f3a1eb6-f9f8-403a-975c-ba927bb1bf61" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f90cb2c2-97eb-48ce-90e0-549bee6899c7" xlink:to="loc_us-gaap_PlanNameAxis_1f3a1eb6-f9f8-403a-975c-ba927bb1bf61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_1f3a1eb6-f9f8-403a-975c-ba927bb1bf61_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_1f3a1eb6-f9f8-403a-975c-ba927bb1bf61" xlink:to="loc_us-gaap_PlanNameDomain_1f3a1eb6-f9f8-403a-975c-ba927bb1bf61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_fbfad7c2-4fff-449f-9810-885d9347db21" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_1f3a1eb6-f9f8-403a-975c-ba927bb1bf61" xlink:to="loc_us-gaap_PlanNameDomain_fbfad7c2-4fff-449f-9810-885d9347db21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_LongTermPerformanceRestrictedStockAwardMember_f37461f5-e13c-4f37-afac-6ca66bb73fcd" xlink:href="itri-20220630.xsd#itri_LongTermPerformanceRestrictedStockAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_fbfad7c2-4fff-449f-9810-885d9347db21" xlink:to="loc_itri_LongTermPerformanceRestrictedStockAwardMember_f37461f5-e13c-4f37-afac-6ca66bb73fcd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_1a5e85c9-8349-41c4-8a6d-3164b172fd42" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f90cb2c2-97eb-48ce-90e0-549bee6899c7" xlink:to="loc_us-gaap_VestingAxis_1a5e85c9-8349-41c4-8a6d-3164b172fd42" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_1a5e85c9-8349-41c4-8a6d-3164b172fd42_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_1a5e85c9-8349-41c4-8a6d-3164b172fd42" xlink:to="loc_us-gaap_VestingDomain_1a5e85c9-8349-41c4-8a6d-3164b172fd42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_f5b42d68-14b1-4cb4-b8d6-39e145cfb1ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_1a5e85c9-8349-41c4-8a6d-3164b172fd42" xlink:to="loc_us-gaap_VestingDomain_f5b42d68-14b1-4cb4-b8d6-39e145cfb1ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_VestedAndReleasedMember_94cc6554-1773-44b0-96b4-4c8e10df5f5f" xlink:href="itri-20220630.xsd#itri_VestedAndReleasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_f5b42d68-14b1-4cb4-b8d6-39e145cfb1ae" xlink:to="loc_itri_VestedAndReleasedMember_94cc6554-1773-44b0-96b4-4c8e10df5f5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_VestedButNotReleasedMember_8a3b25f1-d6ba-4ab9-902d-cc9cccca7c6f" xlink:href="itri-20220630.xsd#itri_VestedButNotReleasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_f5b42d68-14b1-4cb4-b8d6-39e145cfb1ae" xlink:to="loc_itri_VestedButNotReleasedMember_8a3b25f1-d6ba-4ab9-902d-cc9cccca7c6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_bc8ff2fc-8b0c-4e2d-badd-599cef8a5f9f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f90cb2c2-97eb-48ce-90e0-549bee6899c7" xlink:to="loc_us-gaap_AwardTypeAxis_bc8ff2fc-8b0c-4e2d-badd-599cef8a5f9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bc8ff2fc-8b0c-4e2d-badd-599cef8a5f9f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_bc8ff2fc-8b0c-4e2d-badd-599cef8a5f9f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bc8ff2fc-8b0c-4e2d-badd-599cef8a5f9f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fa5ea87a-c25c-4fe4-ad49-eb1b75fded98" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_bc8ff2fc-8b0c-4e2d-badd-599cef8a5f9f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fa5ea87a-c25c-4fe4-ad49-eb1b75fded98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_aec2d72f-1644-4138-a598-a20df4b3e247" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fa5ea87a-c25c-4fe4-ad49-eb1b75fded98" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_aec2d72f-1644-4138-a598-a20df4b3e247" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationLongTermPerformanceRestrictedStockUnitAwardMonteCarloPricingModelAssumptionsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#StockBasedCompensationLongTermPerformanceRestrictedStockUnitAwardMonteCarloPricingModelAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationLongTermPerformanceRestrictedStockUnitAwardMonteCarloPricingModelAssumptionsDetails" xlink:type="extended" id="id6a5fee4df12418286cf2587a4439af8_StockBasedCompensationLongTermPerformanceRestrictedStockUnitAwardMonteCarloPricingModelAssumptionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_954831ee-d57d-4a7c-bd64-056f4e62e833" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_54133102-657b-4d31-9446-443954ec075c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_954831ee-d57d-4a7c-bd64-056f4e62e833" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_54133102-657b-4d31-9446-443954ec075c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_3eaad311-ecf0-4eac-8c9b-cc975e6e007f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_954831ee-d57d-4a7c-bd64-056f4e62e833" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_3eaad311-ecf0-4eac-8c9b-cc975e6e007f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_0ce0a255-5996-4e9f-8ebc-aef10ca40f5c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_954831ee-d57d-4a7c-bd64-056f4e62e833" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_0ce0a255-5996-4e9f-8ebc-aef10ca40f5c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_833418b0-1e15-4294-9f1c-b4d61ab31472" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_954831ee-d57d-4a7c-bd64-056f4e62e833" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_833418b0-1e15-4294-9f1c-b4d61ab31472" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0f92a325-cb77-455b-8567-f055a0c61e33" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_954831ee-d57d-4a7c-bd64-056f4e62e833" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0f92a325-cb77-455b-8567-f055a0c61e33" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_f02d0c14-5204-49c7-817a-3406f7886bd2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0f92a325-cb77-455b-8567-f055a0c61e33" xlink:to="loc_us-gaap_AwardTypeAxis_f02d0c14-5204-49c7-817a-3406f7886bd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f02d0c14-5204-49c7-817a-3406f7886bd2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_f02d0c14-5204-49c7-817a-3406f7886bd2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f02d0c14-5204-49c7-817a-3406f7886bd2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4d5a3da8-0d57-46eb-8d45-ef7471c4ad7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_f02d0c14-5204-49c7-817a-3406f7886bd2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4d5a3da8-0d57-46eb-8d45-ef7471c4ad7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_0e9a344d-b0c5-4b53-8baf-1a92b2ee5c11" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4d5a3da8-0d57-46eb-8d45-ef7471c4ad7e" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_0e9a344d-b0c5-4b53-8baf-1a92b2ee5c11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_e106308f-eea1-4571-bb1e-8a9cad308ae0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0f92a325-cb77-455b-8567-f055a0c61e33" xlink:to="loc_us-gaap_PlanNameAxis_e106308f-eea1-4571-bb1e-8a9cad308ae0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e106308f-eea1-4571-bb1e-8a9cad308ae0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_e106308f-eea1-4571-bb1e-8a9cad308ae0" xlink:to="loc_us-gaap_PlanNameDomain_e106308f-eea1-4571-bb1e-8a9cad308ae0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_3f186585-0df0-4099-9fb8-2c8817ec14ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_e106308f-eea1-4571-bb1e-8a9cad308ae0" xlink:to="loc_us-gaap_PlanNameDomain_3f186585-0df0-4099-9fb8-2c8817ec14ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_LongTermPerformanceRestrictedStockAwardMember_81eb395c-d2f5-4151-8dc9-0f13674996dd" xlink:href="itri-20220630.xsd#itri_LongTermPerformanceRestrictedStockAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_3f186585-0df0-4099-9fb8-2c8817ec14ff" xlink:to="loc_itri_LongTermPerformanceRestrictedStockAwardMember_81eb395c-d2f5-4151-8dc9-0f13674996dd" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended" id="id8385e2314f74bbaaa34301603887c66_StockBasedCompensationNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_7d14bf1a-8d13-40ae-bfcc-154c15dd4fb5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_09604215-c3da-4571-9117-4d24b7ba222c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_7d14bf1a-8d13-40ae-bfcc-154c15dd4fb5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_09604215-c3da-4571-9117-4d24b7ba222c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_a18d7f6c-5e35-4338-a05d-723a1309feeb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_7d14bf1a-8d13-40ae-bfcc-154c15dd4fb5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_a18d7f6c-5e35-4338-a05d-723a1309feeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_Authorizedsharereservereductioninstockoptionsorshareappreciationrightsavailableforissueconversionratio_de509423-dcbe-47be-9ed9-74b3ade654c9" xlink:href="itri-20220630.xsd#itri_Authorizedsharereservereductioninstockoptionsorshareappreciationrightsavailableforissueconversionratio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_7d14bf1a-8d13-40ae-bfcc-154c15dd4fb5" xlink:to="loc_itri_Authorizedsharereservereductioninstockoptionsorshareappreciationrightsavailableforissueconversionratio_de509423-dcbe-47be-9ed9-74b3ade654c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_Authorizedsharereservereductioninawardsotherthanstockoptionsorshareappreciationrightsavailableforissueconversionratio_490bf1aa-6176-420f-a39d-5c25ee41525e" xlink:href="itri-20220630.xsd#itri_Authorizedsharereservereductioninawardsotherthanstockoptionsorshareappreciationrightsavailableforissueconversionratio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_7d14bf1a-8d13-40ae-bfcc-154c15dd4fb5" xlink:to="loc_itri_Authorizedsharereservereductioninawardsotherthanstockoptionsorshareappreciationrightsavailableforissueconversionratio_490bf1aa-6176-420f-a39d-5c25ee41525e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_ea07d8d1-97d9-4ad9-b819-640cce40d639" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_7d14bf1a-8d13-40ae-bfcc-154c15dd4fb5" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_ea07d8d1-97d9-4ad9-b819-640cce40d639" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_0f3fc4e6-d481-4bfa-9236-0197caa85a71" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_7d14bf1a-8d13-40ae-bfcc-154c15dd4fb5" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_0f3fc4e6-d481-4bfa-9236-0197caa85a71" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_50e26152-1beb-42be-ad24-2d9850192766" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_7d14bf1a-8d13-40ae-bfcc-154c15dd4fb5" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_50e26152-1beb-42be-ad24-2d9850192766" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_5a01df25-5929-4b3c-9f74-7180a5dae0a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_50e26152-1beb-42be-ad24-2d9850192766" xlink:to="loc_us-gaap_PlanNameAxis_5a01df25-5929-4b3c-9f74-7180a5dae0a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_5a01df25-5929-4b3c-9f74-7180a5dae0a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_5a01df25-5929-4b3c-9f74-7180a5dae0a6" xlink:to="loc_us-gaap_PlanNameDomain_5a01df25-5929-4b3c-9f74-7180a5dae0a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_5f333088-d815-4b26-b8ec-b95d820687dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_5a01df25-5929-4b3c-9f74-7180a5dae0a6" xlink:to="loc_us-gaap_PlanNameDomain_5f333088-d815-4b26-b8ec-b95d820687dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_LongTermPerformanceRestrictedStockAwardMember_f8fa6900-7ad2-4d12-b261-5c438001b710" xlink:href="itri-20220630.xsd#itri_LongTermPerformanceRestrictedStockAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_5f333088-d815-4b26-b8ec-b95d820687dc" xlink:to="loc_itri_LongTermPerformanceRestrictedStockAwardMember_f8fa6900-7ad2-4d12-b261-5c438001b710" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_StockIncentivePlanMember_9f130c1d-9a09-4e75-9150-805e13457700" xlink:href="itri-20220630.xsd#itri_StockIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_5f333088-d815-4b26-b8ec-b95d820687dc" xlink:to="loc_itri_StockIncentivePlanMember_9f130c1d-9a09-4e75-9150-805e13457700" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_46b88e49-efcd-4a07-9fc6-f9f63093f2a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_50e26152-1beb-42be-ad24-2d9850192766" xlink:to="loc_us-gaap_AwardTypeAxis_46b88e49-efcd-4a07-9fc6-f9f63093f2a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_46b88e49-efcd-4a07-9fc6-f9f63093f2a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_46b88e49-efcd-4a07-9fc6-f9f63093f2a2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_46b88e49-efcd-4a07-9fc6-f9f63093f2a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_626faa6d-420e-4a62-871b-ff862510231a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_46b88e49-efcd-4a07-9fc6-f9f63093f2a2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_626faa6d-420e-4a62-871b-ff862510231a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_858f2b9b-90fd-4bca-ba26-b054c8cb8125" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_626faa6d-420e-4a62-871b-ff862510231a" xlink:to="loc_us-gaap_EmployeeStockOptionMember_858f2b9b-90fd-4bca-ba26-b054c8cb8125" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_LongTermPerformanceRestrictedStockAwardMember_ad2bd8d6-0046-4709-b7b5-08d78509f2d1" xlink:href="itri-20220630.xsd#itri_LongTermPerformanceRestrictedStockAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_626faa6d-420e-4a62-871b-ff862510231a" xlink:to="loc_itri_LongTermPerformanceRestrictedStockAwardMember_ad2bd8d6-0046-4709-b7b5-08d78509f2d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_4bb0fd04-be9f-410e-8d23-24b3e3cbb438" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_626faa6d-420e-4a62-871b-ff862510231a" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_4bb0fd04-be9f-410e-8d23-24b3e3cbb438" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_bd92c8a0-2fdb-48f2-9d34-2006327112f2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_626faa6d-420e-4a62-871b-ff862510231a" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_bd92c8a0-2fdb-48f2-9d34-2006327112f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_6395ad8b-e892-4eb8-bbcb-6b3818b65b72" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_626faa6d-420e-4a62-871b-ff862510231a" xlink:to="loc_us-gaap_EmployeeStockMember_6395ad8b-e892-4eb8-bbcb-6b3818b65b72" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" id="ifb4f18771dc5474f94f798226decd051_IncomeTaxesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_af89ca70-5aca-4856-bd87-f6ef30b63ad4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_04b40a1c-bdf7-4c0c-aa75-c11da953a916" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_af89ca70-5aca-4856-bd87-f6ef30b63ad4" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_04b40a1c-bdf7-4c0c-aa75-c11da953a916" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_5540c659-11be-45d0-98ed-bcec95e6d64a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_af89ca70-5aca-4856-bd87-f6ef30b63ad4" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_5540c659-11be-45d0-98ed-bcec95e6d64a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_0e2f97e3-4992-4f87-b1dd-f74ec1ce2df5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_af89ca70-5aca-4856-bd87-f6ef30b63ad4" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_0e2f97e3-4992-4f87-b1dd-f74ec1ce2df5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_75de2e47-9f1b-4ee2-a4e3-402e64d40d35" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_0e2f97e3-4992-4f87-b1dd-f74ec1ce2df5" xlink:to="loc_srt_RangeAxis_75de2e47-9f1b-4ee2-a4e3-402e64d40d35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_75de2e47-9f1b-4ee2-a4e3-402e64d40d35_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_75de2e47-9f1b-4ee2-a4e3-402e64d40d35" xlink:to="loc_srt_RangeMember_75de2e47-9f1b-4ee2-a4e3-402e64d40d35_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d3841cb9-0e56-45ca-a9e6-3ebfc798bddd" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_75de2e47-9f1b-4ee2-a4e3-402e64d40d35" xlink:to="loc_srt_RangeMember_d3841cb9-0e56-45ca-a9e6-3ebfc798bddd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d2241a67-f04a-42df-b04e-31527f2516be" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d3841cb9-0e56-45ca-a9e6-3ebfc798bddd" xlink:to="loc_srt_MinimumMember_d2241a67-f04a-42df-b04e-31527f2516be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_8225c8ce-8c5d-4fe4-8098-cfc0f898e2ef" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d3841cb9-0e56-45ca-a9e6-3ebfc798bddd" xlink:to="loc_srt_MaximumMember_8225c8ce-8c5d-4fe4-8098-cfc0f898e2ef" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/CommitmentsandContingenciesAvailableLinesofCreditOutstandingStandbyLetterofCreditsandBondsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#CommitmentsandContingenciesAvailableLinesofCreditOutstandingStandbyLetterofCreditsandBondsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/CommitmentsandContingenciesAvailableLinesofCreditOutstandingStandbyLetterofCreditsandBondsDetails" xlink:type="extended" id="ie38199017fb44de58f74612debe6c93a_CommitmentsandContingenciesAvailableLinesofCreditOutstandingStandbyLetterofCreditsandBondsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_cc42a7a2-ccf4-4682-8909-4aa2d8251839" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_9ef035f2-b96c-4a15-90d6-aec94268f8fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cc42a7a2-ccf4-4682-8909-4aa2d8251839" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_9ef035f2-b96c-4a15-90d6-aec94268f8fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_417b7bec-7adf-4e59-a018-5ca429b1c96b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cc42a7a2-ccf4-4682-8909-4aa2d8251839" xlink:to="loc_us-gaap_LineOfCredit_417b7bec-7adf-4e59-a018-5ca429b1c96b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_d7da843e-9342-47f6-92fb-c3c25ada9c0d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cc42a7a2-ccf4-4682-8909-4aa2d8251839" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_d7da843e-9342-47f6-92fb-c3c25ada9c0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_417080d8-e201-4ef6-81a7-980b9c03600a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cc42a7a2-ccf4-4682-8909-4aa2d8251839" xlink:to="loc_us-gaap_ShortTermBorrowings_417080d8-e201-4ef6-81a7-980b9c03600a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_f8b63b51-3e49-4806-9eae-6f34113214b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cc42a7a2-ccf4-4682-8909-4aa2d8251839" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_f8b63b51-3e49-4806-9eae-6f34113214b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_LineofCreditFacilityRemainingcapacitytosupportlettersofcredit_803eef56-efef-415a-a270-194ec966a4f7" xlink:href="itri-20220630.xsd#itri_LineofCreditFacilityRemainingcapacitytosupportlettersofcredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cc42a7a2-ccf4-4682-8909-4aa2d8251839" xlink:to="loc_itri_LineofCreditFacilityRemainingcapacitytosupportlettersofcredit_803eef56-efef-415a-a270-194ec966a4f7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_0493fd3c-34c8-4179-b17d-70fc2231dac7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cc42a7a2-ccf4-4682-8909-4aa2d8251839" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_0493fd3c-34c8-4179-b17d-70fc2231dac7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_650f9c47-1920-488b-877a-34dea66a826f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cc42a7a2-ccf4-4682-8909-4aa2d8251839" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_650f9c47-1920-488b-877a-34dea66a826f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_63d07ab3-2f34-4091-8f0b-c6afea524042" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_650f9c47-1920-488b-877a-34dea66a826f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_63d07ab3-2f34-4091-8f0b-c6afea524042" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_63d07ab3-2f34-4091-8f0b-c6afea524042_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_63d07ab3-2f34-4091-8f0b-c6afea524042" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_63d07ab3-2f34-4091-8f0b-c6afea524042_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fd4f1ec9-2635-4e76-83d6-2d5f5cc0af84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_63d07ab3-2f34-4091-8f0b-c6afea524042" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fd4f1ec9-2635-4e76-83d6-2d5f5cc0af84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_9a2e6ba9-65b7-46e4-a6f2-34cb5d14ee5b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fd4f1ec9-2635-4e76-83d6-2d5f5cc0af84" xlink:to="loc_us-gaap_LineOfCreditMember_9a2e6ba9-65b7-46e4-a6f2-34cb5d14ee5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_3f384b1a-16ea-449d-b529-e3e7990f4ad2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_650f9c47-1920-488b-877a-34dea66a826f" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_3f384b1a-16ea-449d-b529-e3e7990f4ad2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_3f384b1a-16ea-449d-b529-e3e7990f4ad2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_3f384b1a-16ea-449d-b529-e3e7990f4ad2" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_3f384b1a-16ea-449d-b529-e3e7990f4ad2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_6fe4a0af-a00d-4c3f-ae81-2041673548d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_3f384b1a-16ea-449d-b529-e3e7990f4ad2" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_6fe4a0af-a00d-4c3f-ae81-2041673548d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SuretyBondMember_f5cd0a1e-0e88-47fc-be02-503e70cd7b64" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SuretyBondMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_6fe4a0af-a00d-4c3f-ae81-2041673548d9" xlink:to="loc_us-gaap_SuretyBondMember_f5cd0a1e-0e88-47fc-be02-503e70cd7b64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f4a82465-374d-4d2d-b1cd-7d3e586e3acc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_650f9c47-1920-488b-877a-34dea66a826f" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f4a82465-374d-4d2d-b1cd-7d3e586e3acc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_f4a82465-374d-4d2d-b1cd-7d3e586e3acc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f4a82465-374d-4d2d-b1cd-7d3e586e3acc" xlink:to="loc_us-gaap_LossContingencyNatureDomain_f4a82465-374d-4d2d-b1cd-7d3e586e3acc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_831518ac-c5ef-4c5f-afb5-8a291086ca69" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f4a82465-374d-4d2d-b1cd-7d3e586e3acc" xlink:to="loc_us-gaap_LossContingencyNatureDomain_831518ac-c5ef-4c5f-afb5-8a291086ca69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_CreditFacilityMember_2ab4fb73-dd0b-4af2-9852-183fd5fad865" xlink:href="itri-20220630.xsd#itri_CreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_831518ac-c5ef-4c5f-afb5-8a291086ca69" xlink:to="loc_itri_CreditFacilityMember_2ab4fb73-dd0b-4af2-9852-183fd5fad865" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_UnsecuredMulticurrencyRevolvingLinesOfCreditMember_aefb4e61-f74b-427d-9c3b-e38553c68d05" xlink:href="itri-20220630.xsd#itri_UnsecuredMulticurrencyRevolvingLinesOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_831518ac-c5ef-4c5f-afb5-8a291086ca69" xlink:to="loc_itri_UnsecuredMulticurrencyRevolvingLinesOfCreditMember_aefb4e61-f74b-427d-9c3b-e38553c68d05" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/RestructuringExpectedCosts2021ProjectsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#RestructuringExpectedCosts2021ProjectsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/RestructuringExpectedCosts2021ProjectsDetails" xlink:type="extended" id="i8d399bc3b8a24a28a3a13dd8f7e58bd7_RestructuringExpectedCosts2021ProjectsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_c6b26aaa-5a41-440a-9989-584438c3c11f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_4d914af8-5683-47d6-9c1c-76f62b4106ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c6b26aaa-5a41-440a-9989-584438c3c11f" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_4d914af8-5683-47d6-9c1c-76f62b4106ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_1407ef98-12a8-4f44-a7f7-5c37eb2918ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c6b26aaa-5a41-440a-9989-584438c3c11f" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_1407ef98-12a8-4f44-a7f7-5c37eb2918ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_0d464266-60ff-4e2d-942e-3242eb10fdf4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c6b26aaa-5a41-440a-9989-584438c3c11f" xlink:to="loc_us-gaap_RestructuringCharges_0d464266-60ff-4e2d-942e-3242eb10fdf4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_5ab5f1a2-2a15-47cb-933b-bbdd512af246" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c6b26aaa-5a41-440a-9989-584438c3c11f" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_5ab5f1a2-2a15-47cb-933b-bbdd512af246" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b573a023-f2dd-4b90-9486-c3397a18bedd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c6b26aaa-5a41-440a-9989-584438c3c11f" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b573a023-f2dd-4b90-9486-c3397a18bedd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_0af2683c-facb-4b04-874b-86578514cd41" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b573a023-f2dd-4b90-9486-c3397a18bedd" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_0af2683c-facb-4b04-874b-86578514cd41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_0af2683c-facb-4b04-874b-86578514cd41_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_0af2683c-facb-4b04-874b-86578514cd41" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_0af2683c-facb-4b04-874b-86578514cd41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_72af7212-1d80-4f43-b512-fe8f44273726" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_0af2683c-facb-4b04-874b-86578514cd41" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_72af7212-1d80-4f43-b512-fe8f44273726" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_5808dec1-b35e-41fb-ab54-31c97c83c32b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_72af7212-1d80-4f43-b512-fe8f44273726" xlink:to="loc_us-gaap_EmployeeSeveranceMember_5808dec1-b35e-41fb-ab54-31c97c83c32b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_1cca0c6e-8890-49e4-87bb-a795310a2a01" xlink:href="itri-20220630.xsd#itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_72af7212-1d80-4f43-b512-fe8f44273726" xlink:to="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_1cca0c6e-8890-49e4-87bb-a795310a2a01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_e35880da-67d2-4236-b6a5-04a72ad6513e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_72af7212-1d80-4f43-b512-fe8f44273726" xlink:to="loc_us-gaap_OtherRestructuringMember_e35880da-67d2-4236-b6a5-04a72ad6513e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_7758e713-952c-4fb2-b0ce-636caba9307e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b573a023-f2dd-4b90-9486-c3397a18bedd" xlink:to="loc_us-gaap_RestructuringPlanAxis_7758e713-952c-4fb2-b0ce-636caba9307e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_7758e713-952c-4fb2-b0ce-636caba9307e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_7758e713-952c-4fb2-b0ce-636caba9307e" xlink:to="loc_us-gaap_RestructuringPlanDomain_7758e713-952c-4fb2-b0ce-636caba9307e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_284966d4-0092-4cc7-8253-cf83eb8ca846" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_7758e713-952c-4fb2-b0ce-636caba9307e" xlink:to="loc_us-gaap_RestructuringPlanDomain_284966d4-0092-4cc7-8253-cf83eb8ca846" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_A2021ProjectsMember_e2ebff29-9e41-468e-a727-b3a21ba7708a" xlink:href="itri-20220630.xsd#itri_A2021ProjectsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_284966d4-0092-4cc7-8253-cf83eb8ca846" xlink:to="loc_itri_A2021ProjectsMember_e2ebff29-9e41-468e-a727-b3a21ba7708a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/RestructuringExpectedCosts2020ProjectsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#RestructuringExpectedCosts2020ProjectsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/RestructuringExpectedCosts2020ProjectsDetails" xlink:type="extended" id="ia1b393d5ea3a40eba0bd951fd303b4c9_RestructuringExpectedCosts2020ProjectsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_023f8147-72a5-4b2d-8c7f-bab437b9e07b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_d278518e-7e20-40f1-a022-509a901f6d82" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_023f8147-72a5-4b2d-8c7f-bab437b9e07b" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_d278518e-7e20-40f1-a022-509a901f6d82" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_ac4b9810-bc0d-4c55-846a-c9fc53d064c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_023f8147-72a5-4b2d-8c7f-bab437b9e07b" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_ac4b9810-bc0d-4c55-846a-c9fc53d064c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_b0851ae8-923d-4051-a66c-97709beb6641" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_023f8147-72a5-4b2d-8c7f-bab437b9e07b" xlink:to="loc_us-gaap_RestructuringCharges_b0851ae8-923d-4051-a66c-97709beb6641" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_1d5a0090-34ad-48bf-bf2e-1b4cb280b6c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_023f8147-72a5-4b2d-8c7f-bab437b9e07b" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_1d5a0090-34ad-48bf-bf2e-1b4cb280b6c7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3c345a0b-5c9d-476f-a59a-88c07db31a87" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_023f8147-72a5-4b2d-8c7f-bab437b9e07b" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3c345a0b-5c9d-476f-a59a-88c07db31a87" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_ecb5a5d0-3582-42c9-bd0a-a18e5f14c58b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3c345a0b-5c9d-476f-a59a-88c07db31a87" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_ecb5a5d0-3582-42c9-bd0a-a18e5f14c58b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_ecb5a5d0-3582-42c9-bd0a-a18e5f14c58b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_ecb5a5d0-3582-42c9-bd0a-a18e5f14c58b" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_ecb5a5d0-3582-42c9-bd0a-a18e5f14c58b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_693404cb-d957-4c44-bb09-428353480bbb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_ecb5a5d0-3582-42c9-bd0a-a18e5f14c58b" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_693404cb-d957-4c44-bb09-428353480bbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_a361364c-725e-481b-888a-b8deb7a53597" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_693404cb-d957-4c44-bb09-428353480bbb" xlink:to="loc_us-gaap_EmployeeSeveranceMember_a361364c-725e-481b-888a-b8deb7a53597" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_b7256793-bd7b-44cf-a577-448b0a6a55c9" xlink:href="itri-20220630.xsd#itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_693404cb-d957-4c44-bb09-428353480bbb" xlink:to="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_b7256793-bd7b-44cf-a577-448b0a6a55c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_6d9cf684-5b19-46d0-9f23-492afa39e930" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_693404cb-d957-4c44-bb09-428353480bbb" xlink:to="loc_us-gaap_OtherRestructuringMember_6d9cf684-5b19-46d0-9f23-492afa39e930" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_3f4a553e-0062-47ed-bebc-15a65b02376e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3c345a0b-5c9d-476f-a59a-88c07db31a87" xlink:to="loc_us-gaap_RestructuringPlanAxis_3f4a553e-0062-47ed-bebc-15a65b02376e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_3f4a553e-0062-47ed-bebc-15a65b02376e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_3f4a553e-0062-47ed-bebc-15a65b02376e" xlink:to="loc_us-gaap_RestructuringPlanDomain_3f4a553e-0062-47ed-bebc-15a65b02376e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_85db8708-120f-40a2-afeb-dfd4df1e41e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_3f4a553e-0062-47ed-bebc-15a65b02376e" xlink:to="loc_us-gaap_RestructuringPlanDomain_85db8708-120f-40a2-afeb-dfd4df1e41e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_A2020ProjectsMember_5ef99e3c-cd0d-4c68-a0ef-bb711d4999a3" xlink:href="itri-20220630.xsd#itri_A2020ProjectsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_85db8708-120f-40a2-afeb-dfd4df1e41e2" xlink:to="loc_itri_A2020ProjectsMember_5ef99e3c-cd0d-4c68-a0ef-bb711d4999a3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/RestructuringAdditionalInformationDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#RestructuringAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/RestructuringAdditionalInformationDetails" xlink:type="extended" id="id66a4aaecde04103badb6e08ab376eee_RestructuringAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_3541ada1-24f8-43d7-baf9-b4b28038833a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveCurrent_79289d26-8ac8-409e-9494-194006dedf7f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserveCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_3541ada1-24f8-43d7-baf9-b4b28038833a" xlink:to="loc_us-gaap_RestructuringReserveCurrent_79289d26-8ac8-409e-9494-194006dedf7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveNoncurrent_4657f0dc-e86a-41ea-9c8f-c347951ffa72" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserveNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_3541ada1-24f8-43d7-baf9-b4b28038833a" xlink:to="loc_us-gaap_RestructuringReserveNoncurrent_4657f0dc-e86a-41ea-9c8f-c347951ffa72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_f7d2b957-2366-4f78-8cb3-0f29895664ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_3541ada1-24f8-43d7-baf9-b4b28038833a" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_f7d2b957-2366-4f78-8cb3-0f29895664ed" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_777b67b2-1836-482c-8809-acc042feae2c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_f7d2b957-2366-4f78-8cb3-0f29895664ed" xlink:to="loc_us-gaap_RestructuringPlanAxis_777b67b2-1836-482c-8809-acc042feae2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_777b67b2-1836-482c-8809-acc042feae2c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_777b67b2-1836-482c-8809-acc042feae2c" xlink:to="loc_us-gaap_RestructuringPlanDomain_777b67b2-1836-482c-8809-acc042feae2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_cea7dc10-8ca3-4bd9-9cac-9145d5ce0664" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_777b67b2-1836-482c-8809-acc042feae2c" xlink:to="loc_us-gaap_RestructuringPlanDomain_cea7dc10-8ca3-4bd9-9cac-9145d5ce0664" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_A2020ProjectsMember_d010dbfb-e11b-4936-a815-0df87544070c" xlink:href="itri-20220630.xsd#itri_A2020ProjectsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_cea7dc10-8ca3-4bd9-9cac-9145d5ce0664" xlink:to="loc_itri_A2020ProjectsMember_d010dbfb-e11b-4936-a815-0df87544070c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d046d65d-d778-43c7-b9e0-de246de9db09" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_f7d2b957-2366-4f78-8cb3-0f29895664ed" xlink:to="loc_srt_RangeAxis_d046d65d-d778-43c7-b9e0-de246de9db09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d046d65d-d778-43c7-b9e0-de246de9db09_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d046d65d-d778-43c7-b9e0-de246de9db09" xlink:to="loc_srt_RangeMember_d046d65d-d778-43c7-b9e0-de246de9db09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9f3413a0-ffb4-44d2-bc4a-f218218b4afa" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d046d65d-d778-43c7-b9e0-de246de9db09" xlink:to="loc_srt_RangeMember_9f3413a0-ffb4-44d2-bc4a-f218218b4afa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_72c17209-04fe-4f12-ae8b-a442b6453511" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_9f3413a0-ffb4-44d2-bc4a-f218218b4afa" xlink:to="loc_srt_MinimumMember_72c17209-04fe-4f12-ae8b-a442b6453511" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_da97aa89-601c-4ef8-9111-5286d64ec59f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_9f3413a0-ffb4-44d2-bc4a-f218218b4afa" xlink:to="loc_srt_MaximumMember_da97aa89-601c-4ef8-9111-5286d64ec59f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/RestructuringRelatedBalanceSheetActivityDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#RestructuringRelatedBalanceSheetActivityDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/RestructuringRelatedBalanceSheetActivityDetails" xlink:type="extended" id="ie1ab5f0a3f6e4263a5d5ae1e4da256d4_RestructuringRelatedBalanceSheetActivityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_1894e28c-9e93-4039-b141-a95628bb4564" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_37143921-4c75-44f6-9280-da55c53b1d80" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1894e28c-9e93-4039-b141-a95628bb4564" xlink:to="loc_us-gaap_RestructuringReserve_37143921-4c75-44f6-9280-da55c53b1d80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_472404bf-99fc-483a-81a3-62c9e13afa93" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1894e28c-9e93-4039-b141-a95628bb4564" xlink:to="loc_us-gaap_RestructuringCharges_472404bf-99fc-483a-81a3-62c9e13afa93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_8d506c52-cb5d-4629-af87-1ea2dd9e3a27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1894e28c-9e93-4039-b141-a95628bb4564" xlink:to="loc_us-gaap_PaymentsForRestructuring_8d506c52-cb5d-4629-af87-1ea2dd9e3a27" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_CashReceiptsFromRestructuring_08e13594-ff16-4d68-93d5-573924c303e2" xlink:href="itri-20220630.xsd#itri_CashReceiptsFromRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1894e28c-9e93-4039-b141-a95628bb4564" xlink:to="loc_itri_CashReceiptsFromRestructuring_08e13594-ff16-4d68-93d5-573924c303e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_0358915e-b825-416e-84e3-fdf7ae4d8acd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1894e28c-9e93-4039-b141-a95628bb4564" xlink:to="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_0358915e-b825-416e-84e3-fdf7ae4d8acd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveTranslationAdjustment_b9400f9c-aa57-4dcc-a152-dfb8595ef369" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserveTranslationAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1894e28c-9e93-4039-b141-a95628bb4564" xlink:to="loc_us-gaap_RestructuringReserveTranslationAdjustment_b9400f9c-aa57-4dcc-a152-dfb8595ef369" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_c935a093-99b5-4e4b-baa3-6d4c780d883e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserve"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ad6114ad-ca26-4938-8cd4-69d7937ba53d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_1894e28c-9e93-4039-b141-a95628bb4564" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ad6114ad-ca26-4938-8cd4-69d7937ba53d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_c9c32160-49b1-40eb-a215-904bd66fa90c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ad6114ad-ca26-4938-8cd4-69d7937ba53d" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_c9c32160-49b1-40eb-a215-904bd66fa90c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_c9c32160-49b1-40eb-a215-904bd66fa90c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_c9c32160-49b1-40eb-a215-904bd66fa90c" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_c9c32160-49b1-40eb-a215-904bd66fa90c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_a48eb263-d4c8-44e2-823c-524cfeab723e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_c9c32160-49b1-40eb-a215-904bd66fa90c" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_a48eb263-d4c8-44e2-823c-524cfeab723e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_5682f1a1-5d24-4246-97f5-48c23ae20cad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_a48eb263-d4c8-44e2-823c-524cfeab723e" xlink:to="loc_us-gaap_EmployeeSeveranceMember_5682f1a1-5d24-4246-97f5-48c23ae20cad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_f767cdc5-7221-47b3-92f0-459f3555a7db" xlink:href="itri-20220630.xsd#itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_a48eb263-d4c8-44e2-823c-524cfeab723e" xlink:to="loc_itri_AssetImpairmentAndNetGainLossOnSaleOrDisposalMember_f767cdc5-7221-47b3-92f0-459f3555a7db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_0abec582-9433-4207-810e-cc026fb8858b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_a48eb263-d4c8-44e2-823c-524cfeab723e" xlink:to="loc_us-gaap_OtherRestructuringMember_0abec582-9433-4207-810e-cc026fb8858b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/ShareholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#ShareholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/ShareholdersEquityNarrativeDetails" xlink:type="extended" id="i632d6ba5e5e547138dfab8e5ff0ab1f4_ShareholdersEquityNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_ffa92a0f-4722-4e9d-9221-4f0218df4f06" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_ffa92a0f-4722-4e9d-9221-4f0218df4f06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockNoParValue_f48c24d8-865f-4ae8-b429-8d03e1fa6bc9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockNoParValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_PreferredStockNoParValue_f48c24d8-865f-4ae8-b429-8d03e1fa6bc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_687863ed-c45a-4f52-a13b-3e5b5e3e22a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_PreferredStockSharesIssued_687863ed-c45a-4f52-a13b-3e5b5e3e22a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_7d03c01d-c608-48d7-b385-ddb33afad7f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_7d03c01d-c608-48d7-b385-ddb33afad7f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_a9c47989-d084-456a-9d57-f4ae326d855c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_a9c47989-d084-456a-9d57-f4ae326d855c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_4620bb55-49f0-472b-ba9d-9ae5369b9a00" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_4620bb55-49f0-472b-ba9d-9ae5369b9a00" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_f935008b-dd1e-4f57-a88a-ab604a8c8fa1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_f935008b-dd1e-4f57-a88a-ab604a8c8fa1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_49eda933-04a8-4f89-9af4-93a0c3d10410" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_49eda933-04a8-4f89-9af4-93a0c3d10410" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_0d62a2ca-9b89-4cb0-954b-e5cacacbc397" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_DerivativeNotionalAmount_0d62a2ca-9b89-4cb0-954b-e5cacacbc397" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_22b35c18-91da-4288-8d1c-44e970539379" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_22b35c18-91da-4288-8d1c-44e970539379" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_CommonStockConversionPrice_a3ccdd0f-97a2-449b-8c43-ebf4865676d3" xlink:href="itri-20220630.xsd#itri_CommonStockConversionPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_itri_CommonStockConversionPrice_a3ccdd0f-97a2-449b-8c43-ebf4865676d3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsDerivativeInstruments_bca9af01-85c8-4049-a7aa-cfdccb899c5e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsDerivativeInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_DeferredTaxAssetsDerivativeInstruments_bca9af01-85c8-4049-a7aa-cfdccb899c5e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_ef225060-8231-4b67-8e08-7d81f18e6947" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_ef225060-8231-4b67-8e08-7d81f18e6947" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_37e6d9be-8596-4491-95a1-f75276b01d7d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_37e6d9be-8596-4491-95a1-f75276b01d7d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_ClassOfWarrantOrRightPremiumPercentage_c094d7a6-b208-4b40-b222-0905a3d75d0a" xlink:href="itri-20220630.xsd#itri_ClassOfWarrantOrRightPremiumPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_itri_ClassOfWarrantOrRightPremiumPercentage_c094d7a6-b208-4b40-b222-0905a3d75d0a" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_ClassOfWarrantOrRightAggregateProceedsFromTransaction_6294f42e-68cb-4e6e-b786-40835003507a" xlink:href="itri-20220630.xsd#itri_ClassOfWarrantOrRightAggregateProceedsFromTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_itri_ClassOfWarrantOrRightAggregateProceedsFromTransaction_6294f42e-68cb-4e6e-b786-40835003507a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9f7a553c-013c-47cf-b76e-356c6295c60a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e013af64-2b31-43b9-ae12-04fbcd58490f" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9f7a553c-013c-47cf-b76e-356c6295c60a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_7b881814-8bf0-4959-84ca-2a4468cc80dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9f7a553c-013c-47cf-b76e-356c6295c60a" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_7b881814-8bf0-4959-84ca-2a4468cc80dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_7b881814-8bf0-4959-84ca-2a4468cc80dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_7b881814-8bf0-4959-84ca-2a4468cc80dc" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_7b881814-8bf0-4959-84ca-2a4468cc80dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_e90bf0b3-532a-4810-a9ce-79952d333173" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_7b881814-8bf0-4959-84ca-2a4468cc80dc" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_e90bf0b3-532a-4810-a9ce-79952d333173" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_A2021StockRepurchaseProgramMember_4bdfab81-1f9c-4b2b-8e22-769605f8bf3c" xlink:href="itri-20220630.xsd#itri_A2021StockRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_e90bf0b3-532a-4810-a9ce-79952d333173" xlink:to="loc_itri_A2021StockRepurchaseProgramMember_4bdfab81-1f9c-4b2b-8e22-769605f8bf3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_63010635-96a6-4b52-b938-6fac4a960b74" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9f7a553c-013c-47cf-b76e-356c6295c60a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_63010635-96a6-4b52-b938-6fac4a960b74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_63010635-96a6-4b52-b938-6fac4a960b74_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_63010635-96a6-4b52-b938-6fac4a960b74" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_63010635-96a6-4b52-b938-6fac4a960b74_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b40d4b19-7b6f-4378-9dd1-b737222e947e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_63010635-96a6-4b52-b938-6fac4a960b74" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b40d4b19-7b6f-4378-9dd1-b737222e947e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtSecuritiesMember_8a9cbe9c-69b9-435c-b4b2-db641bcad20a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b40d4b19-7b6f-4378-9dd1-b737222e947e" xlink:to="loc_us-gaap_ConvertibleDebtSecuritiesMember_8a9cbe9c-69b9-435c-b4b2-db641bcad20a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/ShareholdersEquityAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#ShareholdersEquityAccumulatedOtherComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/ShareholdersEquityAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended" id="iaffcbd9116d84985b9ae9b51f707eba2_ShareholdersEquityAccumulatedOtherComprehensiveIncomeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_8e4550ab-6668-420e-aa23-1cd374366f5d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_0ed5502c-467c-4c9a-8b38-858a48fd2264" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_8e4550ab-6668-420e-aa23-1cd374366f5d" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_0ed5502c-467c-4c9a-8b38-858a48fd2264" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_adcc49a4-ecaf-4da6-8770-02671a971d46" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_0ed5502c-467c-4c9a-8b38-858a48fd2264" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_adcc49a4-ecaf-4da6-8770-02671a971d46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_3289604e-7eed-436e-b580-89cb65719e33" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_0ed5502c-467c-4c9a-8b38-858a48fd2264" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_3289604e-7eed-436e-b580-89cb65719e33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_cfb115c8-2b59-4cbe-b1c0-8b268db4e63b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_0ed5502c-467c-4c9a-8b38-858a48fd2264" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_cfb115c8-2b59-4cbe-b1c0-8b268db4e63b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_c5b1a022-024b-4932-8644-cfe9d9390671" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_0ed5502c-467c-4c9a-8b38-858a48fd2264" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_c5b1a022-024b-4932-8644-cfe9d9390671" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_a4c30017-a0a3-4d34-bea8-f9c6357133e1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5bb0cd8d-41cd-47b5-84c3-a46c967af18b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_8e4550ab-6668-420e-aa23-1cd374366f5d" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5bb0cd8d-41cd-47b5-84c3-a46c967af18b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_ef59d07d-d0a3-47cd-b652-9b9353b1d98e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_5bb0cd8d-41cd-47b5-84c3-a46c967af18b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_ef59d07d-d0a3-47cd-b652-9b9353b1d98e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ef59d07d-d0a3-47cd-b652-9b9353b1d98e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ef59d07d-d0a3-47cd-b652-9b9353b1d98e" xlink:to="loc_us-gaap_EquityComponentDomain_ef59d07d-d0a3-47cd-b652-9b9353b1d98e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_9512a4d1-4234-43bf-8822-2ba5b8cc9643" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ef59d07d-d0a3-47cd-b652-9b9353b1d98e" xlink:to="loc_us-gaap_EquityComponentDomain_9512a4d1-4234-43bf-8822-2ba5b8cc9643" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_c623da8b-4dd3-4dcf-af27-14bd6170f238" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9512a4d1-4234-43bf-8822-2ba5b8cc9643" xlink:to="loc_us-gaap_ParentMember_c623da8b-4dd3-4dcf-af27-14bd6170f238" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_c20533ab-2e53-42d4-967c-d34388405cf5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c623da8b-4dd3-4dcf-af27-14bd6170f238" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_c20533ab-2e53-42d4-967c-d34388405cf5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_19f6183f-9a93-404d-bb02-0f85c1db26c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c623da8b-4dd3-4dcf-af27-14bd6170f238" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_19f6183f-9a93-404d-bb02-0f85c1db26c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember_35a5b035-04d1-4394-8495-e7dc83945085" xlink:href="itri-20220630.xsd#itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c623da8b-4dd3-4dcf-af27-14bd6170f238" xlink:to="loc_itri_AccumulatedOtherComprehensiveIncomeNetUnrealizedGainLossOnNonderivativeInstrumentsMember_35a5b035-04d1-4394-8495-e7dc83945085" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_c628b2de-c695-49e3-a403-6891899df3bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c623da8b-4dd3-4dcf-af27-14bd6170f238" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_c628b2de-c695-49e3-a403-6891899df3bb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_d6b92299-bed1-4c23-b5d2-32341c3e21a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_c623da8b-4dd3-4dcf-af27-14bd6170f238" xlink:to="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_d6b92299-bed1-4c23-b5d2-32341c3e21a9" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/ScheduleofFairValuesofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#ScheduleofFairValuesofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/ScheduleofFairValuesofFinancialInstrumentsDetails" xlink:type="extended" id="i7d819e31cda74a5ea1d8f131d78de488_ScheduleofFairValuesofFinancialInstrumentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_261882bb-a124-447e-9b82-d5683eee086d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_edb826c8-2470-449b-9622-fc8db5ee27af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_261882bb-a124-447e-9b82-d5683eee086d" xlink:to="loc_us-gaap_LiabilitiesAbstract_edb826c8-2470-449b-9622-fc8db5ee27af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_97c55b23-df20-4dc9-9276-002fa0f02ed3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edb826c8-2470-449b-9622-fc8db5ee27af" xlink:to="loc_us-gaap_LineOfCredit_97c55b23-df20-4dc9-9276-002fa0f02ed3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_f9f4dce9-c239-493f-827e-c8e352085e92" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edb826c8-2470-449b-9622-fc8db5ee27af" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_f9f4dce9-c239-493f-827e-c8e352085e92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleNotesPayable_5f115dc0-aeae-4089-870b-cbe264dd0b58" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_edb826c8-2470-449b-9622-fc8db5ee27af" xlink:to="loc_us-gaap_ConvertibleNotesPayable_5f115dc0-aeae-4089-870b-cbe264dd0b58" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_9579e91b-7950-45ce-b87d-2b456fe1e48f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_261882bb-a124-447e-9b82-d5683eee086d" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_9579e91b-7950-45ce-b87d-2b456fe1e48f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_8bb7d571-cb8e-44a9-888c-2ab27ff08b53" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_9579e91b-7950-45ce-b87d-2b456fe1e48f" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_8bb7d571-cb8e-44a9-888c-2ab27ff08b53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_8bb7d571-cb8e-44a9-888c-2ab27ff08b53_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_8bb7d571-cb8e-44a9-888c-2ab27ff08b53" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_8bb7d571-cb8e-44a9-888c-2ab27ff08b53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_f96ad804-0110-4f80-8fb7-c2695dcd4052" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_8bb7d571-cb8e-44a9-888c-2ab27ff08b53" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_f96ad804-0110-4f80-8fb7-c2695dcd4052" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_9de23adb-c631-4f6c-a333-d65599777b9e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_f96ad804-0110-4f80-8fb7-c2695dcd4052" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_9de23adb-c631-4f6c-a333-d65599777b9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_211e9d4d-d10e-427c-85f2-f6819bef29dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_9de23adb-c631-4f6c-a333-d65599777b9e" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_211e9d4d-d10e-427c-85f2-f6819bef29dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_50bbbad0-3d63-4365-b94d-ed3da63d43ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_9de23adb-c631-4f6c-a333-d65599777b9e" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_50bbbad0-3d63-4365-b94d-ed3da63d43ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_78693933-7d47-41ce-adde-fa30954a7788" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_9579e91b-7950-45ce-b87d-2b456fe1e48f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_78693933-7d47-41ce-adde-fa30954a7788" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_78693933-7d47-41ce-adde-fa30954a7788_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_78693933-7d47-41ce-adde-fa30954a7788" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_78693933-7d47-41ce-adde-fa30954a7788_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_a16148a0-aafc-4c4e-8b26-a09b4f6a3c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_78693933-7d47-41ce-adde-fa30954a7788" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_a16148a0-aafc-4c4e-8b26-a09b4f6a3c0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeOptionMember_dd8af38d-7db5-4e45-861e-12e410f535cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignExchangeOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_a16148a0-aafc-4c4e-8b26-a09b4f6a3c0a" xlink:to="loc_us-gaap_ForeignExchangeOptionMember_dd8af38d-7db5-4e45-861e-12e410f535cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_97a2f98c-080d-4cab-8ace-4590014b1248" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_a16148a0-aafc-4c4e-8b26-a09b4f6a3c0a" xlink:to="loc_us-gaap_InterestRateSwapMember_97a2f98c-080d-4cab-8ace-4590014b1248" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_56802d10-786a-45b1-95c4-6497e5452019" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_a16148a0-aafc-4c4e-8b26-a09b4f6a3c0a" xlink:to="loc_us-gaap_CurrencySwapMember_56802d10-786a-45b1-95c4-6497e5452019" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_f97c1a8f-aa16-41b9-a27e-b9fdc7ac932e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_9579e91b-7950-45ce-b87d-2b456fe1e48f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_f97c1a8f-aa16-41b9-a27e-b9fdc7ac932e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f97c1a8f-aa16-41b9-a27e-b9fdc7ac932e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f97c1a8f-aa16-41b9-a27e-b9fdc7ac932e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f97c1a8f-aa16-41b9-a27e-b9fdc7ac932e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_2154da06-b6c1-455e-a0a0-cbdcf7792761" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f97c1a8f-aa16-41b9-a27e-b9fdc7ac932e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_2154da06-b6c1-455e-a0a0-cbdcf7792761" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_UsdDenominatedTermLoanMember_25f0c0cf-5fcd-4b92-877e-cae92d65adf6" xlink:href="itri-20220630.xsd#itri_UsdDenominatedTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_2154da06-b6c1-455e-a0a0-cbdcf7792761" xlink:to="loc_itri_UsdDenominatedTermLoanMember_25f0c0cf-5fcd-4b92-877e-cae92d65adf6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_dbfa41fe-015a-4ebf-b91d-f125ee3364be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_2154da06-b6c1-455e-a0a0-cbdcf7792761" xlink:to="loc_us-gaap_LineOfCreditMember_dbfa41fe-015a-4ebf-b91d-f125ee3364be" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/InformationBySegmentDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#InformationBySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/InformationBySegmentDetails" xlink:type="extended" id="i3ca896444e3e4cf7a28f627d63775a3e_InformationBySegmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_d324c25f-7380-46db-8a95-8fc7b60107f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c558670e-76e8-4729-a126-0d9b6b9a7393" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d324c25f-7380-46db-8a95-8fc7b60107f4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_c558670e-76e8-4729-a126-0d9b6b9a7393" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_dd8de064-4a92-4b36-a99b-1de1fe6249f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d324c25f-7380-46db-8a95-8fc7b60107f4" xlink:to="loc_us-gaap_GrossProfit_dd8de064-4a92-4b36-a99b-1de1fe6249f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_421074cd-fcbc-4277-9979-09d74c092e4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d324c25f-7380-46db-8a95-8fc7b60107f4" xlink:to="loc_us-gaap_OperatingIncomeLoss_421074cd-fcbc-4277-9979-09d74c092e4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_4b7a5ac0-9512-4168-ace8-1c95c74d2b81" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d324c25f-7380-46db-8a95-8fc7b60107f4" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_4b7a5ac0-9512-4168-ace8-1c95c74d2b81" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5ff49a0c-2651-4fb6-9057-48e024cb8f9b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d324c25f-7380-46db-8a95-8fc7b60107f4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5ff49a0c-2651-4fb6-9057-48e024cb8f9b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_cb29af89-0db6-4e5d-87c2-55d68096ce01" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d324c25f-7380-46db-8a95-8fc7b60107f4" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_cb29af89-0db6-4e5d-87c2-55d68096ce01" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_83850786-2846-4071-b06e-4ae726b9e898" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_cb29af89-0db6-4e5d-87c2-55d68096ce01" xlink:to="loc_srt_ProductOrServiceAxis_83850786-2846-4071-b06e-4ae726b9e898" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_83850786-2846-4071-b06e-4ae726b9e898_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_83850786-2846-4071-b06e-4ae726b9e898" xlink:to="loc_srt_ProductsAndServicesDomain_83850786-2846-4071-b06e-4ae726b9e898_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_954db229-1bc9-40ff-a75f-a103e758b58a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_83850786-2846-4071-b06e-4ae726b9e898" xlink:to="loc_srt_ProductsAndServicesDomain_954db229-1bc9-40ff-a75f-a103e758b58a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_d04da9b3-96c4-456d-a485-8cfffecb1908" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_954db229-1bc9-40ff-a75f-a103e758b58a" xlink:to="loc_us-gaap_ProductMember_d04da9b3-96c4-456d-a485-8cfffecb1908" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_4264d5f3-b72d-4b7b-aa08-73760ecfcde0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_954db229-1bc9-40ff-a75f-a103e758b58a" xlink:to="loc_us-gaap_ServiceMember_4264d5f3-b72d-4b7b-aa08-73760ecfcde0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_3a665b3a-15a5-4d56-a903-bfe2518163a6" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_cb29af89-0db6-4e5d-87c2-55d68096ce01" xlink:to="loc_srt_ConsolidationItemsAxis_3a665b3a-15a5-4d56-a903-bfe2518163a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_3a665b3a-15a5-4d56-a903-bfe2518163a6_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_3a665b3a-15a5-4d56-a903-bfe2518163a6" xlink:to="loc_srt_ConsolidationItemsDomain_3a665b3a-15a5-4d56-a903-bfe2518163a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_6422aeff-0051-4f38-85da-9ded2d64be8f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_3a665b3a-15a5-4d56-a903-bfe2518163a6" xlink:to="loc_srt_ConsolidationItemsDomain_6422aeff-0051-4f38-85da-9ded2d64be8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_85a9ac46-08d3-44ba-a426-ccfea3efb7f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_6422aeff-0051-4f38-85da-9ded2d64be8f" xlink:to="loc_us-gaap_CorporateNonSegmentMember_85a9ac46-08d3-44ba-a426-ccfea3efb7f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6ce56229-cbce-4728-953d-d8a556ca3b63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_cb29af89-0db6-4e5d-87c2-55d68096ce01" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6ce56229-cbce-4728-953d-d8a556ca3b63" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6ce56229-cbce-4728-953d-d8a556ca3b63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6ce56229-cbce-4728-953d-d8a556ca3b63" xlink:to="loc_us-gaap_SegmentDomain_6ce56229-cbce-4728-953d-d8a556ca3b63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_bf2ff6bb-cd91-4d2a-acf3-e3080e290c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6ce56229-cbce-4728-953d-d8a556ca3b63" xlink:to="loc_us-gaap_SegmentDomain_bf2ff6bb-cd91-4d2a-acf3-e3080e290c0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DeviceSolutionsMember_267df23b-357b-44a6-a4ef-b538422c5adf" xlink:href="itri-20220630.xsd#itri_DeviceSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bf2ff6bb-cd91-4d2a-acf3-e3080e290c0a" xlink:to="loc_itri_DeviceSolutionsMember_267df23b-357b-44a6-a4ef-b538422c5adf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_NetworkedSolutionsSegmentMember_08d15c60-bfcb-4dde-adf5-d45bd9750854" xlink:href="itri-20220630.xsd#itri_NetworkedSolutionsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bf2ff6bb-cd91-4d2a-acf3-e3080e290c0a" xlink:to="loc_itri_NetworkedSolutionsSegmentMember_08d15c60-bfcb-4dde-adf5-d45bd9750854" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_OutcomesSegmentMember_9ebbe5ed-d71c-48be-a4c3-28f3a6f25e28" xlink:href="itri-20220630.xsd#itri_OutcomesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bf2ff6bb-cd91-4d2a-acf3-e3080e290c0a" xlink:to="loc_itri_OutcomesSegmentMember_9ebbe5ed-d71c-48be-a4c3-28f3a6f25e28" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/SegmentInformationRevenuesByRegionDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#SegmentInformationRevenuesByRegionDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/SegmentInformationRevenuesByRegionDetails" xlink:type="extended" id="icb5b3492d636437ba5d97dfb461b78b3_SegmentInformationRevenuesByRegionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_876c4a5a-fa87-4bd5-bd1c-6243431dad0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_57f2414d-912a-4a3d-a269-be6e30d67b9f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_876c4a5a-fa87-4bd5-bd1c-6243431dad0e" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_57f2414d-912a-4a3d-a269-be6e30d67b9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_32563f30-4a9d-4781-b056-95be22d46873" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_876c4a5a-fa87-4bd5-bd1c-6243431dad0e" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_32563f30-4a9d-4781-b056-95be22d46873" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_daf3b0d2-071c-4157-a1a1-5326fa0997f9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_32563f30-4a9d-4781-b056-95be22d46873" xlink:to="loc_srt_StatementGeographicalAxis_daf3b0d2-071c-4157-a1a1-5326fa0997f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_daf3b0d2-071c-4157-a1a1-5326fa0997f9_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_daf3b0d2-071c-4157-a1a1-5326fa0997f9" xlink:to="loc_srt_SegmentGeographicalDomain_daf3b0d2-071c-4157-a1a1-5326fa0997f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_1462586f-c995-41bb-adb4-eea653425db1" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_daf3b0d2-071c-4157-a1a1-5326fa0997f9" xlink:to="loc_srt_SegmentGeographicalDomain_1462586f-c995-41bb-adb4-eea653425db1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_UnitedStatesAndCanadaMember_d50e4ad6-8eb1-4f04-bf87-1031f746f537" xlink:href="itri-20220630.xsd#itri_UnitedStatesAndCanadaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1462586f-c995-41bb-adb4-eea653425db1" xlink:to="loc_itri_UnitedStatesAndCanadaMember_d50e4ad6-8eb1-4f04-bf87-1031f746f537" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_c8c0cd3f-4b2b-48b6-af7d-9f600e90e9d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1462586f-c995-41bb-adb4-eea653425db1" xlink:to="loc_us-gaap_EMEAMember_c8c0cd3f-4b2b-48b6-af7d-9f600e90e9d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_OtherCountriesMember_c8098515-a6da-49b0-b8e9-57578524a756" xlink:href="itri-20220630.xsd#itri_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_1462586f-c995-41bb-adb4-eea653425db1" xlink:to="loc_itri_OtherCountriesMember_c8098515-a6da-49b0-b8e9-57578524a756" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/DepreciationandAmortizationbySegmentDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#DepreciationandAmortizationbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/DepreciationandAmortizationbySegmentDetails" xlink:type="extended" id="ia8017996bffb447da8e40c5c1defe3ef_DepreciationandAmortizationbySegmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_aaf686c9-c289-4fe7-8e29-5b269524f1a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_0e52bf78-e4c7-456e-9843-47623fc92fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_aaf686c9-c289-4fe7-8e29-5b269524f1a4" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_0e52bf78-e4c7-456e-9843-47623fc92fe1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_fd5ecf37-ea9b-48a4-8357-314a38210413" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_aaf686c9-c289-4fe7-8e29-5b269524f1a4" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_fd5ecf37-ea9b-48a4-8357-314a38210413" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_559fef4d-5d32-41bb-8ff3-9dbba22767d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_fd5ecf37-ea9b-48a4-8357-314a38210413" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_559fef4d-5d32-41bb-8ff3-9dbba22767d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_559fef4d-5d32-41bb-8ff3-9dbba22767d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_559fef4d-5d32-41bb-8ff3-9dbba22767d1" xlink:to="loc_us-gaap_SegmentDomain_559fef4d-5d32-41bb-8ff3-9dbba22767d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_30e50018-3dcc-459e-b39d-f47f6f5cad32" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_559fef4d-5d32-41bb-8ff3-9dbba22767d1" xlink:to="loc_us-gaap_SegmentDomain_30e50018-3dcc-459e-b39d-f47f6f5cad32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DeviceSolutionsMember_46e4166a-75ef-4bbe-b3e9-c24390933f8b" xlink:href="itri-20220630.xsd#itri_DeviceSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_30e50018-3dcc-459e-b39d-f47f6f5cad32" xlink:to="loc_itri_DeviceSolutionsMember_46e4166a-75ef-4bbe-b3e9-c24390933f8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_NetworkedSolutionsSegmentMember_5e59beab-bc95-4f97-9640-80c7d7760ebe" xlink:href="itri-20220630.xsd#itri_NetworkedSolutionsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_30e50018-3dcc-459e-b39d-f47f6f5cad32" xlink:to="loc_itri_NetworkedSolutionsSegmentMember_5e59beab-bc95-4f97-9640-80c7d7760ebe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_OutcomesSegmentMember_05ee0038-287e-4ab9-8c1b-1bc9555b7480" xlink:href="itri-20220630.xsd#itri_OutcomesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_30e50018-3dcc-459e-b39d-f47f6f5cad32" xlink:to="loc_itri_OutcomesSegmentMember_05ee0038-287e-4ab9-8c1b-1bc9555b7480" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_c6e3d624-6a79-4869-89db-06f92c279985" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_fd5ecf37-ea9b-48a4-8357-314a38210413" xlink:to="loc_srt_ConsolidationItemsAxis_c6e3d624-6a79-4869-89db-06f92c279985" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_c6e3d624-6a79-4869-89db-06f92c279985_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_c6e3d624-6a79-4869-89db-06f92c279985" xlink:to="loc_srt_ConsolidationItemsDomain_c6e3d624-6a79-4869-89db-06f92c279985_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_9c935a9f-b70a-4be0-8040-496abd23e185" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_c6e3d624-6a79-4869-89db-06f92c279985" xlink:to="loc_srt_ConsolidationItemsDomain_9c935a9f-b70a-4be0-8040-496abd23e185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_c4bbef6c-6f4d-4b96-908e-d5d8ccf77c70" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_9c935a9f-b70a-4be0-8040-496abd23e185" xlink:to="loc_us-gaap_CorporateNonSegmentMember_c4bbef6c-6f4d-4b96-908e-d5d8ccf77c70" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/RevenueRecognitionRemaingPerformanceObligationDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#RevenueRecognitionRemaingPerformanceObligationDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/RevenueRecognitionRemaingPerformanceObligationDetails" xlink:type="extended" id="i699dc2ad86e94b13bc914c875af6d484_RevenueRecognitionRemaingPerformanceObligationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_5eb44bb0-0a83-467a-bd10-962e4a9798d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_e502a4be-10a6-414c-ad95-d7dddbcb0aaa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_5eb44bb0-0a83-467a-bd10-962e4a9798d3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_e502a4be-10a6-414c-ad95-d7dddbcb0aaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_74a16b6c-7593-4594-95be-4e0ea564a943" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_5eb44bb0-0a83-467a-bd10-962e4a9798d3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_74a16b6c-7593-4594-95be-4e0ea564a943" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7dcac023-4edc-46f2-85a3-3e3f946ce849" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_5eb44bb0-0a83-467a-bd10-962e4a9798d3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7dcac023-4edc-46f2-85a3-3e3f946ce849" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_972b3978-2327-4532-8c9d-144a22b103ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7dcac023-4edc-46f2-85a3-3e3f946ce849" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_972b3978-2327-4532-8c9d-144a22b103ce" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/RevenueRecognitionRemaingPerformanceObligationDetails_1" xlink:type="simple" xlink:href="itri-20220630.xsd#RevenueRecognitionRemaingPerformanceObligationDetails_1"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/RevenueRecognitionRemaingPerformanceObligationDetails_1" xlink:type="extended" id="i2cd71ff88a9347298a9922a85eb08894_RevenueRecognitionRemaingPerformanceObligationDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_5eb44bb0-0a83-467a-bd10-962e4a9798d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_e502a4be-10a6-414c-ad95-d7dddbcb0aaa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_5eb44bb0-0a83-467a-bd10-962e4a9798d3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_e502a4be-10a6-414c-ad95-d7dddbcb0aaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_74a16b6c-7593-4594-95be-4e0ea564a943" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_5eb44bb0-0a83-467a-bd10-962e4a9798d3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_74a16b6c-7593-4594-95be-4e0ea564a943" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7dcac023-4edc-46f2-85a3-3e3f946ce849" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_5eb44bb0-0a83-467a-bd10-962e4a9798d3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7dcac023-4edc-46f2-85a3-3e3f946ce849" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.itron.com/role/SaleofBusinessNarrativeDetails" xlink:type="simple" xlink:href="itri-20220630.xsd#SaleofBusinessNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.itron.com/role/SaleofBusinessNarrativeDetails" xlink:type="extended" id="ic2f70cd6a13645c08caacc7288658df1_SaleofBusinessNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83d1e65b-59f5-46f1-af2f-3f1978b3801e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_55474e7c-8367-4b17-8c20-00b7b01c3574" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83d1e65b-59f5-46f1-af2f-3f1978b3801e" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_55474e7c-8367-4b17-8c20-00b7b01c3574" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLosses_d3760e10-77d9-4dcb-8059-caaa053a1028" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83d1e65b-59f5-46f1-af2f-3f1978b3801e" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTranslationGainsLosses_d3760e10-77d9-4dcb-8059-caaa053a1028" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DisposalGroupIncludingDiscontinuedInterestReceived_b7f2268d-384f-4ce7-93fe-a4b23741d4bd" xlink:href="itri-20220630.xsd#itri_DisposalGroupIncludingDiscontinuedInterestReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83d1e65b-59f5-46f1-af2f-3f1978b3801e" xlink:to="loc_itri_DisposalGroupIncludingDiscontinuedInterestReceived_b7f2268d-384f-4ce7-93fe-a4b23741d4bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherAssets_a3968257-8cd2-46f1-9f86-919ae0a91fae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnSaleOfOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83d1e65b-59f5-46f1-af2f-3f1978b3801e" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherAssets_a3968257-8cd2-46f1-9f86-919ae0a91fae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DisposalGroupIncludingDiscontinuedOperationWorkingCapital_ae617d62-08d8-4572-9e2c-585cce389c28" xlink:href="itri-20220630.xsd#itri_DisposalGroupIncludingDiscontinuedOperationWorkingCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83d1e65b-59f5-46f1-af2f-3f1978b3801e" xlink:to="loc_itri_DisposalGroupIncludingDiscontinuedOperationWorkingCapital_ae617d62-08d8-4572-9e2c-585cce389c28" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_aab2b333-882e-40c3-92c3-534b8cb95b65" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83d1e65b-59f5-46f1-af2f-3f1978b3801e" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_aab2b333-882e-40c3-92c3-534b8cb95b65" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_46799209-921c-4347-a904-4803e507840e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83d1e65b-59f5-46f1-af2f-3f1978b3801e" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_46799209-921c-4347-a904-4803e507840e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_3d9b5bfa-45bc-43f0-9df5-976543438a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83d1e65b-59f5-46f1-af2f-3f1978b3801e" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_3d9b5bfa-45bc-43f0-9df5-976543438a2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_ea4cdf08-0abe-47b7-a5b0-029c0a0782d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_3d9b5bfa-45bc-43f0-9df5-976543438a2a" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_ea4cdf08-0abe-47b7-a5b0-029c0a0782d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_ea4cdf08-0abe-47b7-a5b0-029c0a0782d3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_ea4cdf08-0abe-47b7-a5b0-029c0a0782d3" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_ea4cdf08-0abe-47b7-a5b0-029c0a0782d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_57d2791a-436c-49f6-9a25-7b5096df307b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_ea4cdf08-0abe-47b7-a5b0-029c0a0782d3" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_57d2791a-436c-49f6-9a25-7b5096df307b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_03cba19c-8a9e-41fe-a639-6d9f9ad686cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_57d2791a-436c-49f6-9a25-7b5096df307b" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_03cba19c-8a9e-41fe-a639-6d9f9ad686cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_cbe67f3b-0268-4849-93f3-648989c35b5e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_3d9b5bfa-45bc-43f0-9df5-976543438a2a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_cbe67f3b-0268-4849-93f3-648989c35b5e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cbe67f3b-0268-4849-93f3-648989c35b5e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_cbe67f3b-0268-4849-93f3-648989c35b5e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cbe67f3b-0268-4849-93f3-648989c35b5e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ebfa1732-c206-4f35-b6ba-562cb0116035" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_cbe67f3b-0268-4849-93f3-648989c35b5e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ebfa1732-c206-4f35-b6ba-562cb0116035" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_itri_DresserMember_c6860c70-c7c4-4831-9519-604f5f9bd130" xlink:href="itri-20220630.xsd#itri_DresserMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ebfa1732-c206-4f35-b6ba-562cb0116035" xlink:to="loc_itri_DresserMember_c6860c70-c7c4-4831-9519-604f5f9bd130" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
