<?xml version="1.0" encoding="utf-8"?>
<!--XBRL document created with Toppan Merrill Bridge  11.2.0.5 -->
<!--Based on XBRL 2.1-->
<!--Created on: 3/27/2026 8:59:56 AM-->
<!--Modified on: 3/27/2026 8:59:56 AM-->
<link:linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" 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" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance">
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DocumentDocumentAndEntityInformation" roleURI="http://www.himax.com.tw/role/DocumentDocumentAndEntityInformation" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#StatementConsolidatedStatementsOfChangesInEquity" roleURI="http://www.himax.com.tw/role/StatementConsolidatedStatementsOfChangesInEquity" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureHimaxTechnologiesIncParentCompanyOnly" roleURI="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnly" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureShareBasedCompensationTables" roleURI="http://www.himax.com.tw/role/DisclosureShareBasedCompensationTables" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureHimaxTechnologiesIncParentCompanyOnlyTables" roleURI="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyTables" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureApplicationOfNewAndRevisedIfrsAsIssuedByIasbDetails" roleURI="http://www.himax.com.tw/role/DisclosureApplicationOfNewAndRevisedIfrsAsIssuedByIasbDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureMaterialAccountingPoliciesDetails" roleURI="http://www.himax.com.tw/role/DisclosureMaterialAccountingPoliciesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureMaterialAccountingPoliciesAdditionalInformationDetails" roleURI="http://www.himax.com.tw/role/DisclosureMaterialAccountingPoliciesAdditionalInformationDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureConsolidationAdditionalInformationDetails" roleURI="http://www.himax.com.tw/role/DisclosureConsolidationAdditionalInformationDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureConsolidationEstimatedFairValueOfAssetsAcquiredAndLiabilitiesDetails" roleURI="http://www.himax.com.tw/role/DisclosureConsolidationEstimatedFairValueOfAssetsAcquiredAndLiabilitiesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialAssetsAtFairValueThroughProfitOrLossDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialAssetsAtFairValueThroughProfitOrLossDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureAccountsReceivableNetIncludingRelatedPartiesAnalysisOfExpectedCreditLossesDetails" roleURI="http://www.himax.com.tw/role/DisclosureAccountsReceivableNetIncludingRelatedPartiesAnalysisOfExpectedCreditLossesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureEquityMethodInvestmentsDetails" roleURI="http://www.himax.com.tw/role/DisclosureEquityMethodInvestmentsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureEquityMethodInvestmentsAdditionalInformationDetails" roleURI="http://www.himax.com.tw/role/DisclosureEquityMethodInvestmentsAdditionalInformationDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureOtherIntangibleAssetsDetails" roleURI="http://www.himax.com.tw/role/DisclosureOtherIntangibleAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureOtherIntangibleAssetsEstimatedUsefulLivesDetails" roleURI="http://www.himax.com.tw/role/DisclosureOtherIntangibleAssetsEstimatedUsefulLivesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosurePropertyPlantAndEquipmentDetails" roleURI="http://www.himax.com.tw/role/DisclosurePropertyPlantAndEquipmentDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosurePropertyPlantAndEquipmentEstimatedUsefulLivesDetails" roleURI="http://www.himax.com.tw/role/DisclosurePropertyPlantAndEquipmentEstimatedUsefulLivesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosurePropertyPlantAndEquipmentRightOfUseAssetsDetails" roleURI="http://www.himax.com.tw/role/DisclosurePropertyPlantAndEquipmentRightOfUseAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureShortTermBorrowingsDetails" roleURI="http://www.himax.com.tw/role/DisclosureShortTermBorrowingsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureShortTermBorrowingsReconciliationOfLeaseLiabilitiesToCashFlowsArisingFromFinancingActivitiesDetails" roleURI="http://www.himax.com.tw/role/DisclosureShortTermBorrowingsReconciliationOfLeaseLiabilitiesToCashFlowsArisingFromFinancingActivitiesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureLongTermBorrowingsDetails" roleURI="http://www.himax.com.tw/role/DisclosureLongTermBorrowingsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureLongTermBorrowingsReconciliationOfLeaseLiabilitiesToCashFlowsArisingFromFinancingActivitiesDetails" roleURI="http://www.himax.com.tw/role/DisclosureLongTermBorrowingsReconciliationOfLeaseLiabilitiesToCashFlowsArisingFromFinancingActivitiesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureLongTermBorrowingsLongTermBorrowingsDetails" roleURI="http://www.himax.com.tw/role/DisclosureLongTermBorrowingsLongTermBorrowingsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureEmployeeBenefitsDetails" roleURI="http://www.himax.com.tw/role/DisclosureEmployeeBenefitsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureEmployeeBenefitsExpensesRecognizedInProfitOrLossDetails" roleURI="http://www.himax.com.tw/role/DisclosureEmployeeBenefitsExpensesRecognizedInProfitOrLossDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureShareBasedCompensationDetails" roleURI="http://www.himax.com.tw/role/DisclosureShareBasedCompensationDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureShareBasedCompensationRsusActivityUnderLongTermIncentivePlanDetails" roleURI="http://www.himax.com.tw/role/DisclosureShareBasedCompensationRsusActivityUnderLongTermIncentivePlanDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureShareBasedCompensationAllocationOfCompensationExpensesAndRelatedTaxEffectsFromRsusGrantedToEmployeesDetails" roleURI="http://www.himax.com.tw/role/DisclosureShareBasedCompensationAllocationOfCompensationExpensesAndRelatedTaxEffectsFromRsusGrantedToEmployeesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureShareBasedCompensationValuationAssumptionsDetails" roleURI="http://www.himax.com.tw/role/DisclosureShareBasedCompensationValuationAssumptionsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureShareBasedCompensationStockOptionActivityDetails" roleURI="http://www.himax.com.tw/role/DisclosureShareBasedCompensationStockOptionActivityDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureShareBasedCompensationAdditionalInformationDetails" roleURI="http://www.himax.com.tw/role/DisclosureShareBasedCompensationAdditionalInformationDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureEquityAdditionalPaidInCapitalDetails" roleURI="http://www.himax.com.tw/role/DisclosureEquityAdditionalPaidInCapitalDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureEquityAccumulatedOtherComprehensiveIncomeDetails" roleURI="http://www.himax.com.tw/role/DisclosureEquityAccumulatedOtherComprehensiveIncomeDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureEquityNoncontrollingInterestDetails" roleURI="http://www.himax.com.tw/role/DisclosureEquityNoncontrollingInterestDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureEquityAdditionalInformationDetails" roleURI="http://www.himax.com.tw/role/DisclosureEquityAdditionalInformationDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureIncomeTaxesChangesInDeferredTaxAssetsAndLiabilitiesDetails" roleURI="http://www.himax.com.tw/role/DisclosureIncomeTaxesChangesInDeferredTaxAssetsAndLiabilitiesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureIncomeTaxesUnrecognizedDeferredTaxAssetsDetails" roleURI="http://www.himax.com.tw/role/DisclosureIncomeTaxesUnrecognizedDeferredTaxAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureIncomeTaxesExpirationPeriodForUnrecognizedDeferredTaxAssetsDetails" roleURI="http://www.himax.com.tw/role/DisclosureIncomeTaxesExpirationPeriodForUnrecognizedDeferredTaxAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureIncomeTaxesAdditionalInformationDetails" roleURI="http://www.himax.com.tw/role/DisclosureIncomeTaxesAdditionalInformationDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialInstrumentsFinancialAssetsDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsFinancialAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialInstrumentsFinancialLiabilitiesDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsFinancialLiabilitiesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialInstrumentsLiquidityRiskDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsLiquidityRiskDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialInstrumentsCurrencyRiskDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsCurrencyRiskDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialInstrumentsFinancialInstrumentsMeasuredAtFairValueDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsFinancialInstrumentsMeasuredAtFairValueDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialInstrumentsMovementInFinancialAssetsIncludedInLevel3OfFairValueHierarchyDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsMovementInFinancialAssetsIncludedInLevel3OfFairValueHierarchyDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialInstrumentsAdditionalInformationDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsAdditionalInformationDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialRiskManagementPercentageOfRevenuesDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialRiskManagementPercentageOfRevenuesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureFinancialRiskManagementPercentageOfAccountsReceivableDetails" roleURI="http://www.himax.com.tw/role/DisclosureFinancialRiskManagementPercentageOfAccountsReceivableDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureRelatedPartyTransactionsDetails" roleURI="http://www.himax.com.tw/role/DisclosureRelatedPartyTransactionsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosurePledgedAssetsDetails" roleURI="http://www.himax.com.tw/role/DisclosurePledgedAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureSegmentProductAndGeographicInformationScheduleOfSegmentReportingDetails" roleURI="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationScheduleOfSegmentReportingDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureSegmentProductAndGeographicInformationSegmentRevenuesFromCustomersInDifferentGeographicRegionDetails" roleURI="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationSegmentRevenuesFromCustomersInDifferentGeographicRegionDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureSegmentProductAndGeographicInformationSegmentRevenuesFromMajorProductLinesDetails" roleURI="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationSegmentRevenuesFromMajorProductLinesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureSegmentProductAndGeographicInformationCarryingValuesOfCompanySTangibleLongLivedAssetsDetails" roleURI="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationCarryingValuesOfCompanySTangibleLongLivedAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureSegmentProductAndGeographicInformationRevenuesFromSignificantCustomersDetails" roleURI="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationRevenuesFromSignificantCustomersDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureSegmentProductAndGeographicInformationAccountsReceivableFromSignificantCustomersDetails" roleURI="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationAccountsReceivableFromSignificantCustomersDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureNatureOfExpensesDepreciationOfPropertyPlantAndEquipmentDetails" roleURI="http://www.himax.com.tw/role/DisclosureNatureOfExpensesDepreciationOfPropertyPlantAndEquipmentDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureNatureOfExpensesAmortizationOfIntangibleAssetsDetails" roleURI="http://www.himax.com.tw/role/DisclosureNatureOfExpensesAmortizationOfIntangibleAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureNatureOfExpensesEmployeeBenefitsExpenseSummarizedByFunctionDetails" roleURI="http://www.himax.com.tw/role/DisclosureNatureOfExpensesEmployeeBenefitsExpenseSummarizedByFunctionDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfFinancialPositionDetails" roleURI="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfFinancialPositionDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfProfitOrLossDetails" roleURI="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfProfitOrLossDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfOtherComprehensiveIncomeDetails" roleURI="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfOtherComprehensiveIncomeDetails" />
  <link:roleRef xlink:type="simple" xlink:href="himx-20251231.xsd#DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfCashFlowsDetails" roleURI="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfCashFlowsDetails" />
  <link:arcroleRef arcroleURI="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/arcrole/esma-arcrole-2018-11-21.xsd#wider-narrower" />
  <link:roleRef roleURI="http://www.himax.com.tw/role/DisclosureStandardAndCustomAxisDomainDefaults" xlink:href="himx-20251231.xsd#DisclosureStandardAndCustomAxisDomainDefaults" xlink:type="simple" />
  <link:roleRef xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm" roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" />
  <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/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: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:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended" xlink:title="Extensible Enumeration Domain Members" />
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureStandardAndCustomAxisDomainDefaults" xlink:type="extended" xlink:title="99900 - Disclosure - Standard And Custom Axis Domain Defaults">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis_1" xlink:title="ifrs-full_ComponentsOfEquityAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_1" xlink:title="ifrs-full_EquityMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ComponentsOfEquityAxis_1" xlink:to="ifrs-full_ComponentsOfEquityDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ComponentsOfEquityAxis_1 To ifrs-full_EquityMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialEffectOfTransitionFromPreviousGAAPToIFRSsAxis" xlink:label="ifrs-full_FinancialEffectOfTransitionFromPreviousGAAPToIFRSsAxis_1" xlink:title="ifrs-full_FinancialEffectOfTransitionFromPreviousGAAPToIFRSsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IFRSsMember" xlink:label="ifrs-full_IFRSsMember_1" xlink:title="ifrs-full_IFRSsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_FinancialEffectOfTransitionFromPreviousGAAPToIFRSsAxis_1" xlink:to="ifrs-full_IFRSsMember_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_FinancialEffectOfTransitionFromPreviousGAAPToIFRSsAxis_1 To ifrs-full_IFRSsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="ifrs-full_BusinessCombinationsAxis_1" xlink:title="ifrs-full_BusinessCombinationsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="ifrs-full_BusinessCombinationsDomain_1" xlink:title="ifrs-full_EntitysTotalForBusinessCombinationsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_BusinessCombinationsAxis_1" xlink:to="ifrs-full_BusinessCombinationsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_BusinessCombinationsAxis_1 To ifrs-full_EntitysTotalForBusinessCombinationsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LegalEntitiesAxis" xlink:label="himx_LegalEntitiesAxis" xlink:title="himx_LegalEntitiesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LegalEntitiesMember" xlink:label="himx_LegalEntitiesMember_1" xlink:title="himx_LegalEntitiesMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_LegalEntitiesAxis" xlink:to="himx_LegalEntitiesMember_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_LegalEntitiesAxis_1 To himx_LegalEntitiesMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsAxis" xlink:label="ifrs-full_NewIFRSsAxis_1" xlink:title="ifrs-full_NewIFRSsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsDomain" xlink:label="ifrs-full_NewIFRSsDomain_1" xlink:title="ifrs-full_NewIFRSsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_NewIFRSsAxis_1" xlink:to="ifrs-full_NewIFRSsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_NewIFRSsAxis_1 To ifrs-full_NewIFRSsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:label="ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_1" xlink:title="ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain" xlink:label="ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_1" xlink:title="ifrs-full_NonadjustingEventsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_1" xlink:to="ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_1 To ifrs-full_NonadjustingEventsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="ifrs-full_GeographicalAreasAxis_1" xlink:title="ifrs-full_GeographicalAreasAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="ifrs-full_GeographicalAreasDomain_1" xlink:title="ifrs-full_GeographicalAreasMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_GeographicalAreasAxis_1" xlink:to="ifrs-full_GeographicalAreasDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_GeographicalAreasAxis_1 To ifrs-full_GeographicalAreasMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:title="ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" xlink:title="ifrs-full_EntitysTotalForSubsidiariesMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1" xlink:to="ifrs-full_SignificantInvestmentsInSubsidiariesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_SignificantInvestmentsInSubsidiariesAxis_1 To ifrs-full_EntitysTotalForSubsidiariesMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_1" xlink:title="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_1" xlink:title="ifrs-full_PropertyPlantAndEquipmentMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_1" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_1 To ifrs-full_PropertyPlantAndEquipmentMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LegalEntityAxisAxis" xlink:label="himx_LegalEntityAxisAxis_1" xlink:title="himx_LegalEntityAxisAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LegalEntityDomain" xlink:label="himx_LegalEntityDomain_1" xlink:title="himx_LegalEntityDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_LegalEntityAxisAxis_1" xlink:to="himx_LegalEntityDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_LegalEntityAxisAxis_1 To himx_LegalEntityDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_1" xlink:title="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_1" xlink:title="ifrs-full_IntangibleAssetsOtherThanGoodwillMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_1" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_1 To ifrs-full_IntangibleAssetsOtherThanGoodwillMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis" xlink:label="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_1" xlink:title="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain" xlink:label="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_1" xlink:title="ifrs-full_EntitysTotalForCashgeneratingUnitsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_1" xlink:to="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_1 To ifrs-full_EntitysTotalForCashgeneratingUnitsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis_1" xlink:title="ifrs-full_RangeAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_1" xlink:title="ifrs-full_RangesMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_RangeAxis_1" xlink:to="ifrs-full_RangeDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_RangeAxis_1 To ifrs-full_RangesMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsAxis" xlink:label="ifrs-full_ClassesOfAssetsAxis_1" xlink:title="ifrs-full_ClassesOfAssetsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsDomain" xlink:label="ifrs-full_ClassesOfAssetsDomain_1" xlink:title="ifrs-full_ClassesOfAssetsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ClassesOfAssetsAxis_1" xlink:to="ifrs-full_ClassesOfAssetsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ClassesOfAssetsAxis_1 To ifrs-full_ClassesOfAssetsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:label="ifrs-full_CategoriesOfFinancialAssetsAxis_1" xlink:title="ifrs-full_CategoriesOfFinancialAssetsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain_1" xlink:title="ifrs-full_FinancialAssetsCategoryMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_CategoriesOfFinancialAssetsAxis_1" xlink:to="ifrs-full_CategoriesOfFinancialAssetsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_CategoriesOfFinancialAssetsAxis_1 To ifrs-full_FinancialAssetsCategoryMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis" xlink:label="ifrs-full_ClassesOfFinancialAssetsAxis_1" xlink:title="ifrs-full_ClassesOfFinancialAssetsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="ifrs-full_ClassesOfFinancialAssetsDomain_1" xlink:title="ifrs-full_FinancialAssetsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ClassesOfFinancialAssetsAxis_1" xlink:to="ifrs-full_ClassesOfFinancialAssetsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ClassesOfFinancialAssetsAxis_1 To ifrs-full_FinancialAssetsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesAxis_1" xlink:title="ifrs-full_CategoriesOfFinancialLiabilitiesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesDomain_1" xlink:title="ifrs-full_FinancialLiabilitiesCategoryMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesAxis_1" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_CategoriesOfFinancialLiabilitiesAxis_1 To ifrs-full_FinancialLiabilitiesCategoryMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PastDueStatusAxis" xlink:label="ifrs-full_PastDueStatusAxis_1" xlink:title="ifrs-full_PastDueStatusAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PastDueStatusDomain" xlink:label="ifrs-full_PastDueStatusDomain_1" xlink:title="ifrs-full_PastDueStatusMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_PastDueStatusAxis_1" xlink:to="ifrs-full_PastDueStatusDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_PastDueStatusAxis_1 To ifrs-full_PastDueStatusMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis" xlink:label="ifrs-full_SignificantInvestmentsInAssociatesAxis_1" xlink:title="ifrs-full_SignificantInvestmentsInAssociatesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:label="ifrs-full_SignificantInvestmentsInAssociatesDomain_1" xlink:title="ifrs-full_EntitysTotalForAssociatesMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesAxis_1" xlink:to="ifrs-full_SignificantInvestmentsInAssociatesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_SignificantInvestmentsInAssociatesAxis_1 To ifrs-full_EntitysTotalForAssociatesMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:title="ifrs-full_CategoriesOfRelatedPartiesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_1" xlink:title="ifrs-full_EntitysTotalForRelatedPartiesMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis_1" xlink:to="ifrs-full_CategoriesOfRelatedPartiesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_CategoriesOfRelatedPartiesAxis_1 To ifrs-full_EntitysTotalForRelatedPartiesMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:label="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_1" xlink:title="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember" xlink:label="ifrs-full_CarryingAmountMember_1" xlink:title="ifrs-full_CarryingAmountMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_1" xlink:to="ifrs-full_CarryingAmountMember_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_1 To ifrs-full_CarryingAmountMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InitiallyAppliedIFRSsAxis" xlink:label="ifrs-full_InitiallyAppliedIFRSsAxis_1" xlink:title="ifrs-full_InitiallyAppliedIFRSsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InitiallyAppliedIFRSsDomain" xlink:label="ifrs-full_InitiallyAppliedIFRSsDomain_1" xlink:title="ifrs-full_InitiallyAppliedIFRSsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_InitiallyAppliedIFRSsAxis_1" xlink:to="ifrs-full_InitiallyAppliedIFRSsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_InitiallyAppliedIFRSsAxis_1 To ifrs-full_InitiallyAppliedIFRSsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis" xlink:label="ifrs-full_ClassesOfShareCapitalAxis_1" xlink:title="ifrs-full_ClassesOfShareCapitalAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain" xlink:label="ifrs-full_ClassesOfShareCapitalDomain_1" xlink:title="ifrs-full_ClassesOfShareCapitalMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ClassesOfShareCapitalAxis_1" xlink:to="ifrs-full_ClassesOfShareCapitalDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ClassesOfShareCapitalAxis_1 To ifrs-full_ClassesOfShareCapitalMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis_1" xlink:title="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_1" xlink:title="ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis_1" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis_1 To ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="ifrs-full_BorrowingsByNameAxis_1" xlink:title="ifrs-full_BorrowingsByNameAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain" xlink:label="ifrs-full_BorrowingsByNameDomain_1" xlink:title="ifrs-full_BorrowingsByNameMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_BorrowingsByNameAxis_1" xlink:to="ifrs-full_BorrowingsByNameDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_BorrowingsByNameAxis_1 To ifrs-full_BorrowingsByNameMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis" xlink:label="ifrs-full_MaturityAxis_1" xlink:title="ifrs-full_MaturityAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain" xlink:label="ifrs-full_MaturityDomain_1" xlink:title="ifrs-full_AggregatedTimeBandsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_MaturityAxis_1" xlink:to="ifrs-full_MaturityDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_MaturityAxis_1 To ifrs-full_AggregatedTimeBandsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitPlansAxis" xlink:label="ifrs-full_DefinedBenefitPlansAxis_1" xlink:title="ifrs-full_DefinedBenefitPlansAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitPlansDomain" xlink:label="ifrs-full_DefinedBenefitPlansDomain_1" xlink:title="ifrs-full_DefinedBenefitPlansMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_DefinedBenefitPlansAxis_1" xlink:to="ifrs-full_DefinedBenefitPlansDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_DefinedBenefitPlansAxis_1 To ifrs-full_DefinedBenefitPlansMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ActuarialAssumptionsAxis" xlink:label="ifrs-full_ActuarialAssumptionsAxis_1" xlink:title="ifrs-full_ActuarialAssumptionsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ActuarialAssumptionsDomain" xlink:label="ifrs-full_ActuarialAssumptionsDomain_1" xlink:title="ifrs-full_ActuarialAssumptionsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ActuarialAssumptionsAxis_1" xlink:to="ifrs-full_ActuarialAssumptionsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ActuarialAssumptionsAxis_1 To ifrs-full_ActuarialAssumptionsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_SensitivityAnalysisToDefinedBenefitPlanAxis" xlink:label="himx_SensitivityAnalysisToDefinedBenefitPlanAxis_1" xlink:title="himx_SensitivityAnalysisToDefinedBenefitPlanAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_SensitivityAnalysisToDefinedBenefitPlanAxisMember" xlink:label="himx_SensitivityAnalysisToDefinedBenefitPlanAxisMember_1" xlink:title="himx_SensitivityAnalysisToDefinedBenefitPlanAxisMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_SensitivityAnalysisToDefinedBenefitPlanAxis_1" xlink:to="himx_SensitivityAnalysisToDefinedBenefitPlanAxisMember_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_SensitivityAnalysisToDefinedBenefitPlanAxis_1 To himx_SensitivityAnalysisToDefinedBenefitPlanAxisMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_1" xlink:title="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_1" xlink:title="ifrs-full_SharebasedPaymentArrangementsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_1" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_1 To ifrs-full_SharebasedPaymentArrangementsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanAxis" xlink:label="himx_StockOptionPlanAxis" xlink:title="himx_StockOprtionPlanNameAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanDomain" xlink:label="himx_StockOptionPlanDomain" xlink:title="himx_StockOprtionPlanNameMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_StockOptionPlanAxis" xlink:to="himx_StockOptionPlanDomain" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_StockOprtionPlanNameAxis_1 To himx_StockOprtionPlanNameMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IssuerEquityTypeAxis" xlink:label="himx_IssuerEquityTypeAxis_1" xlink:title="himx_IssuerEquityTypeAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IssuerEquityTypeMember" xlink:label="himx_IssuerEquityTypeMember_1" xlink:title="himx_IssuerEquityTypeMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_IssuerEquityTypeAxis_1" xlink:to="himx_IssuerEquityTypeMember_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_IssuerEquityTypeAxis_1 To himx_IssuerEquityTypeMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionVestingAxis" xlink:label="himx_StockOptionVestingAxis_1" xlink:title="himx_StockOptionVestingAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionVestingMember" xlink:label="himx_StockOptionVestingMember_1" xlink:title="himx_StockOptionVestingMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_StockOptionVestingAxis_1" xlink:to="himx_StockOptionVestingMember_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_StockOptionVestingAxis_1 To himx_StockOptionVestingMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfOrdinarySharesAxis" xlink:label="ifrs-full_ClassesOfOrdinarySharesAxis_1" xlink:title="ifrs-full_ClassesOfOrdinarySharesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfOrdinarySharesDomain" xlink:label="ifrs-full_ClassesOfOrdinarySharesDomain_1" xlink:title="ifrs-full_OrdinarySharesMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ClassesOfOrdinarySharesAxis_1" xlink:to="ifrs-full_ClassesOfOrdinarySharesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ClassesOfOrdinarySharesAxis_1 To ifrs-full_OrdinarySharesMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CurrencyTranslationAxis" xlink:label="himx_CurrencyTranslationAxis_1" xlink:title="himx_CurrencyTranslationAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CurrencyTranslationDomain" xlink:label="himx_CurrencyTranslationDomain_1" xlink:title="himx_CurrencyTranslationDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_CurrencyTranslationAxis_1" xlink:to="himx_CurrencyTranslationDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_CurrencyTranslationAxis_1 To himx_CurrencyTranslationDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FairValueMeasurementAndAdjustmentAxis" xlink:label="himx_FairValueMeasurementAndAdjustmentAxis_1" xlink:title="himx_FairValueMeasurementAndAdjustmentAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FairValueMeasurementAndAdjustmentDomain" xlink:label="himx_FairValueMeasurementAndAdjustmentDomain_1" xlink:title="himx_FairValueMeasurementAndAdjustmentDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_FairValueMeasurementAndAdjustmentAxis_1" xlink:to="himx_FairValueMeasurementAndAdjustmentDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_FairValueMeasurementAndAdjustmentAxis_1 To himx_FairValueMeasurementAndAdjustmentDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_1" xlink:title="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_1" xlink:title="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_1" xlink:to="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_1 To ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="ifrs-full_TypesOfRisksAxis_1" xlink:title="ifrs-full_TypesOfRisksAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="ifrs-full_TypesOfRisksDomain_1" xlink:title="ifrs-full_TypesOfRisksMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_TypesOfRisksAxis_1" xlink:to="ifrs-full_TypesOfRisksDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_TypesOfRisksAxis_1 To ifrs-full_TypesOfRisksMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:label="ifrs-full_LevelsOfFairValueHierarchyAxis_1" xlink:title="ifrs-full_LevelsOfFairValueHierarchyAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:label="ifrs-full_LevelsOfFairValueHierarchyDomain_1" xlink:title="ifrs-full_AllLevelsOfFairValueHierarchyMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_LevelsOfFairValueHierarchyAxis_1" xlink:to="ifrs-full_LevelsOfFairValueHierarchyDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_LevelsOfFairValueHierarchyAxis_1 To ifrs-full_AllLevelsOfFairValueHierarchyMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesAxis" xlink:label="ifrs-full_TypesOfInterestRatesAxis_1" xlink:title="ifrs-full_TypesOfInterestRatesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain" xlink:label="ifrs-full_TypesOfInterestRatesDomain_1" xlink:title="ifrs-full_InterestRateTypesMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_TypesOfInterestRatesAxis_1" xlink:to="ifrs-full_TypesOfInterestRatesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_TypesOfInterestRatesAxis_1 To ifrs-full_InterestRateTypesMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnobservableInputsAxis" xlink:label="ifrs-full_UnobservableInputsAxis_1" xlink:title="ifrs-full_UnobservableInputsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnobservableInputsDomain" xlink:label="ifrs-full_UnobservableInputsDomain_1" xlink:title="ifrs-full_UnobservableInputsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_UnobservableInputsAxis_1" xlink:to="ifrs-full_UnobservableInputsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_UnobservableInputsAxis_1 To ifrs-full_UnobservableInputsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersAxis" xlink:label="ifrs-full_MajorCustomersAxis_1" xlink:title="ifrs-full_MajorCustomersAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersDomain" xlink:label="ifrs-full_MajorCustomersDomain_1" xlink:title="ifrs-full_MajorCustomersMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_MajorCustomersAxis_1" xlink:to="ifrs-full_MajorCustomersDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_MajorCustomersAxis_1 To ifrs-full_MajorCustomersMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CategoriesOfItemsPurchaseAxis" xlink:label="himx_CategoriesOfItemsPurchaseAxis_1" xlink:title="himx_CategoriesOfItemsPurchaseAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CategoriesOfItemsPurchaseMember" xlink:label="himx_CategoriesOfItemsPurchaseMember_1" xlink:title="himx_CategoriesOfItemsPurchaseMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_CategoriesOfItemsPurchaseAxis_1" xlink:to="himx_CategoriesOfItemsPurchaseMember_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_CategoriesOfItemsPurchaseAxis_1 To himx_CategoriesOfItemsPurchaseMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="ifrs-full_ProductsAndServicesAxis_1" xlink:title="ifrs-full_ProductsAndServicesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain" xlink:label="ifrs-full_ProductsAndServicesDomain_1" xlink:title="ifrs-full_ProductsAndServicesMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ProductsAndServicesAxis_1" xlink:to="ifrs-full_ProductsAndServicesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ProductsAndServicesAxis_1 To ifrs-full_ProductsAndServicesMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ApplicationsAxis" xlink:label="himx_ApplicationsAxis_1" xlink:title="himx_ApplicationsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ApplicationsDomain" xlink:label="himx_ApplicationsDomain_1" xlink:title="himx_ApplicationsDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_ApplicationsAxis_1" xlink:to="himx_ApplicationsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_ApplicationsAxis_1 To himx_ApplicationsDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis" xlink:label="ifrs-full_SegmentsAxis_1" xlink:title="ifrs-full_SegmentsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain" xlink:label="ifrs-full_SegmentsDomain_1" xlink:title="ifrs-full_SegmentsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_SegmentsAxis_1" xlink:to="ifrs-full_SegmentsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_SegmentsAxis_1 To ifrs-full_SegmentsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementAxis" xlink:label="himx_IncomeStatementAxis_1" xlink:title="himx_IncomeStatementAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementDomain" xlink:label="himx_IncomeStatementDomain_1" xlink:title="himx_IncomeStatementDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_IncomeStatementAxis_1" xlink:to="himx_IncomeStatementDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_IncomeStatementAxis_1 To himx_IncomeStatementDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EffectOfTransitionAxis" xlink:label="himx_EffectOfTransitionAxis_1" xlink:title="himx_EffectOfTransitionAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EffectOfTransitionDomain" xlink:label="himx_EffectOfTransitionDomain_1" xlink:title="himx_EffectOfTransitionDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_EffectOfTransitionAxis_1" xlink:to="himx_EffectOfTransitionDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_EffectOfTransitionAxis_1 To himx_EffectOfTransitionDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressesAddressTypeAxis" xlink:label="dei_EntityAddressesAddressTypeAxis_1" xlink:title="dei_EntityAddressesAddressTypeAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain" xlink:label="dei_AddressTypeDomain_1" xlink:title="dei_AddressTypeDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="dei_EntityAddressesAddressTypeAxis_1" xlink:to="dei_AddressTypeDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:dei_EntityAddressesAddressTypeAxis_1 To dei_AddressTypeDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis" xlink:label="ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis_1" xlink:title="ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain" xlink:label="ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain_1" xlink:title="ifrs-full_CharacteristicsOfDefinedBenefitPlansMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis_1" xlink:to="ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis_1 To ifrs-full_CharacteristicsOfDefinedBenefitPlansMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingAndDiscontinuedOperationsAxis" xlink:label="ifrs-full_ContinuingAndDiscontinuedOperationsAxis_1" xlink:title="ifrs-full_ContinuingAndDiscontinuedOperationsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingOperationsMember" xlink:label="ifrs-full_ContinuingOperationsMember_1" xlink:title="ifrs-full_ContinuingOperationsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ContinuingAndDiscontinuedOperationsAxis_1" xlink:to="ifrs-full_ContinuingOperationsMember_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ContinuingAndDiscontinuedOperationsAxis_1 To ifrs-full_ContinuingOperationsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanAxis" xlink:label="himx_StockOptionPlanAxis_1" xlink:title="himx_StockOptionPlanAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanDomain" xlink:label="himx_StockOptionPlanDomain_1" xlink:title="himx_StockOptionPlanDomain_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis" xlink:label="ifrs-full_ClassesOfFinancialInstrumentsAxis_1" xlink:title="ifrs-full_ClassesOfFinancialInstrumentsAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain" xlink:label="ifrs-full_ClassesOfFinancialInstrumentsDomain_1" xlink:title="ifrs-full_ClassesOfFinancialInstrumentsMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ClassesOfFinancialInstrumentsAxis_1" xlink:to="ifrs-full_ClassesOfFinancialInstrumentsDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ClassesOfFinancialInstrumentsAxis_1 To ifrs-full_ClassesOfFinancialInstrumentsMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis_1" xlink:title="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_1" xlink:title="ifrs-full_LineItemsByFunctionMember_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis_1" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis_1 To ifrs-full_LineItemsByFunctionMember_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityAxis" xlink:label="himx_IfrsLegalEntityAxis_1" xlink:title="himx_IfrsLegalEntityAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityDomain" xlink:label="himx_IfrsLegalEntityDomain_1" xlink:title="himx_IfrsLegalEntityDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_IfrsLegalEntityAxis_1" xlink:to="himx_IfrsLegalEntityDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_IfrsLegalEntityAxis_1 To himx_IfrsLegalEntityDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsSensitivityAnalysisToDefinedBenefitPlanAxis" xlink:label="himx_IfrsSensitivityAnalysisToDefinedBenefitPlanAxis_1" xlink:title="himx_IfrsSensitivityAnalysisToDefinedBenefitPlanAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsSensitivityAnalysisToDefinedBenefitPlanDomain" xlink:label="himx_IfrsSensitivityAnalysisToDefinedBenefitPlanDomain_1" xlink:title="himx_IfrsSensitivityAnalysisToDefinedBenefitPlanDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_IfrsSensitivityAnalysisToDefinedBenefitPlanAxis_1" xlink:to="himx_IfrsSensitivityAnalysisToDefinedBenefitPlanDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_IfrsSensitivityAnalysisToDefinedBenefitPlanAxis_1 To himx_IfrsSensitivityAnalysisToDefinedBenefitPlanDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsIssuerEquityTypeAxis" xlink:label="himx_IfrsIssuerEquityTypeAxis_1" xlink:title="himx_IfrsIssuerEquityTypeAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsIssuerEquityTypeDomain" xlink:label="himx_IfrsIssuerEquityTypeDomain_1" xlink:title="himx_IfrsIssuerEquityTypeDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_IfrsIssuerEquityTypeAxis_1" xlink:to="himx_IfrsIssuerEquityTypeDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_IfrsIssuerEquityTypeAxis_1 To himx_IfrsIssuerEquityTypeDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsCategoriesOfItemsPurchaseAxis" xlink:label="himx_IfrsCategoriesOfItemsPurchaseAxis_1" xlink:title="himx_IfrsCategoriesOfItemsPurchaseAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsCategoriesOfItemsPurchaseDomain" xlink:label="himx_IfrsCategoriesOfItemsPurchaseDomain_1" xlink:title="himx_IfrsCategoriesOfItemsPurchaseDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_IfrsCategoriesOfItemsPurchaseAxis_1" xlink:to="himx_IfrsCategoriesOfItemsPurchaseDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_IfrsCategoriesOfItemsPurchaseAxis_1 To himx_IfrsCategoriesOfItemsPurchaseDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStockOptionVestingAxis" xlink:label="himx_IfrsStockOptionVestingAxis_1" xlink:title="himx_IfrsStockOptionVestingAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStockOptionVestingDomain" xlink:label="himx_IfrsStockOptionVestingDomain_1" xlink:title="himx_IfrsStockOptionVestingDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_IfrsStockOptionVestingAxis_1" xlink:to="himx_IfrsStockOptionVestingDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_IfrsStockOptionVestingAxis_1 To himx_IfrsStockOptionVestingDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsClassOfStockAxis" xlink:label="himx_IfrsClassOfStockAxis_1" xlink:title="himx_IfrsClassOfStockAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsClassOfStockDomain" xlink:label="himx_IfrsClassOfStockDomain_1" xlink:title="himx_IfrsClassOfStockDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_IfrsClassOfStockAxis_1" xlink:to="himx_IfrsClassOfStockDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_IfrsClassOfStockAxis_1 To himx_IfrsClassOfStockDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:label="ifrs-full_ClassesOfFinancialLiabilitiesAxis_1" xlink:title="ifrs-full_ClassesOfFinancialLiabilitiesAxis_1" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" xlink:title="ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="ifrs-full_ClassesOfFinancialLiabilitiesAxis_1" xlink:to="ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:ifrs-full_ClassesOfFinancialLiabilitiesAxis_1 To ifrs-full_ClassesOfFinancialLiabilitiesDomain_1" order="1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsVestingAxis" xlink:label="himx_IfrsVestingAxis_1" xlink:title="himx_IfrsVestingAxis_1" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsVestingDomain" xlink:label="himx_IfrsVestingDomain_1" xlink:title="himx_IfrsVestingDomain_1" />
    <link:definitionArc xlink:type="arc" xlink:from="himx_IfrsVestingAxis_1" xlink:to="himx_IfrsVestingDomain_1" use="optional" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:title="definition:himx_IfrsVestingAxis_1 To himx_IfrsVestingDomain_1" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DocumentDocumentAndEntityInformation" xlink:type="extended" xlink:title="995200090 - Document - Document and Entity Information">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable" xlink:label="dei_DocumentInformationTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressesAddressTypeAxis" xlink:label="dei_EntityAddressesAddressTypeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="dei_DocumentInformationTable" xlink:to="dei_EntityAddressesAddressTypeAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain" xlink:label="dei_AddressTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_EntityAddressesAddressTypeAxis" xlink:to="dei_AddressTypeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain" xlink:label="dei_AddressTypeDomain_639101987908128454" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="dei_EntityAddressesAddressTypeAxis" xlink:to="dei_AddressTypeDomain_639101987908128454" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_BusinessContactMember" xlink:label="dei_BusinessContactMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_AddressTypeDomain" xlink:to="dei_BusinessContactMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems" xlink:label="dei_DocumentInformationLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentInformationTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType" xlink:label="dei_DocumentType" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentType" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentRegistrationStatement" xlink:label="dei_DocumentRegistrationStatement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentRegistrationStatement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport" xlink:label="dei_DocumentAnnualReport" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentAnnualReport" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentPeriodEndDate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport" xlink:label="dei_DocumentTransitionReport" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentTransitionReport" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentShellCompanyReport" xlink:label="dei_DocumentShellCompanyReport" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentShellCompanyReport" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityFileNumber" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityRegistrantName" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityIncorporationStateCountryCode" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressAddressLine1" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2" xlink:label="dei_EntityAddressAddressLine2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressAddressLine2" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown" xlink:label="dei_EntityAddressCityOrTown" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressCityOrTown" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressPostalZipCode" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCountry" xlink:label="dei_EntityAddressCountry" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressCountry" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ContactPersonnelName" xlink:label="dei_ContactPersonnelName" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_ContactPersonnelName" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber" xlink:label="dei_LocalPhoneNumber" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_LocalPhoneNumber" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ContactPersonnelEmailAddress" xlink:label="dei_ContactPersonnelEmailAddress" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_ContactPersonnelEmailAddress" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ContactPersonnelFaxNumber" xlink:label="dei_ContactPersonnelFaxNumber" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_ContactPersonnelFaxNumber" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode" xlink:label="dei_CityAreaCode" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_CityAreaCode" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_Security12bTitle" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_TradingSymbol" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_SecurityExchangeName" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="dei_EntityCommonStockSharesOutstanding" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="24" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCommonStockSharesOutstanding" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="dei_EntityWellKnownSeasonedIssuer" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="25" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityWellKnownSeasonedIssuer" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityVoluntaryFilers" xlink:label="dei_EntityVoluntaryFilers" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="26" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityVoluntaryFilers" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus" xlink:label="dei_EntityCurrentReportingStatus" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="27" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCurrentReportingStatus" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent" xlink:label="dei_EntityInteractiveDataCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="28" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityInteractiveDataCurrent" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory" xlink:label="dei_EntityFilerCategory" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="29" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityFilerCategory" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="30" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityEmergingGrowthCompany" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_IcfrAuditorAttestationFlag" xlink:label="dei_IcfrAuditorAttestationFlag" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="31" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_IcfrAuditorAttestationFlag" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFinStmtErrorCorrectionFlag" xlink:label="dei_DocumentFinStmtErrorCorrectionFlag" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="32" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentFinStmtErrorCorrectionFlag" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAccountingStandard" xlink:label="dei_DocumentAccountingStandard" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="33" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentAccountingStandard" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany" xlink:label="dei_EntityShellCompany" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="34" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityShellCompany" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorName" xlink:label="dei_AuditorName" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="35" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_AuditorName" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorFirmId" xlink:label="dei_AuditorFirmId" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="36" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_AuditorFirmId" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorLocation" xlink:label="dei_AuditorLocation" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="37" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_AuditorLocation" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="38" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCentralIndexKey" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="39" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_CurrentFiscalYearEndDate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="40" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentFiscalYearFocus" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="41" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentFiscalPeriodFocus" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="42" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_AmendmentFlag" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/StatementConsolidatedStatementsOfChangesInEquity" xlink:type="extended" xlink:title="995200400 - Statement - Consolidated Statements of Changes in Equity">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987908292822" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987908292822" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember" xlink:label="ifrs-full_OrdinarySharesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_OrdinarySharesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionalPaidinCapitalMember" xlink:label="ifrs-full_AdditionalPaidinCapitalMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_AdditionalPaidinCapitalMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TreasurySharesMember" xlink:label="ifrs-full_TreasurySharesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_TreasurySharesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedOtherComprehensiveIncomeMember" xlink:label="ifrs-full_AccumulatedOtherComprehensiveIncomeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_AccumulatedOtherComprehensiveIncomeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetainedEarningsMember" xlink:label="ifrs-full_RetainedEarningsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_RetainedEarningsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_EquityAttributableToOwnersOfParentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncontrollingInterestsMember" xlink:label="ifrs-full_NoncontrollingInterestsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_NoncontrollingInterestsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity" xlink:label="ifrs-full_Equity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_Equity" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding" xlink:label="ifrs-full_NumberOfSharesOutstanding" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_NumberOfSharesOutstanding" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProfitLoss" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="ifrs-full_OtherComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_OtherComprehensiveIncome" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComprehensiveIncome" xlink:label="ifrs-full_ComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ComprehensiveIncome" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:label="himx_ContributionsByAndDistributionsToOwnersAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_ContributionsByAndDistributionsToOwnersAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchaseOfTreasuryShares" xlink:label="ifrs-full_PurchaseOfTreasuryShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="ifrs-full_PurchaseOfTreasuryShares" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsTreasuryStockSharesAcquired" xlink:label="himx_IfrsTreasuryStockSharesAcquired" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="himx_IfrsTreasuryStockSharesAcquired" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DividendsRecognisedAsDistributionToOwnersOfParent" xlink:label="himx_DividendsRecognisedAsDistributionToOwnersOfParent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="himx_DividendsRecognisedAsDistributionToOwnersOfParent" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DividendsEquivalentRecognisedAsDistributionToOwnersOfParent" xlink:label="himx_DividendsEquivalentRecognisedAsDistributionToOwnersOfParent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="himx_DividendsEquivalentRecognisedAsDistributionToOwnersOfParent" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests" xlink:label="ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:label="ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RestrictedStockVestedValue" xlink:label="himx_RestrictedStockVestedValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="himx_RestrictedStockVestedValue" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RestrictedStockVestedShares" xlink:label="himx_RestrictedStockVestedShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="himx_RestrictedStockVestedShares" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AggregateValueContributionByDistributionToOwners" xlink:label="himx_AggregateValueContributionByDistributionToOwners" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="himx_AggregateValueContributionByDistributionToOwners" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AggregateOfSharesContributionByDistributionToOwners" xlink:label="himx_AggregateOfSharesContributionByDistributionToOwners" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="himx_ContributionsByAndDistributionsToOwnersAbstract" xlink:to="himx_AggregateOfSharesContributionByDistributionToOwners" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ChangesInOwnershipInterestsAbstract" xlink:label="himx_ChangesInOwnershipInterestsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_ChangesInOwnershipInterestsAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughChangeInEquityOfSubsidiaries" xlink:label="ifrs-full_IncreaseDecreaseThroughChangeInEquityOfSubsidiaries" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_ChangesInOwnershipInterestsAbstract" xlink:to="ifrs-full_IncreaseDecreaseThroughChangeInEquityOfSubsidiaries" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainLossOnCessationOfConsolidationOfSubsidiariesDueToChangeOfInvestmentEntityStatus" xlink:label="ifrs-full_GainLossOnCessationOfConsolidationOfSubsidiariesDueToChangeOfInvestmentEntityStatus" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_ChangesInOwnershipInterestsAbstract" xlink:to="ifrs-full_GainLossOnCessationOfConsolidationOfSubsidiariesDueToChangeOfInvestmentEntityStatus" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" xlink:label="ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_ChangesInOwnershipInterestsAbstract" xlink:to="ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AcquiredControllingPowerFromNoncontrollingInterestEquity" xlink:label="himx_AcquiredControllingPowerFromNoncontrollingInterestEquity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_ChangesInOwnershipInterestsAbstract" xlink:to="himx_AcquiredControllingPowerFromNoncontrollingInterestEquity" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LiquidationOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeEquity" xlink:label="himx_LiquidationOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeEquity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_ChangesInOwnershipInterestsAbstract" xlink:to="himx_LiquidationOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeEquity" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AggregateAmountOfChangesInOwnershipInterests" xlink:label="himx_AggregateAmountOfChangesInOwnershipInterests" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_ChangesInOwnershipInterestsAbstract" xlink:to="himx_AggregateAmountOfChangesInOwnershipInterests" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnly" xlink:type="extended" xlink:title="995213001 - Disclosure - Himax Technologies, Inc. (the Parent Company only)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987908292822" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987908292822" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_EquityAttributableToOwnersOfParentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory" xlink:label="ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureShareBasedCompensationTables" xlink:type="extended" xlink:title="99931903 - Disclosure - Share-Based Compensation (Tables)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityAxis" xlink:label="himx_IfrsLegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_IfrsLegalEntityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityDomain" xlink:label="himx_IfrsLegalEntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IfrsLegalEntityAxis" xlink:to="himx_IfrsLegalEntityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityDomain" xlink:label="himx_IfrsLegalEntityDomain_639101987908292822" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IfrsLegalEntityAxis" xlink:to="himx_IfrsLegalEntityDomain_639101987908292822" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CmVisualTechnologyCorpMember" xlink:label="himx_CmVisualTechnologyCorpMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_CmVisualTechnologyCorpMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LiqxtalTechnologyIncMember" xlink:label="himx_LiqxtalTechnologyIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_LiqxtalTechnologyIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedCompensationExpensesIncludedCostOfSalesTableTextBlock" xlink:label="himx_DisclosureOfShareBasedCompensationExpensesIncludedCostOfSalesTableTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfShareBasedCompensationExpensesIncludedCostOfSalesTableTextBlock" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfRSUTableTextBlock" xlink:label="himx_DisclosureOfRSUTableTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfRSUTableTextBlock" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfRSUCompensationExpensesTableTextBlock" xlink:label="himx_DisclosureOfRSUCompensationExpensesTableTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfRSUCompensationExpensesTableTextBlock" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareBasedCompensationShareOptionsValuationAssumptionsTableTextBlock" xlink:label="himx_ShareBasedCompensationShareOptionsValuationAssumptionsTableTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_ShareBasedCompensationShareOptionsValuationAssumptionsTableTextBlock" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareBasedCompensationStockOptionActivityTableTextBlock" xlink:label="himx_ShareBasedCompensationStockOptionActivityTableTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_ShareBasedCompensationStockOptionActivityTableTextBlock" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyTables" xlink:type="extended" xlink:title="99933003 - Disclosure - Himax Technologies, Inc. (the Parent Company only) (Tables)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987908292822" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987908292822" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_EquityAttributableToOwnersOfParentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfDetailedInformationAboutCondensedStatementsOfFinancialPositionTextBlock" xlink:label="himx_DisclosureOfDetailedInformationAboutCondensedStatementsOfFinancialPositionTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_DisclosureOfDetailedInformationAboutCondensedStatementsOfFinancialPositionTextBlock" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfDetailedInformationAboutStatementOfProfitOrLossTextBlock" xlink:label="himx_DisclosureOfDetailedInformationAboutStatementOfProfitOrLossTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_DisclosureOfDetailedInformationAboutStatementOfProfitOrLossTextBlock" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfDetailedInformationAboutStatementOfOtherComprehensiveIncomeTextBlock" xlink:label="himx_DisclosureOfDetailedInformationAboutStatementOfOtherComprehensiveIncomeTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_DisclosureOfDetailedInformationAboutStatementOfOtherComprehensiveIncomeTextBlock" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfDetailedInformationAboutStatementOfCashFlowsTextBlock" xlink:label="himx_DisclosureOfDetailedInformationAboutStatementOfCashFlowsTextBlock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_DisclosureOfDetailedInformationAboutStatementOfCashFlowsTextBlock" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureApplicationOfNewAndRevisedIfrsAsIssuedByIasbDetails" xlink:type="extended" xlink:title="99940301 - Disclosure - Application of new and revised IFRS as issued by the IASB (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsAxis" xlink:label="ifrs-full_NewIFRSsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_NewIFRSsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsDomain" xlink:label="ifrs-full_NewIFRSsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_NewIFRSsAxis" xlink:to="ifrs-full_NewIFRSsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsDomain" xlink:label="ifrs-full_NewIFRSsDomain_639101987908292822" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_NewIFRSsAxis" xlink:to="ifrs-full_NewIFRSsDomain_639101987908292822" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_Ifrs19SubsidiariesWithoutPublicAccountabilityDisclosuresAndAmendmentsMember" xlink:label="himx_Ifrs19SubsidiariesWithoutPublicAccountabilityDisclosuresAndAmendmentsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_NewIFRSsDomain" xlink:to="himx_Ifrs19SubsidiariesWithoutPublicAccountabilityDisclosuresAndAmendmentsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AmendmentsToIFRS10AndIAS28MemberMember" xlink:label="himx_AmendmentsToIFRS10AndIAS28MemberMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_NewIFRSsDomain" xlink:to="himx_AmendmentsToIFRS10AndIAS28MemberMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AmendmentsToIas21LackOfExchangeabilityMember" xlink:label="himx_AmendmentsToIas21LackOfExchangeabilityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_NewIFRSsDomain" xlink:to="himx_AmendmentsToIas21LackOfExchangeabilityMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AmendmentsToIfrs9AndIfrs7ClassificationAndMeasurementOfFinancialInstrumentsMember" xlink:label="himx_AmendmentsToIfrs9AndIfrs7ClassificationAndMeasurementOfFinancialInstrumentsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_NewIFRSsDomain" xlink:to="himx_AmendmentsToIfrs9AndIfrs7ClassificationAndMeasurementOfFinancialInstrumentsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AnnualImprovementsToIfrsAccountingStandardsVolume11Member" xlink:label="himx_AnnualImprovementsToIfrsAccountingStandardsVolume11Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_NewIFRSsDomain" xlink:to="himx_AnnualImprovementsToIfrsAccountingStandardsVolume11Member" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_Ifrs18PresentationAndDisclosureInFinancialStatementsMember" xlink:label="himx_Ifrs18PresentationAndDisclosureInFinancialStatementsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_NewIFRSsDomain" xlink:to="himx_Ifrs18PresentationAndDisclosureInFinancialStatementsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TitleOfNewIFRS" xlink:label="ifrs-full_TitleOfNewIFRS" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_TitleOfNewIFRS" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DateByWhichApplicationOfNewIFRSIsRequired" xlink:label="ifrs-full_DateByWhichApplicationOfNewIFRSIsRequired" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DateByWhichApplicationOfNewIFRSIsRequired" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DeterminationSubjectToIASBApproval" xlink:label="himx_DeterminationSubjectToIASBApproval" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_DeterminationSubjectToIASBApproval" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureMaterialAccountingPoliciesDetails" xlink:type="extended" xlink:title="99940401 - Disclosure - Material accounting policies (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="ifrs-full_GeographicalAreasAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_GeographicalAreasAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="ifrs-full_GeographicalAreasDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_GeographicalAreasAxis" xlink:to="ifrs-full_GeographicalAreasDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="ifrs-full_GeographicalAreasDomain_639101987908292822" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_GeographicalAreasAxis" xlink:to="ifrs-full_GeographicalAreasDomain_639101987908292822" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_RU" xlink:label="country_RU" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_RU" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN" xlink:label="country_CN" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_CN" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_KR" xlink:label="country_KR" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_KR" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP" xlink:label="country_JP" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_JP" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK" xlink:label="country_HK" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_HK" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_WS" xlink:label="country_WS" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_WS" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_VG" xlink:label="country_VG" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_VG" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DelawareUSAMember" xlink:label="himx_DelawareUSAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="himx_DelawareUSAMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_KY" xlink:label="country_KY" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_KY" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CaliforniaUSAMember" xlink:label="himx_CaliforniaUSAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="himx_CaliforniaUSAMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="ifrs-full_SignificantInvestmentsInSubsidiariesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_SignificantInvestmentsInSubsidiariesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:to="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:label="ifrs-full_SignificantInvestmentsInSubsidiariesDomain_639101987908292822" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:to="ifrs-full_SignificantInvestmentsInSubsidiariesDomain_639101987908292822" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxTechnologiesLimitedHimaxTaiwanMember" xlink:label="himx_HimaxTechnologiesLimitedHimaxTaiwanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxTechnologiesLimitedHimaxTaiwanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxTechnologiesKoreaLtdMember" xlink:label="himx_HimaxTechnologiesKoreaLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxTechnologiesKoreaLtdMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxTechnologiesJapanLtdMember" xlink:label="himx_HimaxTechnologiesJapanLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxTechnologiesJapanLtdMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxSemiconductorHongKongLimitedMember" xlink:label="himx_HimaxSemiconductorHongKongLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxSemiconductorHongKongLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ViewsilTechnologyLimitedMember" xlink:label="himx_ViewsilTechnologyLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_ViewsilTechnologyLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxTechnologiesSamoaIncMember" xlink:label="himx_HimaxTechnologiesSamoaIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxTechnologiesSamoaIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxTechnologiesSuzhouCoLtdMember" xlink:label="himx_HimaxTechnologiesSuzhouCoLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxTechnologiesSuzhouCoLtdMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxTechnologiesShenzhenCoLtdMember" xlink:label="himx_HimaxTechnologiesShenzhenCoLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxTechnologiesShenzhenCoLtdMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxDisplayIncMember" xlink:label="himx_HimaxDisplayIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxDisplayIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IntegratedMicrodisplaysLimitedMember" xlink:label="himx_IntegratedMicrodisplaysLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_IntegratedMicrodisplaysLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxDisplayUSAIncMember" xlink:label="himx_HimaxDisplayUSAIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxDisplayUSAIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxAnalogicIncMember" xlink:label="himx_HimaxAnalogicIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxAnalogicIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxImagingIncMember" xlink:label="himx_HimaxImagingIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxImagingIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxImagingLtdImagingTaiwanMember" xlink:label="himx_HimaxImagingLtdImagingTaiwanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxImagingLtdImagingTaiwanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxImagingCorpMember" xlink:label="himx_HimaxImagingCorpMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxImagingCorpMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NewKenTechnologiesCoLtdMember" xlink:label="himx_NewKenTechnologiesCoLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_NewKenTechnologiesCoLtdMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HarvestInvestmentLimitedMember" xlink:label="himx_HarvestInvestmentLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HarvestInvestmentLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LiqxtalTechnologyIncMember" xlink:label="himx_LiqxtalTechnologyIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_LiqxtalTechnologyIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxIGIPrecisionLtdMember" xlink:label="himx_HimaxIGIPrecisionLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_HimaxIGIPrecisionLtdMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CmVisualTechnologyCorpMember" xlink:label="himx_CmVisualTechnologyCorpMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_CmVisualTechnologyCorpMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_SolvantaInvestmentLimitedMember" xlink:label="himx_SolvantaInvestmentLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_SolvantaInvestmentLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_SolvantaEnergyLimitedMember" xlink:label="himx_SolvantaEnergyLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_SolvantaEnergyLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ViewsilMicroelectronicsShanghaiLimitedMember" xlink:label="himx_ViewsilMicroelectronicsShanghaiLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="himx_ViewsilMicroelectronicsShanghaiLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="ifrs-full_BusinessCombinationsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_BusinessCombinationsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="ifrs-full_BusinessCombinationsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_BusinessCombinationsAxis" xlink:to="ifrs-full_BusinessCombinationsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="ifrs-full_BusinessCombinationsDomain_639101987908292822" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_BusinessCombinationsAxis" xlink:to="ifrs-full_BusinessCombinationsDomain_639101987908292822" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ViewsilMicroelectronicsKunshanLimitedMember" xlink:label="himx_ViewsilMicroelectronicsKunshanLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_BusinessCombinationsDomain" xlink:to="himx_ViewsilMicroelectronicsKunshanLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NameOfParentEntity" xlink:label="ifrs-full_NameOfParentEntity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_NameOfParentEntity" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NameOfSubsidiary" xlink:label="ifrs-full_NameOfSubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_NameOfSubsidiary" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NatureOfBusiness" xlink:label="himx_NatureOfBusiness" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_NatureOfBusiness" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary" xlink:label="ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:label="ifrs-full_ProportionOfOwnershipInterestInSubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProportionOfOwnershipInterestInSubsidiary" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfVotingPowerHeldInAssociate" xlink:label="ifrs-full_ProportionOfVotingPowerHeldInAssociate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProportionOfVotingPowerHeldInAssociate" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureMaterialAccountingPoliciesAdditionalInformationDetails" xlink:type="extended" xlink:title="99940404 - Disclosure - Material accounting policies - Additional information (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987908445687" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987908445687" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BuildingsMember" xlink:label="ifrs-full_BuildingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_BuildingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_BuildingsImprovementsMember" xlink:label="himx_BuildingsImprovementsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="himx_BuildingsImprovementsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MachineryMember" xlink:label="ifrs-full_MachineryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_MachineryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ResearchAndDevelopmentEquipmentMember" xlink:label="himx_ResearchAndDevelopmentEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="himx_ResearchAndDevelopmentEquipmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FixturesAndFittingsMember" xlink:label="ifrs-full_FixturesAndFittingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_FixturesAndFittingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:label="ifrs-full_OtherPropertyPlantAndEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_OtherPropertyPlantAndEquipmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EmbeddedSoftwareMember" xlink:label="himx_EmbeddedSoftwareMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="himx_EmbeddedSoftwareMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LegalEntityAxisAxis" xlink:label="himx_LegalEntityAxisAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="himx_LegalEntityAxisAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LegalEntityDomain" xlink:label="himx_LegalEntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_LegalEntityAxisAxis" xlink:to="himx_LegalEntityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LegalEntityDomain" xlink:label="himx_LegalEntityDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_LegalEntityAxisAxis" xlink:to="himx_LegalEntityDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxSemiConductorMember" xlink:label="himx_HimaxSemiConductorMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_LegalEntityDomain" xlink:to="himx_HimaxSemiConductorMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxDisplayUSAIncMember" xlink:label="himx_HimaxDisplayUSAIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_LegalEntityDomain" xlink:to="himx_HimaxDisplayUSAIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComputerSoftwareMember" xlink:label="ifrs-full_ComputerSoftwareMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="ifrs-full_ComputerSoftwareMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:label="ifrs-full_TechnologybasedIntangibleAssetsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="ifrs-full_TechnologybasedIntangibleAssetsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IntellectualPropertiesMember" xlink:label="himx_IntellectualPropertiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="himx_IntellectualPropertiesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis" xlink:label="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain" xlink:label="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis" xlink:to="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain" xlink:label="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis" xlink:to="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DriverICCGUMember" xlink:label="himx_DriverICCGUMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain" xlink:to="himx_DriverICCGUMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_WLOCGUMember" xlink:label="himx_WLOCGUMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain" xlink:to="himx_WLOCGUMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_RangeAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember" xlink:label="ifrs-full_BottomOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_BottomOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="ifrs-full_TopOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_TopOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AssetsAcquiredUsefulLife" xlink:label="himx_AssetsAcquiredUsefulLife" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_AssetsAcquiredUsefulLife" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsNumberOfOperatingSegments" xlink:label="himx_IfrsNumberOfOperatingSegments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsNumberOfOperatingSegments" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" xlink:label="ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections" xlink:label="ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GoodwillRecognisedAsOfAcquisitionDate" xlink:label="ifrs-full_GoodwillRecognisedAsOfAcquisitionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_GoodwillRecognisedAsOfAcquisitionDate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_UsefulLifeOfTangibleAssets" xlink:label="himx_UsefulLifeOfTangibleAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_UsefulLifeOfTangibleAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PeriodForAverageEconomicGrowthRate" xlink:label="himx_PeriodForAverageEconomicGrowthRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_PeriodForAverageEconomicGrowthRate" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureConsolidationAdditionalInformationDetails" xlink:type="extended" xlink:title="99940501 - Disclosure - Consolidation - Additional information (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="ifrs-full_BusinessCombinationsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_BusinessCombinationsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="ifrs-full_BusinessCombinationsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_BusinessCombinationsAxis" xlink:to="ifrs-full_BusinessCombinationsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="ifrs-full_BusinessCombinationsDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_BusinessCombinationsAxis" xlink:to="ifrs-full_BusinessCombinationsDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ViewsilMicroelectronicsKunshanLimitedMember" xlink:label="himx_ViewsilMicroelectronicsKunshanLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_BusinessCombinationsDomain" xlink:to="himx_ViewsilMicroelectronicsKunshanLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OtherGainsLossesMember" xlink:label="himx_OtherGainsLossesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="himx_OtherGainsLossesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfVotingPowerHeldInAssociate" xlink:label="ifrs-full_ProportionOfVotingPowerHeldInAssociate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProportionOfVotingPowerHeldInAssociate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NumberOfBoardMembersInAssociates" xlink:label="himx_NumberOfBoardMembersInAssociates" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_NumberOfBoardMembersInAssociates" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NumberOfBoardMembersThatEntityHasRightToAssignInAssociates" xlink:label="himx_NumberOfBoardMembersThatEntityHasRightToAssignInAssociates" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_NumberOfBoardMembersThatEntityHasRightToAssignInAssociates" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LossOnReMeasurementOfBusinessCombination" xlink:label="himx_LossOnReMeasurementOfBusinessCombination" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_LossOnReMeasurementOfBusinessCombination" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueOfCombinedEntity" xlink:label="ifrs-full_RevenueOfCombinedEntity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_RevenueOfCombinedEntity" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossOfCombinedEntity" xlink:label="ifrs-full_ProfitLossOfCombinedEntity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProfitLossOfCombinedEntity" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureConsolidationEstimatedFairValueOfAssetsAcquiredAndLiabilitiesDetails" xlink:type="extended" xlink:title="99940502 - Disclosure - Consolidation - Estimated fair value of assets acquired and liabilities (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="ifrs-full_BusinessCombinationsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_BusinessCombinationsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="ifrs-full_BusinessCombinationsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_BusinessCombinationsAxis" xlink:to="ifrs-full_BusinessCombinationsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain" xlink:label="ifrs-full_BusinessCombinationsDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_BusinessCombinationsAxis" xlink:to="ifrs-full_BusinessCombinationsDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ViewsilMicroelectronicsKunshanLimitedMember" xlink:label="himx_ViewsilMicroelectronicsKunshanLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_BusinessCombinationsDomain" xlink:to="himx_ViewsilMicroelectronicsKunshanLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:label="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:label="ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:to="ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:label="ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:to="ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OtherAssetsRecognisedAsOfAcquisitionDate" xlink:label="himx_OtherAssetsRecognisedAsOfAcquisitionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:to="himx_OtherAssetsRecognisedAsOfAcquisitionDate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:label="ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:to="ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" xlink:label="ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:to="ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate" xlink:label="ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:to="ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:label="ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract" xlink:to="ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialAssetsAtFairValueThroughProfitOrLossDetails" xlink:type="extended" xlink:title="99940801 - Disclosure - Financial Assets at Fair Value Through Profit or Loss (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis" xlink:label="ifrs-full_ClassesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfFinancialAssetsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="ifrs-full_ClassesOfFinancialAssetsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="ifrs-full_ClassesOfFinancialAssetsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="ifrs-full_ClassesOfFinancialAssetsDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="ifrs-full_ClassesOfFinancialAssetsDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_MoneyMarketFundMember" xlink:label="himx_MoneyMarketFundMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="himx_MoneyMarketFundMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EquitySecuritiesUnlistedCompanyMember" xlink:label="himx_EquitySecuritiesUnlistedCompanyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="himx_EquitySecuritiesUnlistedCompanyMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WarrantsMember" xlink:label="ifrs-full_WarrantsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="ifrs-full_WarrantsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:label="ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CurrentFinancialAssetsAtFairValueThroughProfitOrLoss" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:label="ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss" xlink:label="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeDetails" xlink:type="extended" xlink:title="99940901 - Disclosure - Financial Assets at Fair Value Through Other Comprehensive Income (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis" xlink:label="ifrs-full_ClassesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfFinancialAssetsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="ifrs-full_ClassesOfFinancialAssetsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="ifrs-full_ClassesOfFinancialAssetsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="ifrs-full_ClassesOfFinancialAssetsDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="ifrs-full_ClassesOfFinancialAssetsDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityInvestmentsMember" xlink:label="ifrs-full_EquityInvestmentsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="ifrs-full_EquityInvestmentsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncome" xlink:label="ifrs-full_FairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_FairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncome" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureAccountsReceivableNetIncludingRelatedPartiesAnalysisOfExpectedCreditLossesDetails" xlink:type="extended" xlink:title="99941002 - Disclosure - Accounts Receivable, net (including related parties) - Analysis of expected credit losses (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PastDueStatusAxis" xlink:label="ifrs-full_PastDueStatusAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_PastDueStatusAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PastDueStatusDomain" xlink:label="ifrs-full_PastDueStatusDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_PastDueStatusAxis" xlink:to="ifrs-full_PastDueStatusDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PastDueStatusDomain" xlink:label="ifrs-full_PastDueStatusDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_PastDueStatusAxis" xlink:to="ifrs-full_PastDueStatusDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NoPastDueMember" xlink:label="himx_NoPastDueMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_PastDueStatusDomain" xlink:to="himx_NoPastDueMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentMember" xlink:label="ifrs-full_CurrentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_PastDueStatusDomain" xlink:to="ifrs-full_CurrentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember" xlink:label="ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_PastDueStatusDomain" xlink:to="ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember" xlink:label="ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_PastDueStatusDomain" xlink:to="ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LaterThanNinetyOneDaysAndNotLaterThanOneHundredAndTwentyDaysMember" xlink:label="himx_LaterThanNinetyOneDaysAndNotLaterThanOneHundredAndTwentyDaysMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_PastDueStatusDomain" xlink:to="himx_LaterThanNinetyOneDaysAndNotLaterThanOneHundredAndTwentyDaysMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LaterThanOneHundredAndTwentyOneDaysMember" xlink:label="himx_LaterThanOneHundredAndTwentyOneDaysMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_PastDueStatusDomain" xlink:to="himx_LaterThanOneHundredAndTwentyOneDaysMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_RangeAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember" xlink:label="ifrs-full_BottomOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_BottomOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="ifrs-full_TopOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_TopOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeAndOtherReceivables" xlink:label="ifrs-full_TradeAndOtherReceivables" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_TradeAndOtherReceivables" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpectedCreditLossRate" xlink:label="ifrs-full_ExpectedCreditLossRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ExpectedCreditLossRate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LifetimeExpectedCreditLosses" xlink:label="himx_LifetimeExpectedCreditLosses" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_LifetimeExpectedCreditLosses" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureEquityMethodInvestmentsDetails" xlink:type="extended" xlink:title="99941201 - Disclosure - Equity Method Investments (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis" xlink:label="ifrs-full_SignificantInvestmentsInAssociatesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_SignificantInvestmentsInAssociatesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:label="ifrs-full_SignificantInvestmentsInAssociatesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesAxis" xlink:to="ifrs-full_SignificantInvestmentsInAssociatesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:label="ifrs-full_SignificantInvestmentsInAssociatesDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesAxis" xlink:to="ifrs-full_SignificantInvestmentsInAssociatesDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_GanzinTechnologyCorpMember" xlink:label="himx_GanzinTechnologyCorpMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:to="himx_GanzinTechnologyCorpMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IrisOptronicsCoLtdMember" xlink:label="himx_IrisOptronicsCoLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:to="himx_IrisOptronicsCoLtdMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_TiltFiveIncMember" xlink:label="himx_TiltFiveIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:to="himx_TiltFiveIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PrilitOptronicsIncMember" xlink:label="himx_PrilitOptronicsIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:to="himx_PrilitOptronicsIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_GuangzhouPixtalksInformationTechnologyCoLtdMember" xlink:label="himx_GuangzhouPixtalksInformationTechnologyCoLtdMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:to="himx_GuangzhouPixtalksInformationTechnologyCoLtdMember" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CaluminoPtyLimitedMember" xlink:label="himx_CaluminoPtyLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:to="himx_CaluminoPtyLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PrincipalActivities" xlink:label="himx_PrincipalActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_PrincipalActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PrincipalPlaceOfBusinessOfAssociate" xlink:label="ifrs-full_PrincipalPlaceOfBusinessOfAssociate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_PrincipalPlaceOfBusinessOfAssociate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod" xlink:label="ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInAssociate" xlink:label="ifrs-full_ProportionOfOwnershipInterestInAssociate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProportionOfOwnershipInterestInAssociate" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureEquityMethodInvestmentsAdditionalInformationDetails" xlink:type="extended" xlink:title="99941203 - Disclosure - Equity Method Investments - Additional Information (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis" xlink:label="ifrs-full_SignificantInvestmentsInAssociatesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_SignificantInvestmentsInAssociatesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:label="ifrs-full_SignificantInvestmentsInAssociatesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesAxis" xlink:to="ifrs-full_SignificantInvestmentsInAssociatesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:label="ifrs-full_SignificantInvestmentsInAssociatesDomain_639101987908451087" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesAxis" xlink:to="ifrs-full_SignificantInvestmentsInAssociatesDomain_639101987908451087" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_GanzinTechnologyCorpMember" xlink:label="himx_GanzinTechnologyCorpMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_SignificantInvestmentsInAssociatesDomain" xlink:to="himx_GanzinTechnologyCorpMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_UnrecognizedGainLossInterestInEquityMethodInvestments" xlink:label="himx_UnrecognizedGainLossInterestInEquityMethodInvestments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_UnrecognizedGainLossInterestInEquityMethodInvestments" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CumulativeUnrecognizedGainLossInterestInEquityMethodInvestments" xlink:label="himx_CumulativeUnrecognizedGainLossInterestInEquityMethodInvestments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_CumulativeUnrecognizedGainLossInterestInEquityMethodInvestments" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EquityMethodInvestmentsPledgedAsCollateral" xlink:label="himx_EquityMethodInvestmentsPledgedAsCollateral" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_EquityMethodInvestmentsPledgedAsCollateral" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureOtherIntangibleAssetsDetails" xlink:type="extended" xlink:title="99941301 - Disclosure - Other Intangible Assets (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:label="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember" xlink:label="ifrs-full_CarryingAmountMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:to="ifrs-full_CarryingAmountMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember" xlink:label="ifrs-full_CarryingAmountMember_639101987908576309" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:to="ifrs-full_CarryingAmountMember_639101987908576309" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:label="ifrs-full_AccumulatedDepreciationAndAmortisationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CarryingAmountMember" xlink:to="ifrs-full_AccumulatedDepreciationAndAmortisationMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember" xlink:label="ifrs-full_GrossCarryingAmountMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CarryingAmountMember" xlink:to="ifrs-full_GrossCarryingAmountMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_639101987908576309" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_639101987908576309" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:label="ifrs-full_TechnologybasedIntangibleAssetsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="ifrs-full_TechnologybasedIntangibleAssetsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComputerSoftwareMember" xlink:label="ifrs-full_ComputerSoftwareMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="ifrs-full_ComputerSoftwareMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsOtherIntangibleAssetsMember" xlink:label="himx_IfrsOtherIntangibleAssetsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="himx_IfrsOtherIntangibleAssetsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:label="ifrs-full_IntangibleAssetsOtherThanGoodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IntangibleAssetsOtherThanGoodwill" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill" xlink:label="ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransfersIntangibleAssetsOtherThanGoodwill" xlink:label="ifrs-full_IncreaseDecreaseThroughTransfersIntangibleAssetsOtherThanGoodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IncreaseDecreaseThroughTransfersIntangibleAssetsOtherThanGoodwill" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill" xlink:label="ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:label="ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisposalsOfOtherIntangibleAssets" xlink:label="himx_DisposalsOfOtherIntangibleAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_DisposalsOfOtherIntangibleAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureOtherIntangibleAssetsEstimatedUsefulLivesDetails" xlink:type="extended" xlink:title="99941302 - Disclosure - Other Intangible Assets - Estimated useful lives (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_639101987908576309" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:to="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_639101987908576309" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:label="ifrs-full_TechnologybasedIntangibleAssetsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="ifrs-full_TechnologybasedIntangibleAssetsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComputerSoftwareMember" xlink:label="ifrs-full_ComputerSoftwareMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="ifrs-full_ComputerSoftwareMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherIntangibleAssetsMember" xlink:label="ifrs-full_OtherIntangibleAssetsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="ifrs-full_OtherIntangibleAssetsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_RangeAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_639101987908576309" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain_639101987908576309" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember" xlink:label="ifrs-full_BottomOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_BottomOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="ifrs-full_TopOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_TopOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" xlink:label="ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosurePropertyPlantAndEquipmentDetails" xlink:type="extended" xlink:title="99941401 - Disclosure - Property, Plant and Equipment (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" xlink:label="ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:label="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" xlink:to="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember" xlink:label="ifrs-full_CarryingAmountMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:to="ifrs-full_CarryingAmountMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember" xlink:label="ifrs-full_CarryingAmountMember_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:to="ifrs-full_CarryingAmountMember_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember" xlink:label="ifrs-full_GrossCarryingAmountMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CarryingAmountMember" xlink:to="ifrs-full_GrossCarryingAmountMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:label="ifrs-full_AccumulatedDepreciationAndAmortisationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CarryingAmountMember" xlink:to="ifrs-full_AccumulatedDepreciationAndAmortisationMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LandMember" xlink:label="ifrs-full_LandMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_LandMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_BuildingsImprovementsMember" xlink:label="himx_BuildingsImprovementsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="himx_BuildingsImprovementsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MachineryMember" xlink:label="ifrs-full_MachineryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_MachineryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ResearchAndDevelopmentEquipmentMember" xlink:label="himx_ResearchAndDevelopmentEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="himx_ResearchAndDevelopmentEquipmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OfficeEquipmentMember" xlink:label="ifrs-full_OfficeEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_OfficeEquipmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:label="ifrs-full_OtherPropertyPlantAndEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_OtherPropertyPlantAndEquipmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConstructionInProgressMember" xlink:label="ifrs-full_ConstructionInProgressMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_ConstructionInProgressMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:label="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipment" xlink:label="ifrs-full_PropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="ifrs-full_PropertyPlantAndEquipment" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:label="ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:label="ifrs-full_DepreciationPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="ifrs-full_DepreciationPropertyPlantAndEquipment" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:label="ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:label="ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:label="ifrs-full_DisposalsPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="ifrs-full_DisposalsPropertyPlantAndEquipment" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsCapitalExpendituresIncurredButNotYetPaid" xlink:label="himx_IfrsCapitalExpendituresIncurredButNotYetPaid" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="himx_IfrsCapitalExpendituresIncurredButNotYetPaid" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment" xlink:label="ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosurePropertyPlantAndEquipmentEstimatedUsefulLivesDetails" xlink:type="extended" xlink:title="99941402 - Disclosure - Property, Plant and Equipment - Estimated useful lives (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_RangeAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_RangeDomain" xlink:to="srt_MinimumMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_RangeDomain" xlink:to="srt_MaximumMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BuildingsMember" xlink:label="ifrs-full_BuildingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_BuildingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_BuildingsImprovementsMember" xlink:label="himx_BuildingsImprovementsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="himx_BuildingsImprovementsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MachineryMember" xlink:label="ifrs-full_MachineryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_MachineryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ResearchAndDevelopmentEquipmentMember" xlink:label="himx_ResearchAndDevelopmentEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="himx_ResearchAndDevelopmentEquipmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OfficeEquipmentMember" xlink:label="ifrs-full_OfficeEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_OfficeEquipmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherPropertyPlantAndEquipmentMember" xlink:label="ifrs-full_OtherPropertyPlantAndEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_OtherPropertyPlantAndEquipmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" xlink:label="ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosurePropertyPlantAndEquipmentRightOfUseAssetsDetails" xlink:type="extended" xlink:title="99941403 - Disclosure - Property, Plant and Equipment - Right-of-use assets (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable" xlink:label="ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InitiallyAppliedIFRSsAxis" xlink:label="ifrs-full_InitiallyAppliedIFRSsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable" xlink:to="ifrs-full_InitiallyAppliedIFRSsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InitiallyAppliedIFRSsDomain" xlink:label="ifrs-full_InitiallyAppliedIFRSsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_InitiallyAppliedIFRSsAxis" xlink:to="ifrs-full_InitiallyAppliedIFRSsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InitiallyAppliedIFRSsDomain" xlink:label="ifrs-full_InitiallyAppliedIFRSsDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_InitiallyAppliedIFRSsAxis" xlink:to="ifrs-full_InitiallyAppliedIFRSsDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_Ifrs16Member" xlink:label="himx_Ifrs16Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_InitiallyAppliedIFRSsDomain" xlink:to="himx_Ifrs16Member" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OfficesAndBuildingsMember" xlink:label="himx_OfficesAndBuildingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="himx_OfficesAndBuildingsMember" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems" xlink:label="ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems" xlink:to="ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RightofuseAssets" xlink:label="ifrs-full_RightofuseAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems" xlink:to="ifrs-full_RightofuseAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsToRightofuseAssets" xlink:label="ifrs-full_AdditionsToRightofuseAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems" xlink:to="ifrs-full_AdditionsToRightofuseAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationRightofuseAssets" xlink:label="ifrs-full_DepreciationRightofuseAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems" xlink:to="ifrs-full_DepreciationRightofuseAssets" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureShortTermBorrowingsDetails" xlink:type="extended" xlink:title="99941601 - Disclosure - Short-Term Borrowings (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShorttermBorrowingsMember" xlink:label="ifrs-full_ShorttermBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:to="ifrs-full_ShorttermBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="ifrs-full_RangeAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember" xlink:label="ifrs-full_BottomOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_BottomOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="ifrs-full_TopOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_TopOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnsecuredBankLoansReceived" xlink:label="ifrs-full_UnsecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_UnsecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SecuredBankLoansReceived" xlink:label="ifrs-full_SecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_SecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherBorrowings" xlink:label="ifrs-full_OtherBorrowings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_OtherBorrowings" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsInterestRate" xlink:label="ifrs-full_BorrowingsInterestRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_BorrowingsInterestRate" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureShortTermBorrowingsReconciliationOfLeaseLiabilitiesToCashFlowsArisingFromFinancingActivitiesDetails" xlink:type="extended" xlink:title="99941602 - Disclosure - Short-Term Borrowings - Reconciliation of lease liabilities to cash flows arising from financing activities (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="ifrs-full_BorrowingsByNameAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="ifrs-full_BorrowingsByNameAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain" xlink:label="ifrs-full_BorrowingsByNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_BorrowingsByNameAxis" xlink:to="ifrs-full_BorrowingsByNameDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain" xlink:label="ifrs-full_BorrowingsByNameDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_BorrowingsByNameAxis" xlink:to="ifrs-full_BorrowingsByNameDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_UnsecuredBorrowingsMember" xlink:label="himx_UnsecuredBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_BorrowingsByNameDomain" xlink:to="himx_UnsecuredBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_SecuredBorrowingsMember" xlink:label="himx_SecuredBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_BorrowingsByNameDomain" xlink:to="himx_SecuredBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivities" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities" xlink:label="ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" xlink:label="himx_IncreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_IncreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" xlink:label="himx_DecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_DecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities" xlink:label="ifrs-full_IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="ifrs-full_IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInLiabilitiesArisingFromFinancingActivities" xlink:label="ifrs-full_IncreaseDecreaseInLiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_IncreaseDecreaseInLiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureLongTermBorrowingsDetails" xlink:type="extended" xlink:title="99941701 - Disclosure - Long-Term Borrowings - (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember" xlink:label="ifrs-full_LongtermBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:to="ifrs-full_LongtermBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="ifrs-full_RangeAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember" xlink:label="ifrs-full_BottomOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_BottomOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="ifrs-full_TopOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_TopOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnsecuredBankLoansReceived" xlink:label="ifrs-full_UnsecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_UnsecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentUnsecuredBankLoansReceivedAndCurrentPortionOfNoncurrentUnsecuredBankLoansReceived" xlink:label="ifrs-full_CurrentUnsecuredBankLoansReceivedAndCurrentPortionOfNoncurrentUnsecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_CurrentUnsecuredBankLoansReceivedAndCurrentPortionOfNoncurrentUnsecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentPortionOfNoncurrentUnsecuredBankLoansReceived" xlink:label="ifrs-full_NoncurrentPortionOfNoncurrentUnsecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_NoncurrentPortionOfNoncurrentUnsecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherBorrowings" xlink:label="ifrs-full_OtherBorrowings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_OtherBorrowings" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsInterestRate" xlink:label="ifrs-full_BorrowingsInterestRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_BorrowingsInterestRate" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureLongTermBorrowingsReconciliationOfLeaseLiabilitiesToCashFlowsArisingFromFinancingActivitiesDetails" xlink:type="extended" xlink:title="99941702 - Disclosure - Long-Term Borrowings- Reconciliation of lease liabilities to cash flows arising from financing activities (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember" xlink:label="ifrs-full_LongtermBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:to="ifrs-full_LongtermBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivities" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities" xlink:label="ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" xlink:label="himx_IncreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_IncreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" xlink:label="himx_DecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_DecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities" xlink:label="ifrs-full_IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="ifrs-full_IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_TotalChangeFromFinancingCashFlows" xlink:label="himx_TotalChangeFromFinancingCashFlows" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="himx_TotalChangeFromFinancingCashFlows" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureLongTermBorrowingsLongTermBorrowingsDetails" xlink:type="extended" xlink:title="99941703 - Disclosure - Long-Term Borrowings - Long-Term Borrowings (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember" xlink:label="ifrs-full_LongtermBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:to="ifrs-full_LongtermBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="ifrs-full_BorrowingsByNameAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="ifrs-full_BorrowingsByNameAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain" xlink:label="ifrs-full_BorrowingsByNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_BorrowingsByNameAxis" xlink:to="ifrs-full_BorrowingsByNameDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain" xlink:label="ifrs-full_BorrowingsByNameDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_BorrowingsByNameAxis" xlink:to="ifrs-full_BorrowingsByNameDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ChangHwaBankMember" xlink:label="himx_ChangHwaBankMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_BorrowingsByNameDomain" xlink:to="himx_ChangHwaBankMember" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnsecuredBankLoansReceived" xlink:label="ifrs-full_UnsecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ifrs-full_UnsecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsDebtInstrumentTerm" xlink:label="himx_IfrsDebtInstrumentTerm" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="himx_IfrsDebtInstrumentTerm" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DebtInstrumentCollateralAmounts" xlink:label="himx_DebtInstrumentCollateralAmounts" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="himx_DebtInstrumentCollateralAmounts" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureEmployeeBenefitsDetails" xlink:type="extended" xlink:title="99941801 - Disclosure - Employee benefits (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitPlansAxis" xlink:label="ifrs-full_DefinedBenefitPlansAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_DefinedBenefitPlansAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitPlansDomain" xlink:label="ifrs-full_DefinedBenefitPlansDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_DefinedBenefitPlansAxis" xlink:to="ifrs-full_DefinedBenefitPlansDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitPlansDomain" xlink:label="ifrs-full_DefinedBenefitPlansDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_DefinedBenefitPlansAxis" xlink:to="ifrs-full_DefinedBenefitPlansDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DefinedContributionPlansMember" xlink:label="himx_DefinedContributionPlansMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_DefinedBenefitPlansDomain" xlink:to="himx_DefinedContributionPlansMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans" xlink:label="ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PercentageOfWagesContributionToEmployee" xlink:label="himx_PercentageOfWagesContributionToEmployee" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_PercentageOfWagesContributionToEmployee" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PlanAssetsAtFairValueDepositedInBank" xlink:label="himx_PlanAssetsAtFairValueDepositedInBank" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_PlanAssetsAtFairValueDepositedInBank" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitObligationAtPresentValue" xlink:label="ifrs-full_DefinedBenefitObligationAtPresentValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DefinedBenefitObligationAtPresentValue" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WagesAndSalaries" xlink:label="ifrs-full_WagesAndSalaries" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_WagesAndSalaries" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LabourAndSocialWelfare" xlink:label="himx_LabourAndSocialWelfare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_LabourAndSocialWelfare" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OtherPensionExpenses" xlink:label="himx_OtherPensionExpenses" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_OtherPensionExpenses" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureEmployeeBenefitsExpensesRecognizedInProfitOrLossDetails" xlink:type="extended" xlink:title="99941802 - Disclosure - Employee benefits - Expenses recognized in profit or loss (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis" xlink:label="ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain" xlink:label="ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis" xlink:to="ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain" xlink:label="ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis" xlink:to="ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CashAwardExpensesMember" xlink:label="himx_CashAwardExpensesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain" xlink:to="himx_CashAwardExpensesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRevenueExpense" xlink:label="ifrs-full_InterestRevenueExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_InterestRevenueExpense" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CostOfSales" xlink:label="ifrs-full_CostOfSales" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CostOfSales" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ResearchAndDevelopmentExpense" xlink:label="ifrs-full_ResearchAndDevelopmentExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ResearchAndDevelopmentExpense" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdministrativeExpense" xlink:label="ifrs-full_AdministrativeExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AdministrativeExpense" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SalesAndMarketingExpense" xlink:label="ifrs-full_SalesAndMarketingExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_SalesAndMarketingExpense" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EmployeeBenefitsExpense" xlink:label="ifrs-full_EmployeeBenefitsExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_EmployeeBenefitsExpense" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IncomeTaxExpenseContinuingOperations" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherLongtermBenefits" xlink:label="ifrs-full_OtherLongtermBenefits" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_OtherLongtermBenefits" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EmployeeContributions" xlink:label="ifrs-full_EmployeeContributions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_EmployeeContributions" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureShareBasedCompensationDetails" xlink:type="extended" xlink:title="99941901 - Disclosure - Share-Based Compensation (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareBasedCompensationMember" xlink:label="himx_ShareBasedCompensationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:to="himx_ShareBasedCompensationMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_639101987908607584" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_639101987908607584" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CostOfSalesMember" xlink:label="ifrs-full_CostOfSalesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="ifrs-full_CostOfSalesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsResearchAndDevelopmentExpenseMember" xlink:label="himx_IfrsResearchAndDevelopmentExpenseMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="himx_IfrsResearchAndDevelopmentExpenseMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsGeneralAndAdministrativeExpenseMember" xlink:label="himx_IfrsGeneralAndAdministrativeExpenseMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="himx_IfrsGeneralAndAdministrativeExpenseMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_SalesAndMarketingExpensesMember" xlink:label="himx_SalesAndMarketingExpensesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="himx_SalesAndMarketingExpensesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:label="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_IncomeTaxExpenseContinuingOperations" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureShareBasedCompensationRsusActivityUnderLongTermIncentivePlanDetails" xlink:type="extended" xlink:title="99941902 - Disclosure - Share-Based Compensation - RSUs activity under the long-term incentive plan (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember" xlink:label="ifrs-full_RestrictedShareUnitsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:to="ifrs-full_RestrictedShareUnitsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:label="ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement" xlink:label="ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" xlink:label="ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement2019" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureShareBasedCompensationAllocationOfCompensationExpensesAndRelatedTaxEffectsFromRsusGrantedToEmployeesDetails" xlink:type="extended" xlink:title="99941903 - Disclosure - Share-Based Compensation - Allocation of compensation expenses and related tax effects from the RSUs granted to employees (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember" xlink:label="ifrs-full_RestrictedShareUnitsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:to="ifrs-full_RestrictedShareUnitsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:to="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CostOfSalesMember" xlink:label="ifrs-full_CostOfSalesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="ifrs-full_CostOfSalesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsResearchAndDevelopmentExpenseMember" xlink:label="himx_IfrsResearchAndDevelopmentExpenseMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="himx_IfrsResearchAndDevelopmentExpenseMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsGeneralAndAdministrativeExpenseMember" xlink:label="himx_IfrsGeneralAndAdministrativeExpenseMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="himx_IfrsGeneralAndAdministrativeExpenseMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_SalesAndMarketingExpensesMember" xlink:label="himx_SalesAndMarketingExpensesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="himx_SalesAndMarketingExpensesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:label="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_IncomeTaxExpenseContinuingOperations" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureShareBasedCompensationValuationAssumptionsDetails" xlink:type="extended" xlink:title="99941904 - Disclosure - Share-Based Compensation - Valuation assumptions (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityAxis" xlink:label="himx_IfrsLegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_IfrsLegalEntityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityDomain" xlink:label="himx_IfrsLegalEntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IfrsLegalEntityAxis" xlink:to="himx_IfrsLegalEntityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityDomain" xlink:label="himx_IfrsLegalEntityDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IfrsLegalEntityAxis" xlink:to="himx_IfrsLegalEntityDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CmVisualTechnologyCorpMember" xlink:label="himx_CmVisualTechnologyCorpMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_CmVisualTechnologyCorpMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LiqxtalTechnologyIncMember" xlink:label="himx_LiqxtalTechnologyIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_LiqxtalTechnologyIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanAxis" xlink:label="himx_StockOptionPlanAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_StockOptionPlanAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanDomain" xlink:label="himx_StockOptionPlanDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_StockOptionPlanAxis" xlink:to="himx_StockOptionPlanDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanDomain" xlink:label="himx_StockOptionPlanDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_StockOptionPlanAxis" xlink:to="himx_StockOptionPlanDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOption2021PlanMember" xlink:label="himx_StockOption2021PlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_StockOptionPlanDomain" xlink:to="himx_StockOption2021PlanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOption2023PlanMember" xlink:label="himx_StockOption2023PlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_StockOptionPlanDomain" xlink:to="himx_StockOption2023PlanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOption2025PlanMember" xlink:label="himx_StockOption2025PlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_StockOptionPlanDomain" xlink:to="himx_StockOption2025PlanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareBasedCompensationValuationAssumptionsAndMethodologyAbstract" xlink:label="himx_ShareBasedCompensationValuationAssumptionsAndMethodologyAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_ShareBasedCompensationValuationAssumptionsAndMethodologyAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" xlink:label="ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_ShareBasedCompensationValuationAssumptionsAndMethodologyAbstract" xlink:to="ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xlink:label="ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_ShareBasedCompensationValuationAssumptionsAndMethodologyAbstract" xlink:to="ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DescriptionOfOptionsLifeShareOptionGranted" xlink:label="himx_DescriptionOfOptionsLifeShareOptionGranted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_ShareBasedCompensationValuationAssumptionsAndMethodologyAbstract" xlink:to="himx_DescriptionOfOptionsLifeShareOptionGranted" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:label="ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_ShareBasedCompensationValuationAssumptionsAndMethodologyAbstract" xlink:to="ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_WeightedAverageRemainingContractualLifeOfGranted2019" xlink:label="himx_WeightedAverageRemainingContractualLifeOfGranted2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_ShareBasedCompensationValuationAssumptionsAndMethodologyAbstract" xlink:to="himx_WeightedAverageRemainingContractualLifeOfGranted2019" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureShareBasedCompensationStockOptionActivityDetails" xlink:type="extended" xlink:title="99941905 - Disclosure - Share-Based Compensation - Stock option activity (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityAxis" xlink:label="himx_IfrsLegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_IfrsLegalEntityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityDomain" xlink:label="himx_IfrsLegalEntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IfrsLegalEntityAxis" xlink:to="himx_IfrsLegalEntityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityDomain" xlink:label="himx_IfrsLegalEntityDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IfrsLegalEntityAxis" xlink:to="himx_IfrsLegalEntityDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CmVisualTechnologyCorpMember" xlink:label="himx_CmVisualTechnologyCorpMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_CmVisualTechnologyCorpMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LiqxtalTechnologyIncMember" xlink:label="himx_LiqxtalTechnologyIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_LiqxtalTechnologyIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanAxis" xlink:label="himx_StockOptionPlanAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_StockOptionPlanAxis" priority="2" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanDomain" xlink:label="himx_StockOptionPlanDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_StockOptionPlanAxis" xlink:to="himx_StockOptionPlanDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanDomain" xlink:label="himx_StockOptionPlanDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_StockOptionPlanAxis" xlink:to="himx_StockOptionPlanDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOption2021PlanMember" xlink:label="himx_StockOption2021PlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_StockOptionPlanDomain" xlink:to="himx_StockOption2021PlanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOption2025PlanMember" xlink:label="himx_StockOption2025PlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_StockOptionPlanDomain" xlink:to="himx_StockOption2025PlanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOutstandingShareOptions" xlink:label="ifrs-full_NumberOfOutstandingShareOptions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfOutstandingShareOptions" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:label="ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement" xlink:label="ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:label="ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NumberOfShareOptionsDecreaseEffectOfCapitalReductionShareBasedPaymentArrangement" xlink:label="himx_NumberOfShareOptionsDecreaseEffectOfCapitalReductionShareBasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_NumberOfShareOptionsDecreaseEffectOfCapitalReductionShareBasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_WeightedAverageExercisePriceOfShareOptionsForEffectOfCapitalReductionInShareBasedPaymentArrangement" xlink:label="himx_WeightedAverageExercisePriceOfShareOptionsForEffectOfCapitalReductionInShareBasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_WeightedAverageExercisePriceOfShareOptionsForEffectOfCapitalReductionInShareBasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_WeightedAverageRemainingContractualLifeOfGranted2019" xlink:label="himx_WeightedAverageRemainingContractualLifeOfGranted2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_WeightedAverageRemainingContractualLifeOfGranted2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019" xlink:label="ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_WeightedAverageRemainingContractualLifeOfExercisableShareOptions2019" xlink:label="himx_WeightedAverageRemainingContractualLifeOfExercisableShareOptions2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_WeightedAverageRemainingContractualLifeOfExercisableShareOptions2019" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureShareBasedCompensationAdditionalInformationDetails" xlink:type="extended" xlink:title="99941906 - Disclosure - Share-Based Compensation - Additional information (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanAxis" xlink:label="himx_StockOptionPlanAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_StockOptionPlanAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanDomain" xlink:label="himx_StockOptionPlanDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_StockOptionPlanAxis" xlink:to="himx_StockOptionPlanDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOptionPlanDomain" xlink:label="himx_StockOptionPlanDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_StockOptionPlanAxis" xlink:to="himx_StockOptionPlanDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOption2016PlanMember" xlink:label="himx_StockOption2016PlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_StockOptionPlanDomain" xlink:to="himx_StockOption2016PlanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOption2021PlanMember" xlink:label="himx_StockOption2021PlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_StockOptionPlanDomain" xlink:to="himx_StockOption2021PlanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOption2023PlanMember" xlink:label="himx_StockOption2023PlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_StockOptionPlanDomain" xlink:to="himx_StockOption2023PlanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_StockOption2025PlanMember" xlink:label="himx_StockOption2025PlanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_StockOptionPlanDomain" xlink:to="himx_StockOption2025PlanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityAxis" xlink:label="himx_IfrsLegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_IfrsLegalEntityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityDomain" xlink:label="himx_IfrsLegalEntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IfrsLegalEntityAxis" xlink:to="himx_IfrsLegalEntityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsLegalEntityDomain" xlink:label="himx_IfrsLegalEntityDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IfrsLegalEntityAxis" xlink:to="himx_IfrsLegalEntityDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ImagingTaiwanMember" xlink:label="himx_ImagingTaiwanMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_ImagingTaiwanMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_HimaxImagingMember" xlink:label="himx_HimaxImagingMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_HimaxImagingMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CmVisualTechnologyCorpMember" xlink:label="himx_CmVisualTechnologyCorpMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_CmVisualTechnologyCorpMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LiqxtalTechnologyIncMember" xlink:label="himx_LiqxtalTechnologyIncMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsLegalEntityDomain" xlink:to="himx_LiqxtalTechnologyIncMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsIssuerEquityTypeAxis" xlink:label="himx_IfrsIssuerEquityTypeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_IfrsIssuerEquityTypeAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsIssuerEquityTypeDomain" xlink:label="himx_IfrsIssuerEquityTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IfrsIssuerEquityTypeAxis" xlink:to="himx_IfrsIssuerEquityTypeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsIssuerEquityTypeDomain" xlink:label="himx_IfrsIssuerEquityTypeDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IfrsIssuerEquityTypeAxis" xlink:to="himx_IfrsIssuerEquityTypeDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ROCCentralGovernmentMember" xlink:label="himx_ROCCentralGovernmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IfrsIssuerEquityTypeDomain" xlink:to="himx_ROCCentralGovernmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStockOptionVestingAxis" xlink:label="himx_IfrsStockOptionVestingAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_IfrsStockOptionVestingAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStockOptionVestingDomain" xlink:label="himx_IfrsStockOptionVestingDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IfrsStockOptionVestingAxis" xlink:to="himx_IfrsStockOptionVestingDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStockOptionVestingDomain" xlink:label="himx_IfrsStockOptionVestingDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IfrsStockOptionVestingAxis" xlink:to="himx_IfrsStockOptionVestingDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OneAndHalfYearsAfterGrantDateMember" xlink:label="himx_OneAndHalfYearsAfterGrantDateMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IfrsStockOptionVestingDomain" xlink:to="himx_OneAndHalfYearsAfterGrantDateMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ThreeYearsAfterGrantDateMember" xlink:label="himx_ThreeYearsAfterGrantDateMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStockOptionVestingDomain" xlink:to="himx_ThreeYearsAfterGrantDateMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsVestingAxis" xlink:label="himx_IfrsVestingAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="himx_IfrsVestingAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsVestingDomain" xlink:label="himx_IfrsVestingDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IfrsVestingAxis" xlink:to="himx_IfrsVestingDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsVestingDomain" xlink:label="himx_IfrsVestingDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IfrsVestingAxis" xlink:to="himx_IfrsVestingDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsShareBasedPaymentArrangementTrancheOneMember" xlink:label="himx_IfrsShareBasedPaymentArrangementTrancheOneMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IfrsVestingDomain" xlink:to="himx_IfrsShareBasedPaymentArrangementTrancheOneMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsShareBasedPaymentArrangementTrancheTwoMember" xlink:label="himx_IfrsShareBasedPaymentArrangementTrancheTwoMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsVestingDomain" xlink:to="himx_IfrsShareBasedPaymentArrangementTrancheTwoMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsShareBasedPaymentArrangementTrancheThreeMember" xlink:label="himx_IfrsShareBasedPaymentArrangementTrancheThreeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsVestingDomain" xlink:to="himx_IfrsShareBasedPaymentArrangementTrancheThreeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="6" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember" xlink:label="ifrs-full_RestrictedShareUnitsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:to="ifrs-full_RestrictedShareUnitsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="7" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" xlink:to="ifrs-full_RangeAxis" priority="2" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember" xlink:label="ifrs-full_BottomOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_BottomOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember" xlink:label="ifrs-full_TopOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_TopOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:label="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareOptionsContractualLife" xlink:label="himx_ShareOptionsContractualLife" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_ShareOptionsContractualLife" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareOptionsVestingPeriod" xlink:label="himx_ShareOptionsVestingPeriod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_ShareOptionsVestingPeriod" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareBasedCompensationVestingRightsPercentages" xlink:label="himx_ShareBasedCompensationVestingRightsPercentages" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_ShareBasedCompensationVestingRightsPercentages" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareBasedCompensationRiskFreeInterestRateExpectedTerm" xlink:label="himx_ShareBasedCompensationRiskFreeInterestRateExpectedTerm" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_ShareBasedCompensationRiskFreeInterestRateExpectedTerm" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareBasedCompensationNoOfSharesAuthorized" xlink:label="himx_ShareBasedCompensationNoOfSharesAuthorized" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_ShareBasedCompensationNoOfSharesAuthorized" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:label="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" xlink:label="ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PercentageOfRestrictedStockUnitsGrantVested" xlink:label="himx_PercentageOfRestrictedStockUnitsGrantVested" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_PercentageOfRestrictedStockUnitsGrantVested" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PercentageOfVestedSettledByOrdinarySharesOne" xlink:label="himx_PercentageOfVestedSettledByOrdinarySharesOne" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_PercentageOfVestedSettledByOrdinarySharesOne" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PercentageOfVestedSettledByOrdinarySharesTwo" xlink:label="himx_PercentageOfVestedSettledByOrdinarySharesTwo" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_PercentageOfVestedSettledByOrdinarySharesTwo" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PercentageOfVestedSettledByOrdinarySharesThree" xlink:label="himx_PercentageOfVestedSettledByOrdinarySharesThree" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_PercentageOfVestedSettledByOrdinarySharesThree" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EstimatedFairValueMarketPriceOfDS" xlink:label="himx_EstimatedFairValueMarketPriceOfDS" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_EstimatedFairValueMarketPriceOfDS" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RestrictedStockUnitsSettleByShares" xlink:label="himx_RestrictedStockUnitsSettleByShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_RestrictedStockUnitsSettleByShares" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:label="ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_MaximumNumberOfShareOptionsAuthorizedForGrantInShareBasedPaymentArrangement" xlink:label="himx_MaximumNumberOfShareOptionsAuthorizedForGrantInShareBasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_MaximumNumberOfShareOptionsAuthorizedForGrantInShareBasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExercisePriceShareOptionsGranted2019" xlink:label="ifrs-full_ExercisePriceShareOptionsGranted2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_ExercisePriceShareOptionsGranted2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement" xlink:label="ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019" xlink:label="ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_WeightedAverageRemainingContractualLifeOfGranted2019" xlink:label="himx_WeightedAverageRemainingContractualLifeOfGranted2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_WeightedAverageRemainingContractualLifeOfGranted2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019" xlink:label="ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EmployeeServiceShareBasedCompensationUnvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="himx_EmployeeServiceShareBasedCompensationUnvestedAwardsTotalCompensationCostNotYetRecognized" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="24" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_EmployeeServiceShareBasedCompensationUnvestedAwardsTotalCompensationCostNotYetRecognized" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RestrictedStockUnitsSettledByCash" xlink:label="himx_RestrictedStockUnitsSettledByCash" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="25" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_RestrictedStockUnitsSettledByCash" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareBasedCompensationArrangementVestingRightsPercentage" xlink:label="himx_ShareBasedCompensationArrangementVestingRightsPercentage" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="26" xlink:from="himx_DisclosureOfShareBasedPaymentArrangementsExplanatoryLineItems" xlink:to="himx_ShareBasedCompensationArrangementVestingRightsPercentage" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureEquityAdditionalPaidInCapitalDetails" xlink:type="extended" xlink:title="99942001 - Disclosure - Equity - Additional Paid-in Capital (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TreasurySharesMember" xlink:label="ifrs-full_TreasurySharesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_TreasurySharesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareOfChangesInEquitiesOfAssociatesAndSubsidiariesMember" xlink:label="himx_ShareOfChangesInEquitiesOfAssociatesAndSubsidiariesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="himx_ShareOfChangesInEquitiesOfAssociatesAndSubsidiariesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfOrdinarySharesAxis" xlink:label="ifrs-full_ClassesOfOrdinarySharesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfOrdinarySharesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfOrdinarySharesDomain" xlink:label="ifrs-full_ClassesOfOrdinarySharesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfOrdinarySharesAxis" xlink:to="ifrs-full_ClassesOfOrdinarySharesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfOrdinarySharesDomain" xlink:label="ifrs-full_ClassesOfOrdinarySharesDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfOrdinarySharesAxis" xlink:to="ifrs-full_ClassesOfOrdinarySharesDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OrdinaryShareMember" xlink:label="himx_OrdinaryShareMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfOrdinarySharesDomain" xlink:to="himx_OrdinaryShareMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:label="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:to="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShareBasedCompensationMember" xlink:label="himx_ShareBasedCompensationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:to="himx_ShareBasedCompensationMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AdditionalPaidInCapitalIncreaseDecreaseThroughOrdinaryShares" xlink:label="himx_AdditionalPaidInCapitalIncreaseDecreaseThroughOrdinaryShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_AdditionalPaidInCapitalIncreaseDecreaseThroughOrdinaryShares" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SaleOrIssueOfTreasuryShares" xlink:label="ifrs-full_SaleOrIssueOfTreasuryShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_SaleOrIssueOfTreasuryShares" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AdditionalPaidInCapitalIncreaseDecreaseThroughShareBasedCompensation" xlink:label="himx_AdditionalPaidInCapitalIncreaseDecreaseThroughShareBasedCompensation" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_AdditionalPaidInCapitalIncreaseDecreaseThroughShareBasedCompensation" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughChangeInEquityOfSubsidiaries" xlink:label="ifrs-full_IncreaseDecreaseThroughChangeInEquityOfSubsidiaries" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IncreaseDecreaseThroughChangeInEquityOfSubsidiaries" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionalPaidinCapital" xlink:label="ifrs-full_AdditionalPaidinCapital" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AdditionalPaidinCapital" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureEquityAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended" xlink:title="99942002 - Disclosure - Equity - Accumulated other comprehensive income (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CurrencyTranslationAxis" xlink:label="himx_CurrencyTranslationAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="himx_CurrencyTranslationAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CurrencyTranslationDomain" xlink:label="himx_CurrencyTranslationDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_CurrencyTranslationAxis" xlink:to="himx_CurrencyTranslationDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CurrencyTranslationDomain" xlink:label="himx_CurrencyTranslationDomain_639101987908762955" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_CurrencyTranslationAxis" xlink:to="himx_CurrencyTranslationDomain_639101987908762955" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ForeignCurrencyTranslationMember" xlink:label="himx_ForeignCurrencyTranslationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_CurrencyTranslationDomain" xlink:to="himx_ForeignCurrencyTranslationMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitPlansAxis" xlink:label="ifrs-full_DefinedBenefitPlansAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_DefinedBenefitPlansAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitPlansDomain" xlink:label="ifrs-full_DefinedBenefitPlansDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_DefinedBenefitPlansAxis" xlink:to="ifrs-full_DefinedBenefitPlansDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitPlansDomain" xlink:label="ifrs-full_DefinedBenefitPlansDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_DefinedBenefitPlansAxis" xlink:to="ifrs-full_DefinedBenefitPlansDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DefinedBenefitPlansThatShareRisksBetweenEntitiesUnderCommonControlMember" xlink:label="ifrs-full_DefinedBenefitPlansThatShareRisksBetweenEntitiesUnderCommonControlMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_DefinedBenefitPlansDomain" xlink:to="ifrs-full_DefinedBenefitPlansThatShareRisksBetweenEntitiesUnderCommonControlMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedOtherComprehensiveIncomeMember" xlink:label="ifrs-full_AccumulatedOtherComprehensiveIncomeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_AccumulatedOtherComprehensiveIncomeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FairValueMeasurementAndAdjustmentAxis" xlink:label="himx_FairValueMeasurementAndAdjustmentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="himx_IfrsStatementTable" xlink:to="himx_FairValueMeasurementAndAdjustmentAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FairValueMeasurementAndAdjustmentDomain" xlink:label="himx_FairValueMeasurementAndAdjustmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_FairValueMeasurementAndAdjustmentAxis" xlink:to="himx_FairValueMeasurementAndAdjustmentDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FairValueMeasurementAndAdjustmentDomain" xlink:label="himx_FairValueMeasurementAndAdjustmentDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_FairValueMeasurementAndAdjustmentAxis" xlink:to="himx_FairValueMeasurementAndAdjustmentDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_UnrealizedGainLossesOnSecuritiesMember" xlink:label="himx_UnrealizedGainLossesOnSecuritiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_FairValueMeasurementAndAdjustmentDomain" xlink:to="himx_UnrealizedGainLossesOnSecuritiesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedOtherComprehensiveIncome" xlink:label="ifrs-full_AccumulatedOtherComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AccumulatedOtherComprehensiveIncome" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ExchangeDifferenceOnTranslationOfForeignOperations" xlink:label="himx_ExchangeDifferenceOnTranslationOfForeignOperations" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_ExchangeDifferenceOnTranslationOfForeignOperations" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ChangesInFairValueOfFinancialAssets" xlink:label="himx_ChangesInFairValueOfFinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_ChangesInFairValueOfFinancialAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RemeasurementOfDefinedBenefitPensionPlan" xlink:label="himx_RemeasurementOfDefinedBenefitPensionPlan" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_RemeasurementOfDefinedBenefitPensionPlan" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureEquityNoncontrollingInterestDetails" xlink:type="extended" xlink:title="99942003 - Disclosure - Equity - Noncontrolling interest (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncontrollingInterestsMember" xlink:label="ifrs-full_NoncontrollingInterestsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_NoncontrollingInterestsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity" xlink:label="ifrs-full_Equity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_Equity" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EquityAttriButableToNonControllingInterestAbstract" xlink:label="himx_EquityAttriButableToNonControllingInterestAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_EquityAttriButableToNonControllingInterestAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:label="ifrs-full_ProfitLossAttributableToNoncontrollingInterests" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_EquityAttriButableToNonControllingInterestAbstract" xlink:to="ifrs-full_ProfitLossAttributableToNoncontrollingInterests" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RemeasurementOfDefinedBenefitPensionPlan" xlink:label="himx_RemeasurementOfDefinedBenefitPensionPlan" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_EquityAttriButableToNonControllingInterestAbstract" xlink:to="himx_RemeasurementOfDefinedBenefitPensionPlan" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:label="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_EquityAttriButableToNonControllingInterestAbstract" xlink:to="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NewSharesIssuedBySubsidiary" xlink:label="himx_NewSharesIssuedBySubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_EquityAttriButableToNonControllingInterestAbstract" xlink:to="himx_NewSharesIssuedBySubsidiary" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests" xlink:label="ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_EquityAttriButableToNonControllingInterestAbstract" xlink:to="ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AcquiredControllingPowerFromNoncontrollingInterest" xlink:label="himx_AcquiredControllingPowerFromNoncontrollingInterest" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_EquityAttriButableToNonControllingInterestAbstract" xlink:to="himx_AcquiredControllingPowerFromNoncontrollingInterest" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PurchaseOfSubsidiarySharesFromNonControllingInterest" xlink:label="himx_PurchaseOfSubsidiarySharesFromNonControllingInterest" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_EquityAttriButableToNonControllingInterestAbstract" xlink:to="himx_PurchaseOfSubsidiarySharesFromNonControllingInterest" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ExchangeDifferenceOnTranslationOfForeignOperations" xlink:label="himx_ExchangeDifferenceOnTranslationOfForeignOperations" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_EquityAttriButableToNonControllingInterestAbstract" xlink:to="himx_ExchangeDifferenceOnTranslationOfForeignOperations" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureEquityAdditionalInformationDetails" xlink:type="extended" xlink:title="99942004 - Disclosure - Equity - Additional Information (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember" xlink:label="ifrs-full_IssuedCapitalMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_IssuedCapitalMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TreasurySharesMember" xlink:label="ifrs-full_TreasurySharesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_TreasurySharesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsClassOfStockAxis" xlink:label="himx_IfrsClassOfStockAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="himx_IfrsClassOfStockAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsClassOfStockDomain" xlink:label="himx_IfrsClassOfStockDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IfrsClassOfStockAxis" xlink:to="himx_IfrsClassOfStockDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsClassOfStockDomain" xlink:label="himx_IfrsClassOfStockDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IfrsClassOfStockAxis" xlink:to="himx_IfrsClassOfStockDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AmericanDepositaryReceiptMember" xlink:label="himx_AmericanDepositaryReceiptMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IfrsClassOfStockDomain" xlink:to="himx_AmericanDepositaryReceiptMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ParValuePerShare" xlink:label="ifrs-full_ParValuePerShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ParValuePerShare" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesAuthorised" xlink:label="ifrs-full_NumberOfSharesAuthorised" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_NumberOfSharesAuthorised" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1" xlink:label="srt_StockRepurchaseProgramAuthorizedAmount1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="srt_StockRepurchaseProgramAuthorizedAmount1" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchaseOfTreasuryShares" xlink:label="ifrs-full_PurchaseOfTreasuryShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_PurchaseOfTreasuryShares" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsTreasuryStockSharesAcquired" xlink:label="himx_IfrsTreasuryStockSharesAcquired" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsTreasuryStockSharesAcquired" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsSharesAcquiredAverageCostPerShare" xlink:label="himx_IfrsSharesAcquiredAverageCostPerShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsSharesAcquiredAverageCostPerShare" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding" xlink:label="ifrs-full_NumberOfSharesOutstanding" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_NumberOfSharesOutstanding" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssued" xlink:label="ifrs-full_NumberOfSharesIssued" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_NumberOfSharesIssued" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AccumulatedLegalAndSpecialReserve" xlink:label="himx_AccumulatedLegalAndSpecialReserve" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_AccumulatedLegalAndSpecialReserve" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInAssociate" xlink:label="ifrs-full_ProportionOfOwnershipInterestInAssociate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProportionOfOwnershipInterestInAssociate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PercentageOfAnnualNetIncomeSetAsideAsLegalReserve" xlink:label="himx_PercentageOfAnnualNetIncomeSetAsideAsLegalReserve" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_PercentageOfAnnualNetIncomeSetAsideAsLegalReserve" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendPayables" xlink:label="ifrs-full_DividendPayables" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DividendPayables" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DividendPayablesPerShare" xlink:label="himx_DividendPayablesPerShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_DividendPayablesPerShare" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureIncomeTaxesChangesInDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="extended" xlink:title="99942105 - Disclosure - Income Taxes - Changes in deferred tax assets and liabilities (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:to="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:to="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_InventoryMember" xlink:label="himx_InventoryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_InventoryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_TaxCreditCarryforwardsMember" xlink:label="himx_TaxCreditCarryforwardsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_TaxCreditCarryforwardsMember" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AccruedCompensatedAbsencesMember" xlink:label="himx_AccruedCompensatedAbsencesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_AccruedCompensatedAbsencesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AllowanceForSalesDiscountsMember" xlink:label="himx_AllowanceForSalesDiscountsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_AllowanceForSalesDiscountsMember" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnusedTaxLossesMember" xlink:label="ifrs-full_UnusedTaxLossesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="ifrs-full_UnusedTaxLossesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_Depreciation1Member" xlink:label="himx_Depreciation1Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_Depreciation1Member" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnrealisedForeignExchangeGainsLossesMember" xlink:label="ifrs-full_UnrealisedForeignExchangeGainsLossesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="ifrs-full_UnrealisedForeignExchangeGainsLossesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RemeasurementOfDefinedBenefitPlansMember" xlink:label="himx_RemeasurementOfDefinedBenefitPlansMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_RemeasurementOfDefinedBenefitPlansMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IntangibleAssetsMember" xlink:label="himx_IntangibleAssetsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_IntangibleAssetsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherTemporaryDifferencesMember" xlink:label="ifrs-full_OtherTemporaryDifferencesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="ifrs-full_OtherTemporaryDifferencesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxLiabilityAsset" xlink:label="ifrs-full_DeferredTaxLiabilityAsset" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DeferredTaxLiabilityAsset" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:label="ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome" xlink:label="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureIncomeTaxesUnrecognizedDeferredTaxAssetsDetails" xlink:type="extended" xlink:title="99942106 - Disclosure - Income Taxes - Unrecognized Deferred Tax Assets (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:to="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:to="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnusedTaxCreditsMember" xlink:label="ifrs-full_UnusedTaxCreditsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="ifrs-full_UnusedTaxCreditsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OperatingLossCarryforwardStatutoryTaxMember" xlink:label="himx_OperatingLossCarryforwardStatutoryTaxMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_OperatingLossCarryforwardStatutoryTaxMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_UndistributedEarningsTaxMember" xlink:label="himx_UndistributedEarningsTaxMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_UndistributedEarningsTaxMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherTemporaryDifferencesMember" xlink:label="ifrs-full_OtherTemporaryDifferencesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="ifrs-full_OtherTemporaryDifferencesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_TotalMember" xlink:label="himx_TotalMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:to="himx_TotalMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xlink:label="ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureIncomeTaxesExpirationPeriodForUnrecognizedDeferredTaxAssetsDetails" xlink:type="extended" xlink:title="99942107 - Disclosure - Income Taxes- Expiration period for unrecognized deferred tax assets (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="ifrs-full_GeographicalAreasAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_GeographicalAreasAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="ifrs-full_GeographicalAreasDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_GeographicalAreasAxis" xlink:to="ifrs-full_GeographicalAreasDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="ifrs-full_GeographicalAreasDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_GeographicalAreasAxis" xlink:to="ifrs-full_GeographicalAreasDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_TW" xlink:label="country_TW" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_TW" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK" xlink:label="country_HK" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_HK" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US" xlink:label="country_US" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_US" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis" xlink:label="ifrs-full_MaturityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_MaturityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain" xlink:label="ifrs-full_MaturityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_MaturityAxis" xlink:to="ifrs-full_MaturityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain" xlink:label="ifrs-full_MaturityDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_MaturityAxis" xlink:to="ifrs-full_MaturityDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ExpirationYear2026To2030Member" xlink:label="himx_ExpirationYear2026To2030Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_MaturityDomain" xlink:to="himx_ExpirationYear2026To2030Member" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ExpirationYear2031To2035Member" xlink:label="himx_ExpirationYear2031To2035Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_MaturityDomain" xlink:to="himx_ExpirationYear2031To2035Member" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_Expiration2026ToIndefinitelyMember" xlink:label="himx_Expiration2026ToIndefinitelyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_MaturityDomain" xlink:to="himx_Expiration2026ToIndefinitelyMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xlink:label="ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:label="ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfExpiryDateOfTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCredits" xlink:label="ifrs-full_DescriptionOfExpiryDateOfTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCredits" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DescriptionOfExpiryDateOfTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCredits" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureIncomeTaxesAdditionalInformationDetails" xlink:type="extended" xlink:title="99942108 - Disclosure - Income Taxes - Additional Information (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis" xlink:label="ifrs-full_RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_RangeAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain" xlink:label="ifrs-full_RangeDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_RangeAxis" xlink:to="ifrs-full_RangeDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember" xlink:label="ifrs-full_BottomOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_RangeDomain" xlink:to="ifrs-full_BottomOfRangeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfExpiryDateOfTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCredits" xlink:label="ifrs-full_DescriptionOfExpiryDateOfTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCredits" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DescriptionOfExpiryDateOfTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCredits" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_UndistributedEarningOfForeignSubsidiaries" xlink:label="himx_UndistributedEarningOfForeignSubsidiaries" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_UndistributedEarningOfForeignSubsidiaries" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TaxRateEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" xlink:label="ifrs-full_TaxRateEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_TaxRateEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsFinancialAssetsDetails" xlink:type="extended" xlink:title="99942201 - Disclosure - Financial Instruments - Financial assets (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis" xlink:label="ifrs-full_ClassesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfFinancialAssetsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="ifrs-full_ClassesOfFinancialAssetsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="ifrs-full_ClassesOfFinancialAssetsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="ifrs-full_ClassesOfFinancialAssetsDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="ifrs-full_ClassesOfFinancialAssetsDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CashAndCashEquivalentMember" xlink:label="himx_CashAndCashEquivalentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="himx_CashAndCashEquivalentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCostMember" xlink:label="ifrs-full_FinancialAssetsAtAmortisedCostMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="ifrs-full_FinancialAssetsAtAmortisedCostMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AccountsReceivableAndOtherReceivablesMember" xlink:label="himx_AccountsReceivableAndOtherReceivablesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="himx_AccountsReceivableAndOtherReceivablesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RestrictedDepositMember" xlink:label="himx_RestrictedDepositMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="himx_RestrictedDepositMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RefundableDepositsMember" xlink:label="himx_RefundableDepositsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="himx_RefundableDepositsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:label="ifrs-full_CategoriesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CategoriesOfFinancialAssetsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:to="ifrs-full_CategoriesOfFinancialAssetsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:to="ifrs-full_CategoriesOfFinancialAssetsDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:label="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:to="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember" xlink:label="himx_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:to="himx_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FinancialAssetAtAmortisedCostCategoryMember" xlink:label="himx_FinancialAssetAtAmortisedCostCategoryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:to="himx_FinancialAssetAtAmortisedCostCategoryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FinancialAssetsMeasuredAtAmortizedCostAbstract" xlink:label="himx_FinancialAssetsMeasuredAtAmortizedCostAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_FinancialAssetsMeasuredAtAmortizedCostAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets" xlink:label="ifrs-full_FinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_FinancialAssetsMeasuredAtAmortizedCostAbstract" xlink:to="ifrs-full_FinancialAssets" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsFinancialLiabilitiesDetails" xlink:type="extended" xlink:title="99942202 - Disclosure - Financial Instruments - Financial liabilities (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" xlink:label="ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:to="ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:label="ifrs-full_ClassesOfFinancialLiabilitiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfFinancialLiabilitiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_ClassesOfFinancialLiabilitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:to="ifrs-full_ClassesOfFinancialLiabilitiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_ClassesOfFinancialLiabilitiesDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:to="ifrs-full_ClassesOfFinancialLiabilitiesDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShortTermSecuredBorrowingsMember" xlink:label="himx_ShortTermSecuredBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:to="himx_ShortTermSecuredBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ShortTermUnsecuredBorrowingsMember" xlink:label="himx_ShortTermUnsecuredBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:to="himx_ShortTermUnsecuredBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AccountsPayablesAndOtherPayablesMember" xlink:label="himx_AccountsPayablesAndOtherPayablesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:to="himx_AccountsPayablesAndOtherPayablesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember" xlink:label="ifrs-full_LongtermBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:to="ifrs-full_LongtermBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesMember" xlink:label="ifrs-full_LeaseLiabilitiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:to="ifrs-full_LeaseLiabilitiesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_GuaranteeDepositsMember" xlink:label="himx_GuaranteeDepositsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:to="himx_GuaranteeDepositsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAbstract" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilities" xlink:label="ifrs-full_FinancialLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesAbstract" xlink:to="ifrs-full_FinancialLiabilities" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsLiquidityRiskDetails" xlink:type="extended" xlink:title="99942203 - Disclosure - Financial Instruments - Liquidity risk (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ContractualCashFlowsMember" xlink:label="himx_ContractualCashFlowsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:to="himx_ContractualCashFlowsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis" xlink:label="ifrs-full_MaturityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_MaturityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain" xlink:label="ifrs-full_MaturityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_MaturityAxis" xlink:to="ifrs-full_MaturityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain" xlink:label="ifrs-full_MaturityDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_MaturityAxis" xlink:to="ifrs-full_MaturityDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NotLaterThanSixMonthsMember" xlink:label="himx_NotLaterThanSixMonthsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_MaturityDomain" xlink:to="himx_NotLaterThanSixMonthsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanSixMonthsAndNotLaterThanOneYearMember" xlink:label="ifrs-full_LaterThanSixMonthsAndNotLaterThanOneYearMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_MaturityDomain" xlink:to="ifrs-full_LaterThanSixMonthsAndNotLaterThanOneYearMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:label="ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_MaturityDomain" xlink:to="ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanTwoYearsAndNotLaterThanFiveYearsMember" xlink:label="ifrs-full_LaterThanTwoYearsAndNotLaterThanFiveYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_MaturityDomain" xlink:to="ifrs-full_LaterThanTwoYearsAndNotLaterThanFiveYearsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="ifrs-full_LaterThanFiveYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_MaturityDomain" xlink:to="ifrs-full_LaterThanFiveYearsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="ifrs-full_BorrowingsByNameAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_BorrowingsByNameAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain" xlink:label="ifrs-full_BorrowingsByNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_BorrowingsByNameAxis" xlink:to="ifrs-full_BorrowingsByNameDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain" xlink:label="ifrs-full_BorrowingsByNameDomain_639101987908927397" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_BorrowingsByNameAxis" xlink:to="ifrs-full_BorrowingsByNameDomain_639101987908927397" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_UnsecuredBorrowingsMember" xlink:label="himx_UnsecuredBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_BorrowingsByNameDomain" xlink:to="himx_UnsecuredBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NonDerivativeFinancialLiabilitiesAbstract" xlink:label="himx_NonDerivativeFinancialLiabilitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_NonDerivativeFinancialLiabilitiesAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CurrentUnsecuredBankLoansReceived" xlink:label="himx_CurrentUnsecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_NonDerivativeFinancialLiabilitiesAbstract" xlink:to="himx_CurrentUnsecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentSecuredBankLoansReceivedAndCurrentPortionOfNoncurrentSecuredBankLoansReceived" xlink:label="ifrs-full_CurrentSecuredBankLoansReceivedAndCurrentPortionOfNoncurrentSecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_NonDerivativeFinancialLiabilitiesAbstract" xlink:to="ifrs-full_CurrentSecuredBankLoansReceivedAndCurrentPortionOfNoncurrentSecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LongTermBorrowingsCurrentAndNonCurrent" xlink:label="himx_LongTermBorrowingsCurrentAndNonCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_NonDerivativeFinancialLiabilitiesAbstract" xlink:to="himx_LongTermBorrowingsCurrentAndNonCurrent" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilities" xlink:label="ifrs-full_LeaseLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_NonDerivativeFinancialLiabilitiesAbstract" xlink:to="ifrs-full_LeaseLiabilities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_GuaranteeDeposits" xlink:label="himx_GuaranteeDeposits" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_NonDerivativeFinancialLiabilitiesAbstract" xlink:to="himx_GuaranteeDeposits" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows" xlink:label="ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_NonDerivativeFinancialLiabilitiesAbstract" xlink:to="ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsCurrencyRiskDetails" xlink:type="extended" xlink:title="99942204 - Disclosure - Financial Instruments - Currency risk (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="ifrs-full_TypesOfRisksAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_TypesOfRisksAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="ifrs-full_TypesOfRisksDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TypesOfRisksAxis" xlink:to="ifrs-full_TypesOfRisksDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="ifrs-full_TypesOfRisksDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TypesOfRisksAxis" xlink:to="ifrs-full_TypesOfRisksDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NTDMember" xlink:label="himx_NTDMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TypesOfRisksDomain" xlink:to="himx_NTDMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CNYMember" xlink:label="himx_CNYMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_TypesOfRisksDomain" xlink:to="himx_CNYMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_JpyMember" xlink:label="himx_JpyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_TypesOfRisksDomain" xlink:to="himx_JpyMember" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:label="ifrs-full_CategoriesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CategoriesOfFinancialAssetsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:to="ifrs-full_CategoriesOfFinancialAssetsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:to="ifrs-full_CategoriesOfFinancialAssetsDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FinancialAssetMember" xlink:label="himx_FinancialAssetMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:to="himx_FinancialAssetMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:to="ifrs-full_CategoriesOfFinancialLiabilitiesDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FinancialLiabilitiesMember" xlink:label="himx_FinancialLiabilitiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:to="himx_FinancialLiabilitiesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetForeignExchangeGain" xlink:label="ifrs-full_NetForeignExchangeGain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_NetForeignExchangeGain" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AverageForeignExchangeRate" xlink:label="ifrs-full_AverageForeignExchangeRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AverageForeignExchangeRate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_FunctionalCurrency" xlink:label="himx_FunctionalCurrency" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_FunctionalCurrency" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsFinancialInstrumentsMeasuredAtFairValueDetails" xlink:type="extended" xlink:title="99942205 - Disclosure - Financial Instruments - Financial instruments measured at fair value (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis" xlink:label="ifrs-full_ClassesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ClassesOfFinancialAssetsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="ifrs-full_ClassesOfFinancialAssetsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="ifrs-full_ClassesOfFinancialAssetsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain" xlink:label="ifrs-full_ClassesOfFinancialAssetsDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="ifrs-full_ClassesOfFinancialAssetsDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsMoneyMarketFundsMember" xlink:label="himx_IfrsMoneyMarketFundsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="himx_IfrsMoneyMarketFundsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EquitySecuritiesUnlistedCompanyMember" xlink:label="himx_EquitySecuritiesUnlistedCompanyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="himx_EquitySecuritiesUnlistedCompanyMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_EquitySecuritiesListedCompanyMember" xlink:label="himx_EquitySecuritiesListedCompanyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="himx_EquitySecuritiesListedCompanyMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WarrantsMember" xlink:label="ifrs-full_WarrantsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="ifrs-full_WarrantsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:label="ifrs-full_CategoriesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CategoriesOfFinancialAssetsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:to="ifrs-full_CategoriesOfFinancialAssetsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:to="ifrs-full_CategoriesOfFinancialAssetsDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:label="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:to="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember" xlink:label="ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:to="ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:label="ifrs-full_LevelsOfFairValueHierarchyAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_LevelsOfFairValueHierarchyAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:label="ifrs-full_LevelsOfFairValueHierarchyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:to="ifrs-full_LevelsOfFairValueHierarchyDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:label="ifrs-full_LevelsOfFairValueHierarchyDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:to="ifrs-full_LevelsOfFairValueHierarchyDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level1OfFairValueHierarchyMember" xlink:label="ifrs-full_Level1OfFairValueHierarchyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:to="ifrs-full_Level1OfFairValueHierarchyMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level2OfFairValueHierarchyMember" xlink:label="ifrs-full_Level2OfFairValueHierarchyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:to="ifrs-full_Level2OfFairValueHierarchyMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level3OfFairValueHierarchyMember" xlink:label="ifrs-full_Level3OfFairValueHierarchyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:to="ifrs-full_Level3OfFairValueHierarchyMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets" xlink:label="ifrs-full_FinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_FinancialAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValue" xlink:label="ifrs-full_FinancialAssetsAtFairValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_FinancialAssetsAtFairValue" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsMovementInFinancialAssetsIncludedInLevel3OfFairValueHierarchyDetails" xlink:type="extended" xlink:title="99942206 - Disclosure - Financial Instruments - Movement in financial assets included in Level 3 of fair value hierarchy (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:label="ifrs-full_CategoriesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CategoriesOfFinancialAssetsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:to="ifrs-full_CategoriesOfFinancialAssetsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:to="ifrs-full_CategoriesOfFinancialAssetsDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:label="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:to="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember" xlink:label="ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:to="ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:label="ifrs-full_LevelsOfFairValueHierarchyAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_LevelsOfFairValueHierarchyAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:label="ifrs-full_LevelsOfFairValueHierarchyDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:to="ifrs-full_LevelsOfFairValueHierarchyDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:label="ifrs-full_LevelsOfFairValueHierarchyDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:to="ifrs-full_LevelsOfFairValueHierarchyDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level3OfFairValueHierarchyMember" xlink:label="ifrs-full_Level3OfFairValueHierarchyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:to="ifrs-full_Level3OfFairValueHierarchyMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets" xlink:label="ifrs-full_FinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_FinancialAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncreaseThroughBusinessCombinationFinancialAssets" xlink:label="himx_IncreaseThroughBusinessCombinationFinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IncreaseThroughBusinessCombinationFinancialAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseThroughOriginationOrPurchaseFinancialAssets" xlink:label="ifrs-full_IncreaseThroughOriginationOrPurchaseFinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IncreaseThroughOriginationOrPurchaseFinancialAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DecreaseThroughDerecognitionFinancialAssets" xlink:label="ifrs-full_DecreaseThroughDerecognitionFinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DecreaseThroughDerecognitionFinancialAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DecreaseThroughCapitalReductionFinancialAssets" xlink:label="himx_DecreaseThroughCapitalReductionFinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_DecreaseThroughCapitalReductionFinancialAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReclassificationAdjustmentsOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" xlink:label="ifrs-full_ReclassificationAdjustmentsOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ReclassificationAdjustmentsOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RecognizedInToFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:label="himx_RecognizedInToFinancialAssetsAtFairValueThroughProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_RecognizedInToFinancialAssetsAtFairValueThroughProfitOrLoss" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialInstrumentsAdditionalInformationDetails" xlink:type="extended" xlink:title="99942207 - Disclosure - Financial Instruments - Additional Information (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesAxis" xlink:label="ifrs-full_TypesOfInterestRatesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_TypesOfInterestRatesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain" xlink:label="ifrs-full_TypesOfInterestRatesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TypesOfInterestRatesAxis" xlink:to="ifrs-full_TypesOfInterestRatesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain" xlink:label="ifrs-full_TypesOfInterestRatesDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TypesOfInterestRatesAxis" xlink:to="ifrs-full_TypesOfInterestRatesDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FloatingInterestRateMember" xlink:label="ifrs-full_FloatingInterestRateMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TypesOfInterestRatesDomain" xlink:to="ifrs-full_FloatingInterestRateMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="ifrs-full_TypesOfRisksAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_TypesOfRisksAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="ifrs-full_TypesOfRisksDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_TypesOfRisksAxis" xlink:to="ifrs-full_TypesOfRisksDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain" xlink:label="ifrs-full_TypesOfRisksDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_TypesOfRisksAxis" xlink:to="ifrs-full_TypesOfRisksDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiquidityRiskMember" xlink:label="ifrs-full_LiquidityRiskMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_TypesOfRisksDomain" xlink:to="ifrs-full_LiquidityRiskMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NTDMember" xlink:label="himx_NTDMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_TypesOfRisksDomain" xlink:to="himx_NTDMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnobservableInputsAxis" xlink:label="ifrs-full_UnobservableInputsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_UnobservableInputsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnobservableInputsDomain" xlink:label="ifrs-full_UnobservableInputsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_UnobservableInputsAxis" xlink:to="ifrs-full_UnobservableInputsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnobservableInputsDomain" xlink:label="ifrs-full_UnobservableInputsDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_UnobservableInputsAxis" xlink:to="ifrs-full_UnobservableInputsDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateMeasurementInputMember" xlink:label="ifrs-full_InterestRateMeasurementInputMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_UnobservableInputsDomain" xlink:to="ifrs-full_InterestRateMeasurementInputMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PercentageOfDepreciationAppreciationAgainstOtherCountryCurrency" xlink:label="himx_PercentageOfDepreciationAppreciationAgainstOtherCountryCurrency" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_PercentageOfDepreciationAppreciationAgainstOtherCountryCurrency" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughForeignExchangeFinancialAssets" xlink:label="ifrs-full_IncreaseDecreaseThroughForeignExchangeFinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IncreaseDecreaseThroughForeignExchangeFinancialAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:label="ifrs-full_BorrowingsAdjustmentToInterestRateBasis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_BorrowingsAdjustmentToInterestRateBasis" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncreaseDecreaseNetProfitThroughInterestRate" xlink:label="himx_IncreaseDecreaseNetProfitThroughInterestRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IncreaseDecreaseNetProfitThroughInterestRate" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PercentageOfSignificantUnobservableInputAssets" xlink:label="himx_PercentageOfSignificantUnobservableInputAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_PercentageOfSignificantUnobservableInputAssets" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialRiskManagementPercentageOfRevenuesDetails" xlink:type="extended" xlink:title="99942301 - Disclosure - Financial Risk Management - Percentage of revenues (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersAxis" xlink:label="ifrs-full_MajorCustomersAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_MajorCustomersAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersDomain" xlink:label="ifrs-full_MajorCustomersDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_MajorCustomersAxis" xlink:to="ifrs-full_MajorCustomersDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersDomain" xlink:label="ifrs-full_MajorCustomersDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_MajorCustomersAxis" xlink:to="ifrs-full_MajorCustomersDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CustomerAAndItsAffiliatesMember" xlink:label="himx_CustomerAAndItsAffiliatesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_MajorCustomersDomain" xlink:to="himx_CustomerAAndItsAffiliatesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CustomerCMember" xlink:label="himx_CustomerCMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_MajorCustomersDomain" xlink:to="himx_CustomerCMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PercentageOfEntitysRevenue" xlink:label="ifrs-full_PercentageOfEntitysRevenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_PercentageOfEntitysRevenue" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureFinancialRiskManagementPercentageOfAccountsReceivableDetails" xlink:type="extended" xlink:title="99942302 - Disclosure - Financial Risk Management - Percentage of accounts receivable (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersAxis" xlink:label="ifrs-full_MajorCustomersAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_MajorCustomersAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersDomain" xlink:label="ifrs-full_MajorCustomersDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_MajorCustomersAxis" xlink:to="ifrs-full_MajorCustomersDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersDomain" xlink:label="ifrs-full_MajorCustomersDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_MajorCustomersAxis" xlink:to="ifrs-full_MajorCustomersDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CustomerAAndItsAffiliatesMember" xlink:label="himx_CustomerAAndItsAffiliatesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_MajorCustomersDomain" xlink:to="himx_CustomerAAndItsAffiliatesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CustomerCMember" xlink:label="himx_CustomerCMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_MajorCustomersDomain" xlink:to="himx_CustomerCMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PercentageOfAccountsReceivables" xlink:label="himx_PercentageOfAccountsReceivables" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_PercentageOfAccountsReceivables" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureRelatedPartyTransactionsDetails" xlink:type="extended" xlink:title="99942501 - Disclosure - Related-party Transactions (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_CategoriesOfRelatedPartiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:to="ifrs-full_CategoriesOfRelatedPartiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:to="ifrs-full_CategoriesOfRelatedPartiesDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ChengMeiMaterialsTechnologyCorporationMember" xlink:label="himx_ChengMeiMaterialsTechnologyCorporationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:to="himx_ChengMeiMaterialsTechnologyCorporationMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssociatesMember" xlink:label="ifrs-full_AssociatesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:to="ifrs-full_AssociatesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherRelatedPartiesMember" xlink:label="ifrs-full_OtherRelatedPartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:to="ifrs-full_OtherRelatedPartiesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ViewsilMicroelectronicsKunshanLimitedMember" xlink:label="himx_ViewsilMicroelectronicsKunshanLimitedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:to="himx_ViewsilMicroelectronicsKunshanLimitedMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions" xlink:label="ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmountsReceivableRelatedPartyTransactions" xlink:label="ifrs-full_AmountsReceivableRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AmountsReceivableRelatedPartyTransactions" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchasesOfGoodsRelatedPartyTransactions" xlink:label="ifrs-full_PurchasesOfGoodsRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_PurchasesOfGoodsRelatedPartyTransactions" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RevenueFromMiscellaneousServicesRelatedPartyTransactions" xlink:label="himx_RevenueFromMiscellaneousServicesRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_RevenueFromMiscellaneousServicesRelatedPartyTransactions" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_TechnicalServiceFeesRelatedPartyTransaction" xlink:label="himx_TechnicalServiceFeesRelatedPartyTransaction" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_TechnicalServiceFeesRelatedPartyTransaction" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_MiscellaneousFeeRelatedPartyTransactions" xlink:label="himx_MiscellaneousFeeRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_MiscellaneousFeeRelatedPartyTransactions" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OtherReceivablesDueFromRelatedParties" xlink:label="himx_OtherReceivablesDueFromRelatedParties" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_OtherReceivablesDueFromRelatedParties" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeAndOtherCurrentPayablesToRelatedParties" xlink:label="ifrs-full_TradeAndOtherCurrentPayablesToRelatedParties" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_TradeAndOtherCurrentPayablesToRelatedParties" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties" xlink:label="ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmountsPayableRelatedPartyTransactions" xlink:label="ifrs-full_AmountsPayableRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AmountsPayableRelatedPartyTransactions" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosurePledgedAssetsDetails" xlink:type="extended" xlink:title="99942601 - Disclosure - Pledged assets (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfPledgedAssetsTable" xlink:label="himx_DisclosureOfPledgedAssetsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_DisclosureOfPledgedAssetsTable" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" priority="2" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LandMember" xlink:label="ifrs-full_LandMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="ifrs-full_LandMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_BuildingsAndImprovementsMember" xlink:label="himx_BuildingsAndImprovementsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="himx_BuildingsAndImprovementsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="himx_DisclosureOfPledgedAssetsTable" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:to="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember" xlink:label="ifrs-full_LongtermBorrowingsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain" xlink:to="ifrs-full_LongtermBorrowingsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DisclosureOfPledgedAssetsLineItems" xlink:label="himx_DisclosureOfPledgedAssetsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_DisclosureOfPledgedAssetsLineItems" xlink:to="himx_DisclosureOfPledgedAssetsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SecuredBankLoansReceived" xlink:label="ifrs-full_SecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_DisclosureOfPledgedAssetsLineItems" xlink:to="ifrs-full_SecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentRestrictedCashAndCashEquivalents" xlink:label="ifrs-full_NoncurrentRestrictedCashAndCashEquivalents" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_DisclosureOfPledgedAssetsLineItems" xlink:to="ifrs-full_NoncurrentRestrictedCashAndCashEquivalents" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentPledgedAsSecurity" xlink:label="ifrs-full_PropertyPlantAndEquipmentPledgedAsSecurity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_DisclosureOfPledgedAssetsLineItems" xlink:to="ifrs-full_PropertyPlantAndEquipmentPledgedAsSecurity" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedCashAndCashEquivalents" xlink:label="ifrs-full_RestrictedCashAndCashEquivalents" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_DisclosureOfPledgedAssetsLineItems" xlink:to="ifrs-full_RestrictedCashAndCashEquivalents" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationScheduleOfSegmentReportingDetails" xlink:type="extended" xlink:title="99942801 - Disclosure - Segment, Product and Geographic Information - Schedule of segment reporting (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="ifrs-full_ProductsAndServicesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:to="ifrs-full_ProductsAndServicesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain" xlink:label="ifrs-full_ProductsAndServicesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ProductsAndServicesAxis" xlink:to="ifrs-full_ProductsAndServicesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain" xlink:label="ifrs-full_ProductsAndServicesDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ProductsAndServicesAxis" xlink:to="ifrs-full_ProductsAndServicesDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DriverICMember" xlink:label="himx_DriverICMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ProductsAndServicesDomain" xlink:to="himx_DriverICMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NonDriverICMember" xlink:label="himx_NonDriverICMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ProductsAndServicesDomain" xlink:to="himx_NonDriverICMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_DisclosureOfOperatingSegmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsNumberOfOperatingSegments" xlink:label="himx_IfrsNumberOfOperatingSegments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="himx_IfrsNumberOfOperatingSegments" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue" xlink:label="ifrs-full_Revenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_Revenue" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossFromOperatingActivities" xlink:label="ifrs-full_ProfitLossFromOperatingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_ProfitLossFromOperatingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherOperatingIncomeExpense" xlink:label="ifrs-full_OtherOperatingIncomeExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_OtherOperatingIncomeExpense" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossBeforeTax" xlink:label="ifrs-full_ProfitLossBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_ProfitLossBeforeTax" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_SignificantNoncashItemAbstract" xlink:label="himx_SignificantNoncashItemAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="himx_SignificantNoncashItemAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForSharebasedPayments" xlink:label="ifrs-full_AdjustmentsForSharebasedPayments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_SignificantNoncashItemAbstract" xlink:to="ifrs-full_AdjustmentsForSharebasedPayments" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationAndAmortisationExpense" xlink:label="ifrs-full_DepreciationAndAmortisationExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_SignificantNoncashItemAbstract" xlink:to="ifrs-full_DepreciationAndAmortisationExpense" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationSegmentRevenuesFromCustomersInDifferentGeographicRegionDetails" xlink:type="extended" xlink:title="99942802 - Disclosure - Segment, Product and Geographic Information - Segment revenues from customers in different geographic region (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="ifrs-full_ProductsAndServicesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:to="ifrs-full_ProductsAndServicesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain" xlink:label="ifrs-full_ProductsAndServicesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ProductsAndServicesAxis" xlink:to="ifrs-full_ProductsAndServicesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain" xlink:label="ifrs-full_ProductsAndServicesDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ProductsAndServicesAxis" xlink:to="ifrs-full_ProductsAndServicesDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DriverICMember" xlink:label="himx_DriverICMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ProductsAndServicesDomain" xlink:to="himx_DriverICMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NonDriverICMember" xlink:label="himx_NonDriverICMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ProductsAndServicesDomain" xlink:to="himx_NonDriverICMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="ifrs-full_GeographicalAreasAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:to="ifrs-full_GeographicalAreasAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="ifrs-full_GeographicalAreasDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_GeographicalAreasAxis" xlink:to="ifrs-full_GeographicalAreasDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="ifrs-full_GeographicalAreasDomain_639101987909077704" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_GeographicalAreasAxis" xlink:to="ifrs-full_GeographicalAreasDomain_639101987909077704" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN" xlink:label="country_CN" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_CN" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_TW" xlink:label="country_TW" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_TW" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP" xlink:label="country_JP" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_JP" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX" xlink:label="country_MX" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_MX" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AmericasMember" xlink:label="srt_AmericasMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="srt_AmericasMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_KR" xlink:label="country_KR" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_KR" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OthersMember" xlink:label="himx_OthersMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="himx_OthersMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_DisclosureOfOperatingSegmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue" xlink:label="ifrs-full_Revenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_Revenue" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationSegmentRevenuesFromMajorProductLinesDetails" xlink:type="extended" xlink:title="99942803 - Disclosure - Segment, Product and Geographic Information - Segment revenues from major product lines (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="ifrs-full_ProductsAndServicesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:to="ifrs-full_ProductsAndServicesAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain" xlink:label="ifrs-full_ProductsAndServicesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ProductsAndServicesAxis" xlink:to="ifrs-full_ProductsAndServicesDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain" xlink:label="ifrs-full_ProductsAndServicesDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ProductsAndServicesAxis" xlink:to="ifrs-full_ProductsAndServicesDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DriverICMember" xlink:label="himx_DriverICMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ProductsAndServicesDomain" xlink:to="himx_DriverICMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NonDriverICMember" xlink:label="himx_NonDriverICMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ProductsAndServicesDomain" xlink:to="himx_NonDriverICMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ApplicationsAxis" xlink:label="himx_ApplicationsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:to="himx_ApplicationsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ApplicationsDomain" xlink:label="himx_ApplicationsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_ApplicationsAxis" xlink:to="himx_ApplicationsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ApplicationsDomain" xlink:label="himx_ApplicationsDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_ApplicationsAxis" xlink:to="himx_ApplicationsDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LargeSizeApplicationsMember" xlink:label="himx_LargeSizeApplicationsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_ApplicationsDomain" xlink:to="himx_LargeSizeApplicationsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_SmallAndMediumSizedApplicationsMember" xlink:label="himx_SmallAndMediumSizedApplicationsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_ApplicationsDomain" xlink:to="himx_SmallAndMediumSizedApplicationsMember" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NonDriverProductsMember" xlink:label="himx_NonDriverProductsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_ApplicationsDomain" xlink:to="himx_NonDriverProductsMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_DisclosureOfOperatingSegmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue" xlink:label="ifrs-full_Revenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_Revenue" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationCarryingValuesOfCompanySTangibleLongLivedAssetsDetails" xlink:type="extended" xlink:title="99942804 - Disclosure - Segment, Product and Geographic Information - Carrying values of the Company's tangible long-lived assets (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="ifrs-full_GeographicalAreasAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:to="ifrs-full_GeographicalAreasAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="ifrs-full_GeographicalAreasDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_GeographicalAreasAxis" xlink:to="ifrs-full_GeographicalAreasDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain" xlink:label="ifrs-full_GeographicalAreasDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_GeographicalAreasAxis" xlink:to="ifrs-full_GeographicalAreasDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_TW" xlink:label="country_TW" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_TW" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US" xlink:label="country_US" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_US" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN" xlink:label="country_CN" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_CN" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_KP" xlink:label="country_KP" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_KP" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP" xlink:label="country_JP" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_GeographicalAreasDomain" xlink:to="country_JP" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_DisclosureOfOperatingSegmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipment" xlink:label="ifrs-full_PropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_PropertyPlantAndEquipment" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationRevenuesFromSignificantCustomersDetails" xlink:type="extended" xlink:title="99942805 - Disclosure - Segment, Product and Geographic Information - Revenues from significant customers (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis" xlink:label="ifrs-full_SegmentsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:to="ifrs-full_SegmentsAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain" xlink:label="ifrs-full_SegmentsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_SegmentsAxis" xlink:to="ifrs-full_SegmentsDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain" xlink:label="ifrs-full_SegmentsDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_SegmentsAxis" xlink:to="ifrs-full_SegmentsDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DriverIcSegmentMember" xlink:label="himx_DriverIcSegmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_SegmentsDomain" xlink:to="himx_DriverIcSegmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_NonDriverSegmentMember" xlink:label="himx_NonDriverSegmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_SegmentsDomain" xlink:to="himx_NonDriverSegmentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersAxis" xlink:label="ifrs-full_MajorCustomersAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:to="ifrs-full_MajorCustomersAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersDomain" xlink:label="ifrs-full_MajorCustomersDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_MajorCustomersAxis" xlink:to="ifrs-full_MajorCustomersDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersDomain" xlink:label="ifrs-full_MajorCustomersDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_MajorCustomersAxis" xlink:to="ifrs-full_MajorCustomersDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CustomerAAndItsAffiliatesMember" xlink:label="himx_CustomerAAndItsAffiliatesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_MajorCustomersDomain" xlink:to="himx_CustomerAAndItsAffiliatesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CustomerCMember" xlink:label="himx_CustomerCMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_MajorCustomersDomain" xlink:to="himx_CustomerCMember" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_DisclosureOfOperatingSegmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue" xlink:label="ifrs-full_Revenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_Revenue" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureSegmentProductAndGeographicInformationAccountsReceivableFromSignificantCustomersDetails" xlink:type="extended" xlink:title="99942806 - Disclosure - Segment, Product and Geographic Information - Accounts receivable from significant customers (Details)">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersAxis" xlink:label="ifrs-full_MajorCustomersAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:to="ifrs-full_MajorCustomersAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersDomain" xlink:label="ifrs-full_MajorCustomersDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_MajorCustomersAxis" xlink:to="ifrs-full_MajorCustomersDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorCustomersDomain" xlink:label="ifrs-full_MajorCustomersDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_MajorCustomersAxis" xlink:to="ifrs-full_MajorCustomersDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CustomerAAndItsAffiliatesMember" xlink:label="himx_CustomerAAndItsAffiliatesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_MajorCustomersDomain" xlink:to="himx_CustomerAAndItsAffiliatesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CustomerCMember" xlink:label="himx_CustomerCMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_MajorCustomersDomain" xlink:to="himx_CustomerCMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="ifrs-full_DisclosureOfOperatingSegmentsLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_DisclosureOfOperatingSegmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeReceivables" xlink:label="ifrs-full_TradeReceivables" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:to="ifrs-full_TradeReceivables" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureNatureOfExpensesDepreciationOfPropertyPlantAndEquipmentDetails" xlink:type="extended" xlink:title="99942901 - Disclosure - The Nature of Expenses - Depreciation of property, plant and equipment (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementAxis" xlink:label="himx_IncomeStatementAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="himx_IncomeStatementAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementDomain" xlink:label="himx_IncomeStatementDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IncomeStatementAxis" xlink:to="himx_IncomeStatementDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementDomain" xlink:label="himx_IncomeStatementDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IncomeStatementAxis" xlink:to="himx_IncomeStatementDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CostOfRevenueMember" xlink:label="himx_CostOfRevenueMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IncomeStatementDomain" xlink:to="himx_CostOfRevenueMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OperatingExpensesMember" xlink:label="himx_OperatingExpensesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IncomeStatementDomain" xlink:to="himx_OperatingExpensesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:label="ifrs-full_DepreciationPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_DepreciationPropertyPlantAndEquipment" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureNatureOfExpensesAmortizationOfIntangibleAssetsDetails" xlink:type="extended" xlink:title="99942902 - Disclosure - The Nature of Expenses - Amortization of intangible assets (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementAxis" xlink:label="himx_IncomeStatementAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="himx_IncomeStatementAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementDomain" xlink:label="himx_IncomeStatementDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IncomeStatementAxis" xlink:to="himx_IncomeStatementDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementDomain" xlink:label="himx_IncomeStatementDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IncomeStatementAxis" xlink:to="himx_IncomeStatementDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CostOfRevenueMember" xlink:label="himx_CostOfRevenueMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IncomeStatementDomain" xlink:to="himx_CostOfRevenueMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OperatingExpensesMember" xlink:label="himx_OperatingExpensesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IncomeStatementDomain" xlink:to="himx_OperatingExpensesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:label="ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureNatureOfExpensesEmployeeBenefitsExpenseSummarizedByFunctionDetails" xlink:type="extended" xlink:title="99942904 - Disclosure - The Nature of Expenses - Employee benefits expense summarized by function (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementAxis" xlink:label="himx_IncomeStatementAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="himx_IncomeStatementAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementDomain" xlink:label="himx_IncomeStatementDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="himx_IncomeStatementAxis" xlink:to="himx_IncomeStatementDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IncomeStatementDomain" xlink:label="himx_IncomeStatementDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="himx_IncomeStatementAxis" xlink:to="himx_IncomeStatementDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CostOfRevenueMember" xlink:label="himx_CostOfRevenueMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_IncomeStatementDomain" xlink:to="himx_CostOfRevenueMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_OperatingExpensesMember" xlink:label="himx_OperatingExpensesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IncomeStatementDomain" xlink:to="himx_OperatingExpensesMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EmployeeBenefitsExpense" xlink:label="ifrs-full_EmployeeBenefitsExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_EmployeeBenefitsExpense" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfFinancialPositionDetails" xlink:type="extended" xlink:title="99943001 - Disclosure - Himax Technologies, Inc. (the Parent Company only) - Condensed Statements of Financial Position (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_EquityAttributableToOwnersOfParentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="ifrs-full_CashAndCashEquivalents" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CashAndCashEquivalents" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherCurrentAssets" xlink:label="ifrs-full_OtherCurrentAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_OtherCurrentAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss" xlink:label="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:label="ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Assets" xlink:label="ifrs-full_Assets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_Assets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLiabilities" xlink:label="ifrs-full_CurrentLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CurrentLiabilities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentPortionOfLongtermBorrowings" xlink:label="ifrs-full_CurrentPortionOfLongtermBorrowings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CurrentPortionOfLongtermBorrowings" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SecuredBankLoansReceived" xlink:label="ifrs-full_SecuredBankLoansReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_SecuredBankLoansReceived" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DebtBorrowingsFromSubsidiary" xlink:label="himx_DebtBorrowingsFromSubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_DebtBorrowingsFromSubsidiary" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowings" xlink:label="ifrs-full_LongtermBorrowings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_LongtermBorrowings" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity" xlink:label="ifrs-full_Equity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_Equity" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAndLiabilities" xlink:label="ifrs-full_EquityAndLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_EquityAndLiabilities" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfProfitOrLossDetails" xlink:type="extended" xlink:title="99943002 - Disclosure - Himax Technologies, Inc. (the Parent Company only) - Condensed Statements of Profit or Loss (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987909234382" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987909234382" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_EquityAttributableToOwnersOfParentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue" xlink:label="ifrs-full_Revenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_Revenue" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_TotalCostAndExpenses" xlink:label="himx_TotalCostAndExpenses" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_TotalCostAndExpenses" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossFromOperatingActivities" xlink:label="ifrs-full_ProfitLossFromOperatingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProfitLossFromOperatingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueFromInterest" xlink:label="ifrs-full_RevenueFromInterest" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_RevenueFromInterest" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:label="ifrs-full_AdjustmentsForFairValueGainsLosses" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_AdjustmentsForFairValueGainsLosses" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ForeignCurrencyExchangeLossesNet" xlink:label="himx_ForeignCurrencyExchangeLossesNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_ForeignCurrencyExchangeLossesNet" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinanceCosts" xlink:label="ifrs-full_FinanceCosts" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_FinanceCosts" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LossOnReMeasurementOfBusinessCombination" xlink:label="himx_LossOnReMeasurementOfBusinessCombination" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_LossOnReMeasurementOfBusinessCombination" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:label="ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossBeforeTax" xlink:label="ifrs-full_ProfitLossBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProfitLossBeforeTax" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IncomeTaxExpenseContinuingOperations" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProfitLoss" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfOtherComprehensiveIncomeDetails" xlink:type="extended" xlink:title="99943003 - Disclosure - Himax Technologies, Inc. (the Parent Company only) - Condensed Statements of Other Comprehensive Income (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987909390628" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987909390628" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_EquityAttributableToOwnersOfParentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ProfitLoss" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeAbstract" xlink:label="ifrs-full_OtherComprehensiveIncomeAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_OtherComprehensiveIncomeAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:label="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_OtherComprehensiveIncomeAbstract" xlink:to="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:label="ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:to="ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReclassificationAdjustmentsOnChangeInValueOfForeignCurrencyBasisSpreadsBeforeTax" xlink:label="ifrs-full_ReclassificationAdjustmentsOnChangeInValueOfForeignCurrencyBasisSpreadsBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:to="ifrs-full_ReclassificationAdjustmentsOnChangeInValueOfForeignCurrencyBasisSpreadsBeforeTax" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss" xlink:label="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:to="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:label="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_OtherComprehensiveIncomeAbstract" xlink:to="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnChangeInValueOfForeignCurrencyBasisSpreadsBeforeTax" xlink:label="ifrs-full_GainsLossesOnChangeInValueOfForeignCurrencyBasisSpreadsBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:to="ifrs-full_GainsLossesOnChangeInValueOfForeignCurrencyBasisSpreadsBeforeTax" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="ifrs-full_OtherComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_OtherComprehensiveIncomeAbstract" xlink:to="ifrs-full_OtherComprehensiveIncome" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComprehensiveIncome" xlink:label="ifrs-full_ComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_ComprehensiveIncome" priority="1" use="optional" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.himax.com.tw/role/DisclosureHimaxTechnologiesIncParentCompanyOnlyCondensedStatementsOfCashFlowsDetails" xlink:type="extended" xlink:title="99943004 - Disclosure - Himax Technologies, Inc. (the Parent Company only) - Condensed Statements of Cash Flows (Details)">
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementTable" xlink:label="himx_IfrsStatementTable" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="himx_IfrsStatementTable" xlink:to="ifrs-full_ComponentsOfEquityAxis" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain" xlink:label="ifrs-full_ComponentsOfEquityDomain_639101987909390628" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="ifrs-full_ComponentsOfEquityAxis" xlink:to="ifrs-full_ComponentsOfEquityDomain_639101987909390628" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_ComponentsOfEquityDomain" xlink:to="ifrs-full_EquityAttributableToOwnersOfParentMember" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_IfrsStatementLineItems" xlink:label="himx_IfrsStatementLineItems" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="himx_IfrsStatementLineItems" xlink:to="himx_IfrsStatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:to="ifrs-full_ProfitLoss" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:label="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:to="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:label="ifrs-full_AdjustmentsForFairValueGainsLosses" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="ifrs-full_AdjustmentsForFairValueGainsLosses" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRevenueExpense" xlink:label="ifrs-full_InterestRevenueExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="ifrs-full_InterestRevenueExpense" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinanceCosts" xlink:label="ifrs-full_FinanceCosts" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="ifrs-full_FinanceCosts" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:label="ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_LossOnReMeasurementOfBusinessCombination" xlink:label="himx_LossOnReMeasurementOfBusinessCombination" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="himx_LossOnReMeasurementOfBusinessCombination" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains" xlink:label="ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_CashFlowsFromOperatingActivitiesBeforeChangesInOperatingCapital" xlink:label="himx_CashFlowsFromOperatingActivitiesBeforeChangesInOperatingCapital" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="himx_CashFlowsFromOperatingActivitiesBeforeChangesInOperatingCapital" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ChangesInOperatingCapitalAbstract" xlink:label="himx_ChangesInOperatingCapitalAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:to="himx_ChangesInOperatingCapitalAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="himx_ChangesInOperatingCapitalAbstract" xlink:to="ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInOtherCurrentLiabilities" xlink:label="ifrs-full_AdjustmentsForIncreaseDecreaseInOtherCurrentLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="himx_ChangesInOperatingCapitalAbstract" xlink:to="ifrs-full_AdjustmentsForIncreaseDecreaseInOtherCurrentLiabilities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperations" xlink:label="ifrs-full_CashFlowsFromUsedInOperations" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_ChangesInOperatingCapitalAbstract" xlink:to="ifrs-full_CashFlowsFromUsedInOperations" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:label="ifrs-full_InterestReceivedClassifiedAsOperatingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_ChangesInOperatingCapitalAbstract" xlink:to="ifrs-full_InterestReceivedClassifiedAsOperatingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:label="ifrs-full_InterestPaidClassifiedAsOperatingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_ChangesInOperatingCapitalAbstract" xlink:to="ifrs-full_InterestPaidClassifiedAsOperatingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:to="ifrs-full_CashFlowsFromUsedInOperatingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AcquisitionsOfFinancialAssetsAtAmortizedCost" xlink:label="himx_AcquisitionsOfFinancialAssetsAtAmortizedCost" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="himx_AcquisitionsOfFinancialAssetsAtAmortizedCost" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ProceedsFromDisposalOfFinancialAssetsAtAmortizedCost" xlink:label="himx_ProceedsFromDisposalOfFinancialAssetsAtAmortizedCost" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="himx_ProceedsFromDisposalOfFinancialAssetsAtAmortizedCost" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AcquisitionsOfFinancialAssetsAtFairValueThroughProfitOrLoss" xlink:label="himx_AcquisitionsOfFinancialAssetsAtFairValueThroughProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="himx_AcquisitionsOfFinancialAssetsAtFairValueThroughProfitOrLoss" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AcquisitionsOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncome" xlink:label="himx_AcquisitionsOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="himx_AcquisitionsOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncome" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_AcquisitionsOfEquityMethodInvestments" xlink:label="himx_AcquisitionsOfEquityMethodInvestments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="himx_AcquisitionsOfEquityMethodInvestments" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="ifrs-full_CashFlowsFromUsedInInvestingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:label="ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_PrepaymentsForPurchasingTreasuryShares" xlink:label="himx_PrepaymentsForPurchasingTreasuryShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_PrepaymentsForPurchasingTreasuryShares" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:label="ifrs-full_DividendsPaidClassifiedAsFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="ifrs-full_DividendsPaidClassifiedAsFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_DividendsEquivalentsClassifiedAsFinancingActivities" xlink:label="himx_DividendsEquivalentsClassifiedAsFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_DividendsEquivalentsClassifiedAsFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RepaymentsOfLongTermSecuredBorrowingsClassifiedAsFinancingActivities" xlink:label="himx_RepaymentsOfLongTermSecuredBorrowingsClassifiedAsFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_RepaymentsOfLongTermSecuredBorrowingsClassifiedAsFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ProceedsFromSecuredBorrowings" xlink:label="himx_ProceedsFromSecuredBorrowings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_ProceedsFromSecuredBorrowings" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RepaymentsOfSecuredBorrowings" xlink:label="himx_RepaymentsOfSecuredBorrowings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_RepaymentsOfSecuredBorrowings" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromIssuingOtherEquityInstruments" xlink:label="ifrs-full_ProceedsFromIssuingOtherEquityInstruments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="ifrs-full_ProceedsFromIssuingOtherEquityInstruments" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_ProceedsFromDebtFromASubsidiary" xlink:label="himx_ProceedsFromDebtFromASubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_ProceedsFromDebtFromASubsidiary" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="himx-20251231.xsd#himx_RepaymentOfDebtFromASubsidiary" xlink:label="himx_RepaymentOfDebtFromASubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="himx_RepaymentOfDebtFromASubsidiary" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="ifrs-full_CashFlowsFromUsedInFinancingActivities" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:label="ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" priority="1" use="optional" />
    <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="ifrs-full_CashAndCashEquivalents" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="himx_IfrsStatementLineItems" xlink:to="ifrs-full_CashAndCashEquivalents" priority="1" use="optional" />
  </link:definitionLink>
</link:linkbase>
