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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019ceccc-664a-7c3d-8b96-810c336c4f93,g:e96db443-5a6a-4901-9d2b-f56fb6001ec0-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://iperionx.com/role/Cover" xlink:type="simple" xlink:href="ipx-20260630.xsd#Cover"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesTable_019ceccc-6780-7986-9178-6ed86a199d78" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityAddressesTable_019ceccc-6780-7986-9178-6ed86a199d78" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_019ceccc-6780-7d4c-808d-e823838e2a8a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressesAddressTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityAddressesTable_019ceccc-6780-7986-9178-6ed86a199d78" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_019ceccc-6780-7d4c-808d-e823838e2a8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_019ceccc-6780-7d4c-808d-e823838e2a8a_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_019ceccc-6780-7d4c-808d-e823838e2a8a" xlink:to="loc_dei_AddressTypeDomain_019ceccc-6780-7d4c-808d-e823838e2a8a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_019ceccc-6780-70e8-85d8-afdb4e22804d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_019ceccc-6780-7d4c-808d-e823838e2a8a" xlink:to="loc_dei_AddressTypeDomain_019ceccc-6780-70e8-85d8-afdb4e22804d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_BusinessContactMember_019ceccc-6780-7ec8-b1c3-293e79c1255c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_BusinessContactMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AddressTypeDomain_019ceccc-6780-70e8-85d8-afdb4e22804d" xlink:to="loc_dei_BusinessContactMember_019ceccc-6780-7ec8-b1c3-293e79c1255c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019ceccc-6780-75c1-8625-6ecbcef9fdf4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentType_019ceccc-6780-75c1-8625-6ecbcef9fdf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentRegistrationStatement_019ceccc-6780-7c14-9f47-be9591423658" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentRegistrationStatement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentRegistrationStatement_019ceccc-6780-7c14-9f47-be9591423658" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport_019ceccc-6780-78f7-98f9-ab5a33c236a3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentAnnualReport_019ceccc-6780-78f7-98f9-ab5a33c236a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019ceccc-6780-79b0-b5de-27702d8081fc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentPeriodEndDate_019ceccc-6780-79b0-b5de-27702d8081fc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019ceccc-6780-7e04-aff3-d5157a9ae8fd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_CurrentFiscalYearEndDate_019ceccc-6780-7e04-aff3-d5157a9ae8fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019ceccc-6780-7150-9d22-3890077e4264" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentTransitionReport_019ceccc-6780-7150-9d22-3890077e4264" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentShellCompanyReport_019ceccc-6780-7d7b-a7cd-0d3d7eace812" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentShellCompanyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentShellCompanyReport_019ceccc-6780-7d7b-a7cd-0d3d7eace812" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019ceccc-6780-7dfb-8f20-74482dfb314d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityFileNumber_019ceccc-6780-7dfb-8f20-74482dfb314d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019ceccc-6780-7e5f-8563-15b19f8b3430" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityAddressAddressLine1_019ceccc-6780-7e5f-8563-15b19f8b3430" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019ceccc-6780-7913-afbd-066767a0747f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityAddressCityOrTown_019ceccc-6780-7913-afbd-066767a0747f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019ceccc-6780-7fb0-aeba-2dc0bc49b60b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityAddressStateOrProvince_019ceccc-6780-7fb0-aeba-2dc0bc49b60b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019ceccc-6780-7338-9319-0e83a4c7330b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityAddressPostalZipCode_019ceccc-6780-7338-9319-0e83a4c7330b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ContactPersonnelName_019ceccc-6780-78b6-8c2e-1785d178a27a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ContactPersonnelName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_ContactPersonnelName_019ceccc-6780-78b6-8c2e-1785d178a27a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019ceccc-6780-734c-af81-ffbfe7cf1c27" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_CityAreaCode_019ceccc-6780-734c-af81-ffbfe7cf1c27" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019ceccc-6780-70b0-a5f2-057b6d8c91be" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_LocalPhoneNumber_019ceccc-6780-70b0-a5f2-057b6d8c91be" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ContactPersonnelEmailAddress_019ceccc-6780-725e-8eb6-23d028ffccd8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ContactPersonnelEmailAddress"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_ContactPersonnelEmailAddress_019ceccc-6780-725e-8eb6-23d028ffccd8" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019ceccc-6780-7a86-960f-28265f7a6b66" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_Security12bTitle_019ceccc-6780-7a86-960f-28265f7a6b66" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019ceccc-6780-7fe2-bba6-3aca1f8c15d5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_TradingSymbol_019ceccc-6780-7fe2-bba6-3aca1f8c15d5" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019ceccc-6780-73fd-b6fe-7786a6013804" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_SecurityExchangeName_019ceccc-6780-73fd-b6fe-7786a6013804" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019ceccc-6780-7a8a-878c-12994e68a96d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019ceccc-6780-7a8a-878c-12994e68a96d" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_019ceccc-6780-7607-aa65-a42ae2db131b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_019ceccc-6780-7607-aa65-a42ae2db131b" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityVoluntaryFilers_019ceccc-6780-7aed-8628-218d33cccb5e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityVoluntaryFilers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityVoluntaryFilers_019ceccc-6780-7aed-8628-218d33cccb5e" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019ceccc-6780-716a-9817-6fb55dd48fbb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityCurrentReportingStatus_019ceccc-6780-716a-9817-6fb55dd48fbb" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019ceccc-6780-7214-ad27-eb1e670966f2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityInteractiveDataCurrent_019ceccc-6780-7214-ad27-eb1e670966f2" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019ceccc-6780-759c-8f5e-5e25bcb2eec0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityFilerCategory_019ceccc-6780-759c-8f5e-5e25bcb2eec0" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019ceccc-6780-7c19-bb55-366e76dcc280" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityEmergingGrowthCompany_019ceccc-6780-7c19-bb55-366e76dcc280" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag_019ceccc-6780-7430-8d86-b3dcf3e01998" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_IcfrAuditorAttestationFlag_019ceccc-6780-7430-8d86-b3dcf3e01998" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFinStmtErrorCorrectionFlag_019ceccc-6780-7dc0-bd3d-f3f268db807b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFinStmtErrorCorrectionFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentFinStmtErrorCorrectionFlag_019ceccc-6780-7dc0-bd3d-f3f268db807b" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAccountingStandard_019ceccc-6780-7f35-90d1-02ffcadd29fb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAccountingStandard"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentAccountingStandard_019ceccc-6780-7f35-90d1-02ffcadd29fb" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019ceccc-6780-7999-9be3-c5b8d2f3bb91" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityShellCompany_019ceccc-6780-7999-9be3-c5b8d2f3bb91" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019ceccc-6780-79ec-8e77-02ece193be3d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_AmendmentFlag_019ceccc-6780-79ec-8e77-02ece193be3d" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019ceccc-6780-768b-a1ac-a541d835483c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentFiscalYearFocus_019ceccc-6780-768b-a1ac-a541d835483c" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019ceccc-6780-7a0a-8a3f-aa203264a977" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019ceccc-6780-7a0a-8a3f-aa203264a977" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019ceccc-6780-74ae-b17d-a4057af2825c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityRegistrantName_019ceccc-6780-74ae-b17d-a4057af2825c" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019ceccc-6780-78d7-8b60-4f97b08c42ee" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityCentralIndexKey_019ceccc-6780-78d7-8b60-4f97b08c42ee" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019ceccc-6780-7056-8997-49b6ff3cc1f4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019ceccc-6780-7056-8997-49b6ff3cc1f4" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCountry_019ceccc-6780-76a0-b086-fd008db79f3d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCountry"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityAddressesLineItems_019ceccc-6780-7239-869a-71edef546b25" xlink:to="loc_dei_EntityAddressCountry_019ceccc-6780-76a0-b086-fd008db79f3d" xlink:type="arc" order="36"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINEQUITY" xlink:type="simple" xlink:href="ipx-20260630.xsd#CONSOLIDATEDSTATEMENTOFCHANGESINEQUITY"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/CONSOLIDATEDSTATEMENTOFCHANGESINEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_019ceccc-681f-7400-a2dc-d60da6376a47" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_019ceccc-681f-70b9-bb07-f2b13f960d94" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_019ceccc-681f-7400-a2dc-d60da6376a47" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_019ceccc-681f-70b9-bb07-f2b13f960d94" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-681f-77b2-926d-8dbd7d7b3190" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_019ceccc-681f-70b9-bb07-f2b13f960d94" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-681f-77b2-926d-8dbd7d7b3190" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-681f-77b2-926d-8dbd7d7b3190_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-681f-77b2-926d-8dbd7d7b3190" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-681f-77b2-926d-8dbd7d7b3190_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-681f-7dcb-bbb2-5a6c2c22c956" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-681f-77b2-926d-8dbd7d7b3190" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-681f-7dcb-bbb2-5a6c2c22c956" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_019ceccc-681f-7085-875d-80a92d03e5fb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-681f-7dcb-bbb2-5a6c2c22c956" xlink:to="loc_ifrs-full_IssuedCapitalMember_019ceccc-681f-7085-875d-80a92d03e5fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfSharebasedPaymentsMember_019ceccc-681f-7020-9856-62e64ff9186c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfSharebasedPaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-681f-7dcb-bbb2-5a6c2c22c956" xlink:to="loc_ifrs-full_ReserveOfSharebasedPaymentsMember_019ceccc-681f-7020-9856-62e64ff9186c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_019ceccc-681f-76fc-8e0e-1558b5e7d8bd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-681f-7dcb-bbb2-5a6c2c22c956" xlink:to="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_019ceccc-681f-76fc-8e0e-1558b5e7d8bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarningsMember_019ceccc-681f-7615-8eed-d4a0dd508c10" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-681f-7dcb-bbb2-5a6c2c22c956" xlink:to="loc_ifrs-full_RetainedEarningsMember_019ceccc-681f-7615-8eed-d4a0dd508c10" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ChangesInEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_019ceccc-681f-7400-a2dc-d60da6376a47" xlink:to="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019ceccc-681f-72b7-847d-e7b810f8453c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ifrs-full_Equity_019ceccc-681f-72b7-847d-e7b810f8453c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_019ceccc-681f-702d-8c4f-013f3350b94e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ifrs-full_ProfitLoss_019ceccc-681f-702d-8c4f-013f3350b94e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation_019ceccc-681f-7a1f-aad7-226528d09703" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation_019ceccc-681f-7a1f-aad7-226528d09703" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome_019ceccc-681f-7c00-912f-73062cdde5dc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ifrs-full_ComprehensiveIncome_019ceccc-681f-7c00-912f-73062cdde5dc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughSharePlacementEquity_019ceccc-681f-712f-ac28-34e5413506be" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughSharePlacementEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ipx_IncreaseDecreaseThroughSharePlacementEquity_019ceccc-681f-712f-ac28-34e5413506be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_019ceccc-681f-7e91-a655-876eec5e324f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_019ceccc-681f-7e91-a655-876eec5e324f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughConversionOfRestrictedShareUnitsEquity_019ceccc-681f-7146-b0eb-bc4ee4d780b1" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughConversionOfRestrictedShareUnitsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ipx_IncreaseDecreaseThroughConversionOfRestrictedShareUnitsEquity_019ceccc-681f-7146-b0eb-bc4ee4d780b1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughConversionOfRightsEquity_019ceccc-681f-7fb0-9577-fade39aa812f" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughConversionOfRightsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ipx_IncreaseDecreaseThroughConversionOfRightsEquity_019ceccc-681f-7fb0-9577-fade39aa812f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughSharesToConsultantsEquity_019ceccc-681f-7229-a590-4bb0f2ea1daf" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughSharesToConsultantsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ipx_IncreaseDecreaseThroughSharesToConsultantsEquity_019ceccc-681f-7229-a590-4bb0f2ea1daf" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughIssueOfDirectorSharesInLieuOfBonusEquity_019ceccc-681f-730d-a382-418452579af7" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughIssueOfDirectorSharesInLieuOfBonusEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ipx_IncreaseDecreaseThroughIssueOfDirectorSharesInLieuOfBonusEquity_019ceccc-681f-730d-a382-418452579af7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughPaymentOfExpensesEquity_019ffbca-c8a5-73a9-b1b8-dbb4ba02aff3" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughPaymentOfExpensesEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ipx_IncreaseDecreaseThroughPaymentOfExpensesEquity_019ffbca-c8a5-73a9-b1b8-dbb4ba02aff3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareIssueRelatedCost_019ceccc-681f-7fa2-a1b4-3306ce4caa0f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareIssueRelatedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ifrs-full_ShareIssueRelatedCost_019ceccc-681f-7fa2-a1b4-3306ce4caa0f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_019ceccc-681f-7270-9231-0735645fe319" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInEquityAbstract_019ceccc-681f-743f-b09d-c9a6f36ed0e8" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_019ceccc-681f-7270-9231-0735645fe319" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019ceccc-681f-7435-be68-8a4942893441" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/STATEMENTOFMATERIALACCOUNTINGPOLICIESBasisOfPreparationDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#STATEMENTOFMATERIALACCOUNTINGPOLICIESBasisOfPreparationDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/STATEMENTOFMATERIALACCOUNTINGPOLICIESBasisOfPreparationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable_019ceccc-681f-70fd-9755-f3be8c4c29b4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable_019ceccc-681f-70fd-9755-f3be8c4c29b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0b516-d535-7699-9029-286964879ba4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable_019ceccc-681f-70fd-9755-f3be8c4c29b4" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0b516-d535-7699-9029-286964879ba4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b516-d535-7699-9029-286964879ba4_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0b516-d535-7699-9029-286964879ba4" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b516-d535-7699-9029-286964879ba4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b516-d535-74e8-bafa-77f221630711" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0b516-d535-7699-9029-286964879ba4" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b516-d535-74e8-bafa-77f221630711" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SharePlacementMember_01a0b516-d535-7ec7-aa75-79ad509152c1" xlink:href="ipx-20260630.xsd#ipx_SharePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b516-d535-74e8-bafa-77f221630711" xlink:to="loc_ipx_SharePlacementMember_01a0b516-d535-7ec7-aa75-79ad509152c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfContractsAxis_01a0b518-ba22-7a2f-bfbc-900e64d5a2b1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfContractsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable_019ceccc-681f-70fd-9755-f3be8c4c29b4" xlink:to="loc_ifrs-full_TypesOfContractsAxis_01a0b518-ba22-7a2f-bfbc-900e64d5a2b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfContractsDomain_01a0b518-ba22-7a2f-bfbc-900e64d5a2b1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfContractsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfContractsAxis_01a0b518-ba22-7a2f-bfbc-900e64d5a2b1" xlink:to="loc_ifrs-full_TypesOfContractsDomain_01a0b518-ba22-7a2f-bfbc-900e64d5a2b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfContractsDomain_01a0b518-ba22-76be-9875-464bfedf505a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfContractsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfContractsAxis_01a0b518-ba22-7a2f-bfbc-900e64d5a2b1" xlink:to="loc_ifrs-full_TypesOfContractsDomain_01a0b518-ba22-76be-9875-464bfedf505a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b544-9641-7bf5-9406-673a8774783f" xlink:href="ipx-20260630.xsd#ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfContractsDomain_01a0b518-ba22-76be-9875-464bfedf505a" xlink:to="loc_ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b544-9641-7bf5-9406-673a8774783f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DefenseProductionActDPAFundingProgramMember_01a0b518-ba22-7c3f-aeeb-5cbd26cbe641" xlink:href="ipx-20260630.xsd#ipx_DefenseProductionActDPAFundingProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b544-9641-7bf5-9406-673a8774783f" xlink:to="loc_ipx_DefenseProductionActDPAFundingProgramMember_01a0b518-ba22-7c3f-aeeb-5cbd26cbe641" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_U.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b52e-8f98-7767-8118-a54baf33051f" xlink:href="ipx-20260630.xsd#ipx_U.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b544-9641-7bf5-9406-673a8774783f" xlink:to="loc_ipx_U.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b52e-8f98-7767-8118-a54baf33051f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember_01a0b533-1902-7ef7-8a6a-f2180ddc58c5" xlink:href="ipx-20260630.xsd#ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfContractsDomain_01a0b518-ba22-76be-9875-464bfedf505a" xlink:to="loc_ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember_01a0b533-1902-7ef7-8a6a-f2180ddc58c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SmallBusinessInnovationResearchSBIRFundingProgramTaskOrder2Member_01a0b533-85e9-7375-84b0-ba01afdfb7d4" xlink:href="ipx-20260630.xsd#ipx_SmallBusinessInnovationResearchSBIRFundingProgramTaskOrder2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember_01a0b533-1902-7ef7-8a6a-f2180ddc58c5" xlink:to="loc_ipx_SmallBusinessInnovationResearchSBIRFundingProgramTaskOrder2Member_01a0b533-85e9-7375-84b0-ba01afdfb7d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_U.S.GovernmentOtherAwardsMember_01a0b538-6a19-7893-99d5-2eb50ddf6105" xlink:href="ipx-20260630.xsd#ipx_U.S.GovernmentOtherAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfContractsDomain_01a0b518-ba22-76be-9875-464bfedf505a" xlink:to="loc_ipx_U.S.GovernmentOtherAwardsMember_01a0b538-6a19-7893-99d5-2eb50ddf6105" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents_01a0b516-d535-7f46-bb81-b03ee5e0ac54" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ifrs-full_CashAndCashEquivalents_01a0b516-d535-7f46-bb81-b03ee5e0ac54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetAssetsLiabilities_01a0b516-d535-75bf-869b-aa23fa2ff432" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetAssetsLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ifrs-full_NetAssetsLiabilities_01a0b516-d535-75bf-869b-aa23fa2ff432" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_CashFlowsFromUsedInInvestingAndOperatingActivities_01a0b516-d535-7506-bd63-36a5badb4505" xlink:href="ipx-20260630.xsd#ipx_CashFlowsFromUsedInInvestingAndOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_CashFlowsFromUsedInInvestingAndOperatingActivities_01a0b516-d535-7506-bd63-36a5badb4505" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SaleOfStockNumberOfSharesAuthorizedInTransaction_01a0b516-d535-7358-af20-a4aa0d6c7d33" xlink:href="ipx-20260630.xsd#ipx_SaleOfStockNumberOfSharesAuthorizedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_SaleOfStockNumberOfSharesAuthorizedInTransaction_01a0b516-d535-7358-af20-a4aa0d6c7d33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SaleOfStockDepositarySharesEquivalentOrdinaryShares_01a0b516-d535-72f8-8dc0-a41d8c123744" xlink:href="ipx-20260630.xsd#ipx_SaleOfStockDepositarySharesEquivalentOrdinaryShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_SaleOfStockDepositarySharesEquivalentOrdinaryShares_01a0b516-d535-72f8-8dc0-a41d8c123744" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SaleOfStockGrossProceedsFromSaleOfOrdinaryShares_01a0b516-d535-7e25-beae-1e60d9bf0bb2" xlink:href="ipx-20260630.xsd#ipx_SaleOfStockGrossProceedsFromSaleOfOrdinaryShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_SaleOfStockGrossProceedsFromSaleOfOrdinaryShares_01a0b516-d535-7e25-beae-1e60d9bf0bb2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GovernmentGrants_01a0b518-ba22-7777-bae6-355f5186ccd6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GovernmentGrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ifrs-full_GovernmentGrants_01a0b518-ba22-7777-bae6-355f5186ccd6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsCapacityScaleUpNonmonetaryAmount_01a0b52e-8f98-702e-865f-a04a7db3061f" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsCapacityScaleUpNonmonetaryAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_GovernmentGrantsCapacityScaleUpNonmonetaryAmount_01a0b52e-8f98-702e-865f-a04a7db3061f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsReimbursements_01a0b52e-8f98-7281-8420-563f9bdbfb1b" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsReimbursements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_GovernmentGrantsReimbursements_01a0b52e-8f98-7281-8420-563f9bdbfb1b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsRemainingAvailableAmount_01a0b52e-8f98-7463-8f84-91c8b6429463" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsRemainingAvailableAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_GovernmentGrantsRemainingAvailableAmount_01a0b52e-8f98-7463-8f84-91c8b6429463" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsBaseValue_01a0b535-4db5-74f4-88f7-d58d9a0bd28e" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsBaseValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_GovernmentGrantsBaseValue_01a0b535-4db5-74f4-88f7-d58d9a0bd28e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsFundedAmount_01a0b535-4db5-7d83-b18b-be1666da56ff" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsFundedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_GovernmentGrantsFundedAmount_01a0b535-4db5-7d83-b18b-be1666da56ff" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsFundedAmountAdditionalOption_01a0b535-4db5-7919-bba2-32df0c2f00cf" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsFundedAmountAdditionalOption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_GovernmentGrantsFundedAmountAdditionalOption_01a0b535-4db5-7919-bba2-32df0c2f00cf" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsTitaniumAlloyScrapMetalTransferredNonmonetaryAmount_01a0b539-c307-74bc-ad48-fa7eca88ab0c" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsTitaniumAlloyScrapMetalTransferredNonmonetaryAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_GovernmentGrantsTitaniumAlloyScrapMetalTransferredNonmonetaryAmount_01a0b539-c307-74bc-ad48-fa7eca88ab0c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsFullOperatingCapacityNonmonetaryAmount_01a0b539-c307-7631-810e-2222e36b5362" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsFullOperatingCapacityNonmonetaryAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_GovernmentGrantsFullOperatingCapacityNonmonetaryAmount_01a0b539-c307-7631-810e-2222e36b5362" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsCumulativeEquityCapitalRaised_01a0b53c-53c0-72da-ae41-ed8cfca52dd9" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsCumulativeEquityCapitalRaised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_01a0b516-a9f9-7f12-b12b-d72e6f36c7c2" xlink:to="loc_ipx_GovernmentGrantsCumulativeEquityCapitalRaised_01a0b53c-53c0-72da-ae41-ed8cfca52dd9" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/STATEMENTOFMATERIALACCOUNTINGPOLICIESPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#STATEMENTOFMATERIALACCOUNTINGPOLICIESPropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/STATEMENTOFMATERIALACCOUNTINGPOLICIESPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a0b545-bb6a-714a-98ba-db5c59903738" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_01a0b545-bb6a-7c1d-883c-aef2a037913a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a0b545-bb6a-714a-98ba-db5c59903738" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_01a0b545-bb6a-7c1d-883c-aef2a037913a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a0b545-bb6a-7823-8e62-75e95cd83de9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_01a0b545-bb6a-7c1d-883c-aef2a037913a" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a0b545-bb6a-7823-8e62-75e95cd83de9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a0b545-bb6a-7823-8e62-75e95cd83de9_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a0b545-bb6a-7823-8e62-75e95cd83de9" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a0b545-bb6a-7823-8e62-75e95cd83de9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a0b545-bb6a-794b-baa0-1cf7f15819af" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a0b545-bb6a-7823-8e62-75e95cd83de9" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a0b545-bb6a-794b-baa0-1cf7f15819af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PlantAndEquipmentMember_01a0b545-bb6a-7df2-a0d7-c4b31988288a" xlink:href="ipx-20260630.xsd#ipx_PlantAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a0b545-bb6a-794b-baa0-1cf7f15819af" xlink:to="loc_ipx_PlantAndEquipmentMember_01a0b545-bb6a-7df2-a0d7-c4b31988288a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_BuildingsAndLeaseholdImprovementsMember_01a0b545-bb6a-76e6-94dc-94a87dbaabcc" xlink:href="ipx-20260630.xsd#ipx_BuildingsAndLeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a0b545-bb6a-794b-baa0-1cf7f15819af" xlink:to="loc_ipx_BuildingsAndLeaseholdImprovementsMember_01a0b545-bb6a-76e6-94dc-94a87dbaabcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_01a0b545-bb6a-79b1-a15d-3273d24c7584" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_01a0b545-bb6a-7c1d-883c-aef2a037913a" xlink:to="loc_ifrs-full_RangeAxis_01a0b545-bb6a-79b1-a15d-3273d24c7584" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a0b545-bb6a-79b1-a15d-3273d24c7584_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_01a0b545-bb6a-79b1-a15d-3273d24c7584" xlink:to="loc_ifrs-full_RangeDomain_01a0b545-bb6a-79b1-a15d-3273d24c7584_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a0b545-bb6a-7016-9c9f-48573e3cc256" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_01a0b545-bb6a-79b1-a15d-3273d24c7584" xlink:to="loc_ifrs-full_RangeDomain_01a0b545-bb6a-7016-9c9f-48573e3cc256" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember_01a0b545-bb6a-72d2-8bea-7e07f1ce50f4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_01a0b545-bb6a-7016-9c9f-48573e3cc256" xlink:to="loc_ifrs-full_BottomOfRangeMember_01a0b545-bb6a-72d2-8bea-7e07f1ce50f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember_01a0b545-bb6a-71cf-aa6a-d55e0d3a1203" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_01a0b545-bb6a-7016-9c9f-48573e3cc256" xlink:to="loc_ifrs-full_TopOfRangeMember_01a0b545-bb6a-71cf-aa6a-d55e0d3a1203" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment_01a0b545-bb6a-7a8b-9625-001794827fbe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a0b545-bb6a-714a-98ba-db5c59903738" xlink:to="loc_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment_01a0b545-bb6a-7a8b-9625-001794827fbe" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/STATEMENTOFMATERIALACCOUNTINGPOLICIESIntangibleAssetsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#STATEMENTOFMATERIALACCOUNTINGPOLICIESIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/STATEMENTOFMATERIALACCOUNTINGPOLICIESIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_01a0b546-5347-7888-90e8-f264c73e33d8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_01a0b546-5347-7036-afd3-0a110ad254be" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_01a0b546-5347-7888-90e8-f264c73e33d8" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_01a0b546-5347-7036-afd3-0a110ad254be" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_01a0b546-5347-7f8a-aa80-07ae2635a4ad" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_01a0b546-5347-7036-afd3-0a110ad254be" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_01a0b546-5347-7f8a-aa80-07ae2635a4ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0b546-5347-7f8a-aa80-07ae2635a4ad_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_01a0b546-5347-7f8a-aa80-07ae2635a4ad" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0b546-5347-7f8a-aa80-07ae2635a4ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0b546-5347-7629-baea-cd3cfe836e26" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_01a0b546-5347-7f8a-aa80-07ae2635a4ad" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0b546-5347-7629-baea-cd3cfe836e26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember_01a0b546-5347-747d-b76f-ff54866483f1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0b546-5347-7629-baea-cd3cfe836e26" xlink:to="loc_ifrs-full_CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember_01a0b546-5347-747d-b76f-ff54866483f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_01a0b546-5347-720d-bf99-8903af0539f0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_01a0b546-5347-7036-afd3-0a110ad254be" xlink:to="loc_ifrs-full_RangeAxis_01a0b546-5347-720d-bf99-8903af0539f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a0b546-5347-720d-bf99-8903af0539f0_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_01a0b546-5347-720d-bf99-8903af0539f0" xlink:to="loc_ifrs-full_RangeDomain_01a0b546-5347-720d-bf99-8903af0539f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a0b546-5347-7537-baaa-097000517fc4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_01a0b546-5347-720d-bf99-8903af0539f0" xlink:to="loc_ifrs-full_RangeDomain_01a0b546-5347-7537-baaa-097000517fc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember_01a0b546-5347-7e9c-b1b8-652de7b43020" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_01a0b546-5347-7537-baaa-097000517fc4" xlink:to="loc_ifrs-full_BottomOfRangeMember_01a0b546-5347-7e9c-b1b8-652de7b43020" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember_01a0b546-5347-7a6c-a33b-ce22952bcc22" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_01a0b546-5347-7537-baaa-097000517fc4" xlink:to="loc_ifrs-full_TopOfRangeMember_01a0b546-5347-7a6c-a33b-ce22952bcc22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageMember_01a0b546-5347-7449-842e-b962db7728ca" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_01a0b546-5347-7537-baaa-097000517fc4" xlink:to="loc_ifrs-full_WeightedAverageMember_01a0b546-5347-7449-842e-b962db7728ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_01a0b546-5347-7791-a4a0-cdbd43a8f2a2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_01a0b546-5347-7888-90e8-f264c73e33d8" xlink:to="loc_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_01a0b546-5347-7791-a4a0-cdbd43a8f2a2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/STATEMENTOFMATERIALACCOUNTINGPOLICIESAccountingforGovernmentFundingArrangementsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#STATEMENTOFMATERIALACCOUNTINGPOLICIESAccountingforGovernmentFundingArrangementsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/STATEMENTOFMATERIALACCOUNTINGPOLICIESAccountingforGovernmentFundingArrangementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:href="ipx-20260630.xsd#ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsTable_01a0b548-5eb7-7782-8569-273782f36cc2" xlink:href="ipx-20260630.xsd#ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsTable_01a0b548-5eb7-7782-8569-273782f36cc2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfContractsAxis_01a0b548-5eb7-77f7-8948-f1e32c1390a9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfContractsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsTable_01a0b548-5eb7-7782-8569-273782f36cc2" xlink:to="loc_ifrs-full_TypesOfContractsAxis_01a0b548-5eb7-77f7-8948-f1e32c1390a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfContractsDomain_01a0b548-5eb7-77f7-8948-f1e32c1390a9_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfContractsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfContractsAxis_01a0b548-5eb7-77f7-8948-f1e32c1390a9" xlink:to="loc_ifrs-full_TypesOfContractsDomain_01a0b548-5eb7-77f7-8948-f1e32c1390a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfContractsDomain_01a0b548-eea9-7168-97d1-4684bf873dfc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfContractsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfContractsAxis_01a0b548-5eb7-77f7-8948-f1e32c1390a9" xlink:to="loc_ifrs-full_TypesOfContractsDomain_01a0b548-eea9-7168-97d1-4684bf873dfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b54c-8225-78ec-ad60-68bbc693917b" xlink:href="ipx-20260630.xsd#ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfContractsDomain_01a0b548-eea9-7168-97d1-4684bf873dfc" xlink:to="loc_ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b54c-8225-78ec-ad60-68bbc693917b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DefenseProductionActDPAFundingProgramMember_01a0b548-5eb7-77ef-953c-78ff0bec1782" xlink:href="ipx-20260630.xsd#ipx_DefenseProductionActDPAFundingProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b54c-8225-78ec-ad60-68bbc693917b" xlink:to="loc_ipx_DefenseProductionActDPAFundingProgramMember_01a0b548-5eb7-77ef-953c-78ff0bec1782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_U.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b548-5eb7-7e58-b680-df758f1f189b" xlink:href="ipx-20260630.xsd#ipx_U.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DefenseProductionActDPAFundingProgramAndU.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b54c-8225-78ec-ad60-68bbc693917b" xlink:to="loc_ipx_U.S.DoWIndustrialBaseAnalysisAndSustainmentGrantProgramIBASMember_01a0b548-5eb7-7e58-b680-df758f1f189b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember_01a0b548-5eb7-7001-b3fa-47faf823bf74" xlink:href="ipx-20260630.xsd#ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfContractsDomain_01a0b548-eea9-7168-97d1-4684bf873dfc" xlink:to="loc_ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember_01a0b548-5eb7-7001-b3fa-47faf823bf74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0b54b-ae5d-7af1-b4fc-4f512e4ae147" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsTable_01a0b548-5eb7-7782-8569-273782f36cc2" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0b54b-ae5d-7af1-b4fc-4f512e4ae147" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b54b-ae5d-7af1-b4fc-4f512e4ae147_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0b54b-ae5d-7af1-b4fc-4f512e4ae147" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b54b-ae5d-7af1-b4fc-4f512e4ae147_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b54b-ae5d-70f8-8816-c8fc9513743e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0b54b-ae5d-7af1-b4fc-4f512e4ae147" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b54b-ae5d-70f8-8816-c8fc9513743e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsMember_01a0b54b-ae5d-75ad-b7d5-10257a86b53f" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0b54b-ae5d-70f8-8816-c8fc9513743e" xlink:to="loc_ipx_GovernmentGrantsMember_01a0b54b-ae5d-75ad-b7d5-10257a86b53f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GovernmentGrants_01a0b548-5eb7-708e-984d-807c3fbc0e86" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GovernmentGrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ifrs-full_GovernmentGrants_01a0b548-5eb7-708e-984d-807c3fbc0e86" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsEntityMatch_01a0b548-eea9-7d01-88fb-d0b998f9c32b" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsEntityMatch"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsEntityMatch_01a0b548-eea9-7d01-88fb-d0b998f9c32b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsIncludingEntityMatch_01a0b548-eea9-72a9-9642-605b49ff62fc" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsIncludingEntityMatch"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsIncludingEntityMatch_01a0b548-eea9-72a9-9642-605b49ff62fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsTerm_01a0b548-eea9-79d8-85b3-a44bbbba3c9c" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsTerm_01a0b548-eea9-79d8-85b3-a44bbbba3c9c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsAssetProcurement_01a0b549-6d9c-755b-88a4-708ce6a8380e" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsAssetProcurement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsAssetProcurement_01a0b549-6d9c-755b-88a4-708ce6a8380e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsAssetProcurementInvoiced_01a0b549-6d9c-72dc-b3be-28640e53601e" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsAssetProcurementInvoiced"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsAssetProcurementInvoiced_01a0b549-6d9c-72dc-b3be-28640e53601e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsReimbursements_01a0b54a-2f5e-70e3-937c-49b35f797dc0" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsReimbursements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsReimbursements_01a0b54a-2f5e-70e3-937c-49b35f797dc0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsObligation_01a0b54c-341d-7d46-98ae-42f80334a95d" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsObligation_01a0b54c-341d-7d46-98ae-42f80334a95d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsEntityContribution_01a0b54c-341d-76a5-9613-c21e9346a6ed" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsEntityContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsEntityContribution_01a0b54c-341d-76a5-9613-c21e9346a6ed" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsCapacityScaleUpNonmonetaryAmount_01a0b54c-8225-77d1-9b0a-74746df7ef1f" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsCapacityScaleUpNonmonetaryAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsCapacityScaleUpNonmonetaryAmount_01a0b54c-8225-77d1-9b0a-74746df7ef1f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsIncurredCosts_01a0b550-d361-7ce4-9f6a-8b9d5555176c" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsIncurredCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsIncurredCosts_01a0b550-d361-7ce4-9f6a-8b9d5555176c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsIncurredCostsReimbursementsRequested_01a0b550-d361-776e-bab8-5e90e5d21c38" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsIncurredCostsReimbursementsRequested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsIncurredCostsReimbursementsRequested_01a0b550-d361-776e-bab8-5e90e5d21c38" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsRemainingAssetProcurement_01a0b554-0c83-7fbd-9489-bb0c25d9e89f" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsRemainingAssetProcurement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DisclosureOfDetailedInformationAboutGovernmentGrantsLineItems_01a0b548-5eb7-74fe-94a9-f965c79d9306" xlink:to="loc_ipx_GovernmentGrantsRemainingAssetProcurement_01a0b554-0c83-7fbd-9489-bb0c25d9e89f" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/INCOMETAXDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#INCOMETAXDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/INCOMETAXDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_019ceccc-681f-72b7-b673-6fb1a39521cb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_019ceccc-681f-7b7c-a5c3-e6b8a1c24377" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_019ceccc-681f-72b7-b673-6fb1a39521cb" xlink:to="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_019ceccc-681f-7b7c-a5c3-e6b8a1c24377" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_019ceccc-681f-7056-bfc9-5170bb30ac49" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_019ceccc-681f-7b7c-a5c3-e6b8a1c24377" xlink:to="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_019ceccc-681f-7056-bfc9-5170bb30ac49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-7056-bfc9-5170bb30ac49_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_019ceccc-681f-7056-bfc9-5170bb30ac49" xlink:to="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-7056-bfc9-5170bb30ac49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-709a-a865-f5315de2192a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_019ceccc-681f-7056-bfc9-5170bb30ac49" xlink:to="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-709a-a865-f5315de2192a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssetsMember_019ceccc-681f-711d-9ae7-57e0b3363ee2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RightofuseAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-709a-a865-f5315de2192a" xlink:to="loc_ifrs-full_RightofuseAssetsMember_019ceccc-681f-711d-9ae7-57e0b3363ee2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_UnusedTaxCreditsAccruedExpenditureMember_019ceccc-681f-70f1-b72f-15ec9aa4be88" xlink:href="ipx-20260630.xsd#ipx_UnusedTaxCreditsAccruedExpenditureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-709a-a865-f5315de2192a" xlink:to="loc_ipx_UnusedTaxCreditsAccruedExpenditureMember_019ceccc-681f-70f1-b72f-15ec9aa4be88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AllowanceForCreditLossesMember_019ceccc-681f-736b-b3a0-92778c07da12" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AllowanceForCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-709a-a865-f5315de2192a" xlink:to="loc_ifrs-full_AllowanceForCreditLossesMember_019ceccc-681f-736b-b3a0-92778c07da12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_UnusedTaxCreditsLeaseLiabilitiesMember_019ceccc-681f-742a-9ff6-37d94489e794" xlink:href="ipx-20260630.xsd#ipx_UnusedTaxCreditsLeaseLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-709a-a865-f5315de2192a" xlink:to="loc_ipx_UnusedTaxCreditsLeaseLiabilitiesMember_019ceccc-681f-742a-9ff6-37d94489e794" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_UnusedTaxCreditsCapitalAllowancesMember_019ceccc-681f-7b42-b085-d51c0d0fdc75" xlink:href="ipx-20260630.xsd#ipx_UnusedTaxCreditsCapitalAllowancesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-709a-a865-f5315de2192a" xlink:to="loc_ipx_UnusedTaxCreditsCapitalAllowancesMember_019ceccc-681f-7b42-b085-d51c0d0fdc75" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnusedTaxLossesMember_019ceccc-681f-7a18-944a-61319d6b0827" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnusedTaxLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_019ceccc-681f-709a-a865-f5315de2192a" xlink:to="loc_ifrs-full_UnusedTaxLossesMember_019ceccc-681f-7a18-944a-61319d6b0827" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilities_019ceccc-681f-7b66-acb1-a1b8419afb59" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_019ceccc-681f-72b7-b673-6fb1a39521cb" xlink:to="loc_ifrs-full_DeferredTaxLiabilities_019ceccc-681f-7b66-acb1-a1b8419afb59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DeferredTaxLiabilitiesOffsetAmount_019ceccc-681f-782b-a69c-3a9ef1c96961" xlink:href="ipx-20260630.xsd#ipx_DeferredTaxLiabilitiesOffsetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_019ceccc-681f-72b7-b673-6fb1a39521cb" xlink:to="loc_ipx_DeferredTaxLiabilitiesOffsetAmount_019ceccc-681f-782b-a69c-3a9ef1c96961" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetDeferredTaxLiabilities_019ceccc-681f-79e5-83c5-b013d62a5d9b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_019ceccc-681f-72b7-b673-6fb1a39521cb" xlink:to="loc_ifrs-full_NetDeferredTaxLiabilities_019ceccc-681f-79e5-83c5-b013d62a5d9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxAssets_019ceccc-681f-783c-a042-43bbe06aae8b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_019ceccc-681f-72b7-b673-6fb1a39521cb" xlink:to="loc_ifrs-full_DeferredTaxAssets_019ceccc-681f-783c-a042-43bbe06aae8b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DeferredTaxAssetsOffsetAmount_019ceccc-681f-7e00-8522-508b411c9d0a" xlink:href="ipx-20260630.xsd#ipx_DeferredTaxAssetsOffsetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_019ceccc-681f-72b7-b673-6fb1a39521cb" xlink:to="loc_ipx_DeferredTaxAssetsOffsetAmount_019ceccc-681f-7e00-8522-508b411c9d0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_OtherDeferredTaxAssetsUnused_019ceccc-681f-7669-8b8f-4b036a242fa7" xlink:href="ipx-20260630.xsd#ipx_OtherDeferredTaxAssetsUnused"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_019ceccc-681f-72b7-b673-6fb1a39521cb" xlink:to="loc_ipx_OtherDeferredTaxAssetsUnused_019ceccc-681f-7669-8b8f-4b036a242fa7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetDeferredTaxAssets_019ceccc-681f-74cd-93b9-8a7f69650525" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetDeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_019ceccc-681f-72b7-b673-6fb1a39521cb" xlink:to="loc_ifrs-full_NetDeferredTaxAssets_019ceccc-681f-74cd-93b9-8a7f69650525" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/PROPERTYPLANTANDEQUIPMENTDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#PROPERTYPLANTANDEQUIPMENTDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/PROPERTYPLANTANDEQUIPMENTDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019ceccc-681f-7688-aa69-61de02361dbb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_019ceccc-681f-7842-b081-9c286bb53cbf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019ceccc-681f-7688-aa69-61de02361dbb" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_019ceccc-681f-7842-b081-9c286bb53cbf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019ceccc-681f-7af3-8474-a7d54df36e5f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_019ceccc-681f-7842-b081-9c286bb53cbf" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019ceccc-681f-7af3-8474-a7d54df36e5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7af3-8474-a7d54df36e5f_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019ceccc-681f-7af3-8474-a7d54df36e5f" xlink:to="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7af3-8474-a7d54df36e5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7e0a-b539-342a0aad2e91" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019ceccc-681f-7af3-8474-a7d54df36e5f" xlink:to="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7e0a-b539-342a0aad2e91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_019ceccc-681f-7b7a-af97-501d3b8e60d1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7e0a-b539-342a0aad2e91" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_019ceccc-681f-7b7a-af97-501d3b8e60d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_019ceccc-681f-7b07-a7ea-4181562aa970" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7e0a-b539-342a0aad2e91" xlink:to="loc_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_019ceccc-681f-7b07-a7ea-4181562aa970" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsAxis_019ceccc-681f-7c12-b65f-0d5aecf27c78" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_019ceccc-681f-7842-b081-9c286bb53cbf" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsAxis_019ceccc-681f-7c12-b65f-0d5aecf27c78" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsDomain_019ceccc-681f-7c12-b65f-0d5aecf27c78_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsAxis_019ceccc-681f-7c12-b65f-0d5aecf27c78" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsDomain_019ceccc-681f-7c12-b65f-0d5aecf27c78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsDomain_019ceccc-681f-7fc5-ba63-d47b797b7036" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsAxis_019ceccc-681f-7c12-b65f-0d5aecf27c78" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsDomain_019ceccc-681f-7fc5-ba63-d47b797b7036" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember_019ceccc-681f-72cb-8a60-be0b509d906b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsDomain_019ceccc-681f-7fc5-ba63-d47b797b7036" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentMember_019ceccc-681f-72cb-8a60-be0b509d906b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssetsMember_019ceccc-681f-7235-a156-d350065b7d29" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RightofuseAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssetsDomain_019ceccc-681f-7fc5-ba63-d47b797b7036" xlink:to="loc_ifrs-full_RightofuseAssetsMember_019ceccc-681f-7235-a156-d350065b7d29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019ceccc-681f-751c-acae-3558526d2dcc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019ceccc-681f-7688-aa69-61de02361dbb" xlink:to="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019ceccc-681f-751c-acae-3558526d2dcc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets_019ceccc-681f-77e9-a1f2-acac1a357713" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019ceccc-681f-751c-acae-3558526d2dcc" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets_019ceccc-681f-77e9-a1f2-acac1a357713" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipmentIncludingRightofuseAssets_019ceccc-681f-7ce1-be15-65b01618fc5b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipmentIncludingRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019ceccc-681f-751c-acae-3558526d2dcc" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipmentIncludingRightofuseAssets_019ceccc-681f-7ce1-be15-65b01618fc5b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalsPropertyPlantAndEquipmentIncludingRightofuseAssets_019ceccc-681f-7e86-8b1b-c35beb2c13b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalsPropertyPlantAndEquipmentIncludingRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019ceccc-681f-751c-acae-3558526d2dcc" xlink:to="loc_ifrs-full_DisposalsPropertyPlantAndEquipmentIncludingRightofuseAssets_019ceccc-681f-7e86-8b1b-c35beb2c13b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipmentIncludingRightofuseAssets_01a09ef4-1343-705d-9879-cf60de1b0b62" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipmentIncludingRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019ceccc-681f-751c-acae-3558526d2dcc" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipmentIncludingRightofuseAssets_01a09ef4-1343-705d-9879-cf60de1b0b62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationPropertyPlantAndEquipmentIncludingRightofuseAssets_019ceccc-681f-7773-8a31-12632b055958" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationPropertyPlantAndEquipmentIncludingRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019ceccc-681f-751c-acae-3558526d2dcc" xlink:to="loc_ifrs-full_DepreciationPropertyPlantAndEquipmentIncludingRightofuseAssets_019ceccc-681f-7773-8a31-12632b055958" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets_019ceccc-681f-70de-8ccd-da48bf96d6ac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_01a0c990-a431-7fe6-a4d0-ec9c53c97182" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019ceccc-681f-7688-aa69-61de02361dbb" xlink:to="loc_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_01a0c990-a431-7fe6-a4d0-ec9c53c97182" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment_01a0cda5-2d35-7a81-95d3-e0e602cedcde" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019ceccc-681f-7688-aa69-61de02361dbb" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment_01a0cda5-2d35-7a81-95d3-e0e602cedcde" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/INTANGIBLESScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#INTANGIBLESScheduleofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/INTANGIBLESScheduleofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019ceccc-681f-7007-8640-9ab89dbb5074" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019ceccc-681f-7787-89b5-b4c5496a3ec9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019ceccc-681f-7007-8640-9ab89dbb5074" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019ceccc-681f-7787-89b5-b4c5496a3ec9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_019ceccc-681f-7316-a624-0eebe444d0e8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019ceccc-681f-7787-89b5-b4c5496a3ec9" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_019ceccc-681f-7316-a624-0eebe444d0e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_019ceccc-681f-7316-a624-0eebe444d0e8_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_019ceccc-681f-7316-a624-0eebe444d0e8" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_019ceccc-681f-7316-a624-0eebe444d0e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_019ceccc-681f-7789-b0c0-69a6eef1f447" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_019ceccc-681f-7316-a624-0eebe444d0e8" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_019ceccc-681f-7789-b0c0-69a6eef1f447" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember_019ceccc-681f-7965-9fc6-5c0b09f8f2e4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_019ceccc-681f-7789-b0c0-69a6eef1f447" xlink:to="loc_ifrs-full_CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember_019ceccc-681f-7965-9fc6-5c0b09f8f2e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019ceccc-681f-7667-864b-b757b03a8ff4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019ceccc-681f-7787-89b5-b4c5496a3ec9" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019ceccc-681f-7667-864b-b757b03a8ff4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7667-864b-b757b03a8ff4_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019ceccc-681f-7667-864b-b757b03a8ff4" xlink:to="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7667-864b-b757b03a8ff4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7ff8-9c95-b19760f14e9f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019ceccc-681f-7667-864b-b757b03a8ff4" xlink:to="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7ff8-9c95-b19760f14e9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_019ceccc-681f-71d8-b9f1-9ff5dd0213b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7ff8-9c95-b19760f14e9f" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_019ceccc-681f-71d8-b9f1-9ff5dd0213b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_019ceccc-681f-7e9a-858d-013a9d53a8f8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_019ceccc-681f-7ff8-9c95-b19760f14e9f" xlink:to="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_019ceccc-681f-7e9a-858d-013a9d53a8f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019ceccc-681f-78a3-ae50-e67ea3a712cb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019ceccc-681f-7007-8640-9ab89dbb5074" xlink:to="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019ceccc-681f-78a3-ae50-e67ea3a712cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019ceccc-681f-7c28-9282-fe4966dafd9b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019ceccc-681f-78a3-ae50-e67ea3a712cb" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019ceccc-681f-7c28-9282-fe4966dafd9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersIntangibleAssetsAndGoodwill_019ceccc-681f-7790-b173-e9b2f5b877da" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransfersIntangibleAssetsAndGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019ceccc-681f-78a3-ae50-e67ea3a712cb" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersIntangibleAssetsAndGoodwill_019ceccc-681f-7790-b173-e9b2f5b877da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_019ceccc-681f-79cd-a3a6-6683ccc0bf24" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019ceccc-681f-78a3-ae50-e67ea3a712cb" xlink:to="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_019ceccc-681f-79cd-a3a6-6683ccc0bf24" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_019ceccc-681f-7260-bc2b-901ba36f8a84" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019ceccc-681f-78a3-ae50-e67ea3a712cb" xlink:to="loc_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_019ceccc-681f-7260-bc2b-901ba36f8a84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019ceccc-681f-7e64-bb45-595f3743223a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/INTANGIBLESNarrativeDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#INTANGIBLESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/INTANGIBLESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_01a0d328-a992-7737-8cfa-c50fa03039b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_01a0d328-a992-7554-843b-283b2bfb0441" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_01a0d328-a992-7737-8cfa-c50fa03039b3" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_01a0d328-a992-7554-843b-283b2bfb0441" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_01a0d328-a992-7ca2-8c55-0623faf8a876" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_01a0d328-a992-7554-843b-283b2bfb0441" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_01a0d328-a992-7ca2-8c55-0623faf8a876" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0d328-a992-7ca2-8c55-0623faf8a876_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_01a0d328-a992-7ca2-8c55-0623faf8a876" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0d328-a992-7ca2-8c55-0623faf8a876_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0d328-a992-75e0-b899-42af2aeb24bd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_01a0d328-a992-7ca2-8c55-0623faf8a876" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0d328-a992-75e0-b899-42af2aeb24bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember_01a0d328-a992-7074-ae42-8fbf45bcdbf4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_01a0d328-a992-75e0-b899-42af2aeb24bd" xlink:to="loc_ifrs-full_CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember_01a0d328-a992-7074-ae42-8fbf45bcdbf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CounterpartiesAxis_01a0d328-a992-79c9-a592-9afb8cf59eed" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CounterpartiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_01a0d328-a992-7554-843b-283b2bfb0441" xlink:to="loc_ifrs-full_CounterpartiesAxis_01a0d328-a992-79c9-a592-9afb8cf59eed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CounterpartiesDomain_01a0d328-a992-79c9-a592-9afb8cf59eed_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CounterpartiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CounterpartiesAxis_01a0d328-a992-79c9-a592-9afb8cf59eed" xlink:to="loc_ifrs-full_CounterpartiesDomain_01a0d328-a992-79c9-a592-9afb8cf59eed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CounterpartiesDomain_01a0d328-a992-708d-a7c4-1882a77da794" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CounterpartiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CounterpartiesAxis_01a0d328-a992-79c9-a592-9afb8cf59eed" xlink:to="loc_ifrs-full_CounterpartiesDomain_01a0d328-a992-708d-a7c4-1882a77da794" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_BlacksandTechnologyLLCMember_01a0d328-a992-7318-bc03-b7348ddf5bec" xlink:href="ipx-20260630.xsd#ipx_BlacksandTechnologyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CounterpartiesDomain_01a0d328-a992-708d-a7c4-1882a77da794" xlink:to="loc_ipx_BlacksandTechnologyLLCMember_01a0d328-a992-7318-bc03-b7348ddf5bec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IntangibleAssetsOtherThanGoodwillHeldByEntity_01a0d328-a992-7bcf-81fe-aadf7f34b835" xlink:href="ipx-20260630.xsd#ipx_IntangibleAssetsOtherThanGoodwillHeldByEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_01a0d328-a992-7737-8cfa-c50fa03039b3" xlink:to="loc_ipx_IntangibleAssetsOtherThanGoodwillHeldByEntity_01a0d328-a992-7bcf-81fe-aadf7f34b835" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/EXPLORATIONANDEVALUATIONASSETSDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#EXPLORATIONANDEVALUATIONASSETSDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/EXPLORATIONANDEVALUATIONASSETSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-681f-796f-ae86-66b0c0429e40" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInvestmentPropertyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInvestmentPropertyTable_019ceccc-681f-7e1c-912a-0979b514024e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInvestmentPropertyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-681f-796f-ae86-66b0c0429e40" xlink:to="loc_ifrs-full_DisclosureOfInvestmentPropertyTable_019ceccc-681f-7e1c-912a-0979b514024e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-681f-78f1-ae8a-a05ad232b0a1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInvestmentPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyTable_019ceccc-681f-7e1c-912a-0979b514024e" xlink:to="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-681f-78f1-ae8a-a05ad232b0a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-681f-78f1-ae8a-a05ad232b0a1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInvestmentPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-681f-78f1-ae8a-a05ad232b0a1" xlink:to="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-681f-78f1-ae8a-a05ad232b0a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-681f-70b9-9e3b-fb1c5540c47a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInvestmentPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-681f-78f1-ae8a-a05ad232b0a1" xlink:to="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-681f-70b9-9e3b-fb1c5540c47a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_TitanProjectMember_019ceccc-681f-7f3a-80fc-f012b4f440f9" xlink:href="ipx-20260630.xsd#ipx_TitanProjectMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-681f-70b9-9e3b-fb1c5540c47a" xlink:to="loc_ipx_TitanProjectMember_019ceccc-681f-7f3a-80fc-f012b4f440f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ExplorationAndEvaluationAssetsRollForward_019ceccc-681f-70b9-b84d-9669ab711aab" xlink:href="ipx-20260630.xsd#ipx_ExplorationAndEvaluationAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-681f-796f-ae86-66b0c0429e40" xlink:to="loc_ipx_ExplorationAndEvaluationAssetsRollForward_019ceccc-681f-70b9-b84d-9669ab711aab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsArisingFromExplorationForAndEvaluationOfMineralResources_019ceccc-6820-7c89-a6bb-d947c0aa7ca6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsArisingFromExplorationForAndEvaluationOfMineralResources"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_ExplorationAndEvaluationAssetsRollForward_019ceccc-681f-70b9-b84d-9669ab711aab" xlink:to="loc_ifrs-full_AssetsArisingFromExplorationForAndEvaluationOfMineralResources_019ceccc-6820-7c89-a6bb-d947c0aa7ca6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AdditionsOtherThanThroughBusinessCombinationsExplorationForAndEvaluationOfMineralResources_019ceccc-6820-7d4c-872c-50c1ab240e89" xlink:href="ipx-20260630.xsd#ipx_AdditionsOtherThanThroughBusinessCombinationsExplorationForAndEvaluationOfMineralResources"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_ExplorationAndEvaluationAssetsRollForward_019ceccc-681f-70b9-b84d-9669ab711aab" xlink:to="loc_ipx_AdditionsOtherThanThroughBusinessCombinationsExplorationForAndEvaluationOfMineralResources_019ceccc-6820-7d4c-872c-50c1ab240e89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_WriteOffsOtherThanThroughBusinessCombinationsExplorationForAndEvaluationOfMineralResources_019ceccc-6820-7a4f-9225-4adf6df8bdfa" xlink:href="ipx-20260630.xsd#ipx_WriteOffsOtherThanThroughBusinessCombinationsExplorationForAndEvaluationOfMineralResources"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_ExplorationAndEvaluationAssetsRollForward_019ceccc-681f-70b9-b84d-9669ab711aab" xlink:to="loc_ipx_WriteOffsOtherThanThroughBusinessCombinationsExplorationForAndEvaluationOfMineralResources_019ceccc-6820-7a4f-9225-4adf6df8bdfa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsArisingFromExplorationForAndEvaluationOfMineralResources_019ceccc-6820-7541-8525-c74d08767025" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsArisingFromExplorationForAndEvaluationOfMineralResources"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLand_019ceccc-6820-78bd-b5db-1827b295703e" xlink:href="ipx-20260630.xsd#ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLand"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-681f-796f-ae86-66b0c0429e40" xlink:to="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLand_019ceccc-6820-78bd-b5db-1827b295703e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandOwned_019ceccc-6820-7ab9-8af2-661934d4fdbb" xlink:href="ipx-20260630.xsd#ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandOwned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-681f-796f-ae86-66b0c0429e40" xlink:to="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandOwned_019ceccc-6820-7ab9-8af2-661934d4fdbb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToLongTermLease_019ceccc-6820-7f6b-91f6-f55c72846bb6" xlink:href="ipx-20260630.xsd#ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToLongTermLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-681f-796f-ae86-66b0c0429e40" xlink:to="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToLongTermLease_019ceccc-6820-7f6b-91f6-f55c72846bb6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToExclusiveOptionAgreements_019ceccc-6820-7e47-bf46-e4aebb0fe495" xlink:href="ipx-20260630.xsd#ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToExclusiveOptionAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-681f-796f-ae86-66b0c0429e40" xlink:to="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToExclusiveOptionAgreements_019ceccc-6820-7e47-bf46-e4aebb0fe495" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/LOANSANDBORROWINGSScheduleofLoansandBorrowingsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#LOANSANDBORROWINGSScheduleofLoansandBorrowingsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/LOANSANDBORROWINGSScheduleofLoansandBorrowingsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019ceccc-6820-78f2-bee7-e56d497e2e8f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019ceccc-6820-7255-8bcb-a594675ccacd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019ceccc-6820-78f2-bee7-e56d497e2e8f" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019ceccc-6820-7255-8bcb-a594675ccacd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_019ceccc-6820-71cf-b7a8-146e9e9ec539" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019ceccc-6820-7255-8bcb-a594675ccacd" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_019ceccc-6820-71cf-b7a8-146e9e9ec539" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019ceccc-6820-71cf-b7a8-146e9e9ec539_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019ceccc-6820-71cf-b7a8-146e9e9ec539" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019ceccc-6820-71cf-b7a8-146e9e9ec539_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019ceccc-6820-7960-bb4a-e483504e89ee" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019ceccc-6820-71cf-b7a8-146e9e9ec539" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019ceccc-6820-7960-bb4a-e483504e89ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_OtherLoansAndBorrowingsMember_019ceccc-6820-70e6-9c3a-f8e6bc4af399" xlink:href="ipx-20260630.xsd#ipx_OtherLoansAndBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019ceccc-6820-7960-bb4a-e483504e89ee" xlink:to="loc_ipx_OtherLoansAndBorrowingsMember_019ceccc-6820-70e6-9c3a-f8e6bc4af399" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember_019ceccc-6820-7c40-ba0d-8902a22aacb0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019ceccc-6820-7960-bb4a-e483504e89ee" xlink:to="loc_ifrs-full_LeaseLiabilitiesMember_019ceccc-6820-7c40-ba0d-8902a22aacb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ReconciliationOfChangeInBorrowingsAbstract_019ceccc-6820-7f8b-9205-0ab83097cd7a" xlink:href="ipx-20260630.xsd#ipx_ReconciliationOfChangeInBorrowingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019ceccc-6820-78f2-bee7-e56d497e2e8f" xlink:to="loc_ipx_ReconciliationOfChangeInBorrowingsAbstract_019ceccc-6820-7f8b-9205-0ab83097cd7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings_019ceccc-6820-7762-a08e-ff470d909293" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_ReconciliationOfChangeInBorrowingsAbstract_019ceccc-6820-7f8b-9205-0ab83097cd7a" xlink:to="loc_ifrs-full_Borrowings_019ceccc-6820-7762-a08e-ff470d909293" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_BorrowingsAdditions_019ceccc-6820-7e78-9065-6e86a7f39b0e" xlink:href="ipx-20260630.xsd#ipx_BorrowingsAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_ReconciliationOfChangeInBorrowingsAbstract_019ceccc-6820-7f8b-9205-0ab83097cd7a" xlink:to="loc_ipx_BorrowingsAdditions_019ceccc-6820-7e78-9065-6e86a7f39b0e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_BorrowingsRepayments_019ceccc-6820-7439-b0f3-c112a9e804e4" xlink:href="ipx-20260630.xsd#ipx_BorrowingsRepayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_ReconciliationOfChangeInBorrowingsAbstract_019ceccc-6820-7f8b-9205-0ab83097cd7a" xlink:to="loc_ipx_BorrowingsRepayments_019ceccc-6820-7439-b0f3-c112a9e804e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings_019ceccc-6820-739e-a4a8-83e60e2c1eb0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermBorrowings_019ceccc-6820-70aa-b495-7252a06f12c3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShorttermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019ceccc-6820-78f2-bee7-e56d497e2e8f" xlink:to="loc_ifrs-full_ShorttermBorrowings_019ceccc-6820-70aa-b495-7252a06f12c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowings_019ceccc-6820-7a87-8c7b-dcc09cc0e213" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019ceccc-6820-78f2-bee7-e56d497e2e8f" xlink:to="loc_ifrs-full_LongtermBorrowings_019ceccc-6820-7a87-8c7b-dcc09cc0e213" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/LOANSANDBORROWINGSScheduleofMaturityofLoansandBorrowingsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#LOANSANDBORROWINGSScheduleofMaturityofLoansandBorrowingsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/LOANSANDBORROWINGSScheduleofMaturityofLoansandBorrowingsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a0a528-a532-737a-9c15-4b38b94c3c6c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a0a528-a532-7b94-9a8d-e26f4c910bee" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a0a528-a532-737a-9c15-4b38b94c3c6c" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a0a528-a532-7b94-9a8d-e26f4c910bee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_01a0a528-a532-758c-9954-2f7125bdd5ed" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a0a528-a532-7b94-9a8d-e26f4c910bee" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_01a0a528-a532-758c-9954-2f7125bdd5ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_01a0a528-a532-758c-9954-2f7125bdd5ed_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_01a0a528-a532-758c-9954-2f7125bdd5ed" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_01a0a528-a532-758c-9954-2f7125bdd5ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_01a0a528-a532-77fa-96e6-57cd9726fe69" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_01a0a528-a532-758c-9954-2f7125bdd5ed" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_01a0a528-a532-77fa-96e6-57cd9726fe69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_OtherLoansAndBorrowingsMember_01a0a528-a532-70d8-9e4b-814bd0522c68" xlink:href="ipx-20260630.xsd#ipx_OtherLoansAndBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a0a528-a532-77fa-96e6-57cd9726fe69" xlink:to="loc_ipx_OtherLoansAndBorrowingsMember_01a0a528-a532-70d8-9e4b-814bd0522c68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember_01a0a528-a532-7008-b4b1-e3654db986b9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a0a528-a532-77fa-96e6-57cd9726fe69" xlink:to="loc_ifrs-full_LeaseLiabilitiesMember_01a0a528-a532-7008-b4b1-e3654db986b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis_01a0a528-a532-73a6-9113-42e5065306b9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a0a528-a532-7b94-9a8d-e26f4c910bee" xlink:to="loc_ifrs-full_MaturityAxis_01a0a528-a532-73a6-9113-42e5065306b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_01a0a528-a532-73a6-9113-42e5065306b9_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_01a0a528-a532-73a6-9113-42e5065306b9" xlink:to="loc_ifrs-full_MaturityDomain_01a0a528-a532-73a6-9113-42e5065306b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_01a0a528-a532-7878-95e3-cf04a8be26ff" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_01a0a528-a532-73a6-9113-42e5065306b9" xlink:to="loc_ifrs-full_MaturityDomain_01a0a528-a532-7878-95e3-cf04a8be26ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_01a0a528-a532-70fc-b5f6-78a26196b63a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotLaterThanOneYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a0a528-a532-7878-95e3-cf04a8be26ff" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_01a0a528-a532-70fc-b5f6-78a26196b63a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_01a0a528-a532-7949-a561-3e730440ff51" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a0a528-a532-7878-95e3-cf04a8be26ff" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_01a0a528-a532-7949-a561-3e730440ff51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_01a0a528-a532-7b0c-b72d-745f075598ce" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a0a528-a532-7878-95e3-cf04a8be26ff" xlink:to="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_01a0a528-a532-7b0c-b72d-745f075598ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_01a0a528-a532-7a98-830e-840b07de5848" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a0a528-a532-7878-95e3-cf04a8be26ff" xlink:to="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_01a0a528-a532-7a98-830e-840b07de5848" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_01a0d7c3-a0d5-7dae-b015-9501aa597dda" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a0a528-a532-7878-95e3-cf04a8be26ff" xlink:to="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_01a0d7c3-a0d5-7dae-b015-9501aa597dda" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember_01a0d7c3-8f84-7ab1-bed7-d7df2b5a05d7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFiveYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a0a528-a532-7878-95e3-cf04a8be26ff" xlink:to="loc_ifrs-full_LaterThanFiveYearsMember_01a0d7c3-8f84-7ab1-bed7-d7df2b5a05d7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a0a6c4-d60b-7c36-8e90-f502b7b95cc0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a0a528-a532-7b94-9a8d-e26f4c910bee" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a0a6c4-d60b-7c36-8e90-f502b7b95cc0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_01a0a6c4-d60b-7c36-8e90-f502b7b95cc0_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a0a6c4-d60b-7c36-8e90-f502b7b95cc0" xlink:to="loc_ifrs-full_CarryingAmountMember_01a0a6c4-d60b-7c36-8e90-f502b7b95cc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_01a0a6c4-d60b-794d-b212-6635cab23b56" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a0a6c4-d60b-7c36-8e90-f502b7b95cc0" xlink:to="loc_ifrs-full_CarryingAmountMember_01a0a6c4-d60b-794d-b212-6635cab23b56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_01a0a6c5-04c9-721c-a6bf-71c831921749" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_01a0a6c4-d60b-794d-b212-6635cab23b56" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_01a0a6c5-04c9-721c-a6bf-71c831921749" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ImputedInterestMember_01a0a6c5-3c6b-751a-9c4e-0eada667383d" xlink:href="ipx-20260630.xsd#ipx_ImputedInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_01a0a6c4-d60b-794d-b212-6635cab23b56" xlink:to="loc_ipx_ImputedInterestMember_01a0a6c5-3c6b-751a-9c4e-0eada667383d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings_01a0a528-a532-7654-9fcd-9975eef597a8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a0a528-a532-737a-9c15-4b38b94c3c6c" xlink:to="loc_ifrs-full_Borrowings_01a0a528-a532-7654-9fcd-9975eef597a8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/CONTRIBUTEDEQUITYScheduleofIssuedCapitalDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#CONTRIBUTEDEQUITYScheduleofIssuedCapitalDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/CONTRIBUTEDEQUITYScheduleofIssuedCapitalDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7c75-9cab-667d282dcbe4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-738a-b429-45eaa625d85d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7c75-9cab-667d282dcbe4" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-738a-b429-45eaa625d85d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-70b7-96cf-f1b65bffba1c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-738a-b429-45eaa625d85d" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-70b7-96cf-f1b65bffba1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-70b7-96cf-f1b65bffba1c_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-70b7-96cf-f1b65bffba1c" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-70b7-96cf-f1b65bffba1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7207-a227-f90a7456e876" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-70b7-96cf-f1b65bffba1c" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7207-a227-f90a7456e876" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_019ceccc-6820-7e2a-bd89-6ff9b3e81ed4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7207-a227-f90a7456e876" xlink:to="loc_ifrs-full_IssuedCapitalMember_019ceccc-6820-7e2a-bd89-6ff9b3e81ed4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019ceccc-6820-7a7b-90c4-b317db09b8d0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7c75-9cab-667d282dcbe4" xlink:to="loc_ifrs-full_Equity_019ceccc-6820-7a7b-90c4-b317db09b8d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_019ceccc-6820-788c-a4a3-527f562df9ad" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7c75-9cab-667d282dcbe4" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_019ceccc-6820-788c-a4a3-527f562df9ad" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/CONTRIBUTEDEQUITYScheduleofMovementsinIssuedCapitalDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#CONTRIBUTEDEQUITYScheduleofMovementsinIssuedCapitalDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/CONTRIBUTEDEQUITYScheduleofMovementsinIssuedCapitalDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-7e84-b879-7337dfd024bf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-7e84-b879-7337dfd024bf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_019ceccc-6820-7323-8637-0438d800bee6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-7e84-b879-7337dfd024bf" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_019ceccc-6820-7323-8637-0438d800bee6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-7323-8637-0438d800bee6_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_019ceccc-6820-7323-8637-0438d800bee6" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-7323-8637-0438d800bee6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-71c1-8de2-d3075a5b66c8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_019ceccc-6820-7323-8637-0438d800bee6" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-71c1-8de2-d3075a5b66c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ClassAPerformanceSharesMember_019ceccc-6820-7369-9594-888a41abee53" xlink:href="ipx-20260630.xsd#ipx_ClassAPerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-71c1-8de2-d3075a5b66c8" xlink:to="loc_ipx_ClassAPerformanceSharesMember_019ceccc-6820-7369-9594-888a41abee53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ClassBPerformanceSharesMember_019ceccc-6820-7aed-a3e2-93411d120459" xlink:href="ipx-20260630.xsd#ipx_ClassBPerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-71c1-8de2-d3075a5b66c8" xlink:to="loc_ipx_ClassBPerformanceSharesMember_019ceccc-6820-7aed-a3e2-93411d120459" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-7f8d-ac80-a8d0368b3bc2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-7e84-b879-7337dfd024bf" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-7f8d-ac80-a8d0368b3bc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7f8d-ac80-a8d0368b3bc2_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-7f8d-ac80-a8d0368b3bc2" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7f8d-ac80-a8d0368b3bc2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-77b3-a9ab-f385f3424002" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-7f8d-ac80-a8d0368b3bc2" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-77b3-a9ab-f385f3424002" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_019ceccc-6820-717b-b278-717508596f04" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-77b3-a9ab-f385f3424002" xlink:to="loc_ifrs-full_IssuedCapitalMember_019ceccc-6820-717b-b278-717508596f04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_019ceccc-6820-71ef-9e54-d58aefa44410" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_019ceccc-6820-71ef-9e54-d58aefa44410" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019ceccc-6820-793c-9ec4-f37b96659fbe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ifrs-full_Equity_019ceccc-6820-793c-9ec4-f37b96659fbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedThroughSharePlacements_019ceccc-6820-7443-9b43-2fdc89e599f9" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedThroughSharePlacements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_NumberOfSharesIssuedThroughSharePlacements_019ceccc-6820-7443-9b43-2fdc89e599f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughSharePlacementEquity_019ceccc-6820-71af-92db-4218f2171ed4" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughSharePlacementEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_IncreaseDecreaseThroughSharePlacementEquity_019ceccc-6820-71af-92db-4218f2171ed4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_019ceccc-6820-7f73-8ea8-af9c3d8185b4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_019ceccc-6820-7f73-8ea8-af9c3d8185b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_019ceccc-6820-7ea7-acda-927df8ca7f5c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_019ceccc-6820-7ea7-acda-927df8ca7f5c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedThroughConversionOfRestrictedShareUnits_019ceccc-6820-70cc-bbd3-e700e9e41921" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedThroughConversionOfRestrictedShareUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_NumberOfSharesIssuedThroughConversionOfRestrictedShareUnits_019ceccc-6820-70cc-bbd3-e700e9e41921" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughConversionOfRestrictedShareUnitsEquity_019ceccc-6820-7c96-9a79-eb6e7aede1b5" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughConversionOfRestrictedShareUnitsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_IncreaseDecreaseThroughConversionOfRestrictedShareUnitsEquity_019ceccc-6820-7c96-9a79-eb6e7aede1b5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedThroughConversionOfRights_019ceccc-6820-7587-97ef-bd4e981ce432" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedThroughConversionOfRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_NumberOfSharesIssuedThroughConversionOfRights_019ceccc-6820-7587-97ef-bd4e981ce432" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughConversionOfRightsEquity_019ceccc-6820-7170-b4b9-cee181f32345" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughConversionOfRightsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_IncreaseDecreaseThroughConversionOfRightsEquity_019ceccc-6820-7170-b4b9-cee181f32345" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedToConsultant_019ceccc-6820-7e6f-8369-9d9473b9a272" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedToConsultant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_NumberOfSharesIssuedToConsultant_019ceccc-6820-7e6f-8369-9d9473b9a272" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughSharesToConsultantsEquity_019ceccc-6820-723d-b958-b8a7faa853bc" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughSharesToConsultantsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_IncreaseDecreaseThroughSharesToConsultantsEquity_019ceccc-6820-723d-b958-b8a7faa853bc" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedToCounterparty_019ceccc-6820-711d-8d0d-7a53d5eca697" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedToCounterparty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_NumberOfSharesIssuedToCounterparty_019ceccc-6820-711d-8d0d-7a53d5eca697" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughSharesToCounterparty_019ceccc-6820-7974-b4f3-b93c64d461ea" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughSharesToCounterparty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_IncreaseDecreaseThroughSharesToCounterparty_019ceccc-6820-7974-b4f3-b93c64d461ea" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedToDirectorsInLieuOfCashBonus_019ceccc-6820-7b14-8cb5-70e9faafbbd3" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedToDirectorsInLieuOfCashBonus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_NumberOfSharesIssuedToDirectorsInLieuOfCashBonus_019ceccc-6820-7b14-8cb5-70e9faafbbd3" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughIssueOfDirectorSharesInLieuOfBonusEquity_019ceccc-6820-7dc0-83c3-16151005e19d" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughIssueOfDirectorSharesInLieuOfBonusEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_IncreaseDecreaseThroughIssueOfDirectorSharesInLieuOfBonusEquity_019ceccc-6820-7dc0-83c3-16151005e19d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedThroughPaymentOfExpenses_019ceccc-6820-79be-8a7e-54ca18b705f6" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedThroughPaymentOfExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_NumberOfSharesIssuedThroughPaymentOfExpenses_019ceccc-6820-79be-8a7e-54ca18b705f6" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughPaymentOfExpensesEquity_019ceccc-6820-7959-8c88-57d6932b34f6" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughPaymentOfExpensesEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_IncreaseDecreaseThroughPaymentOfExpensesEquity_019ceccc-6820-7959-8c88-57d6932b34f6" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedThroughConversionOfPerformanceShares_019ceccc-6820-7b28-ac10-fedc300a1e90" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedThroughConversionOfPerformanceShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ipx_NumberOfSharesIssuedThroughConversionOfPerformanceShares_019ceccc-6820-7b28-ac10-fedc300a1e90" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareIssueRelatedCost_019ceccc-6820-76d4-8677-a6ff052e915f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareIssueRelatedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-75cb-88a9-63e4de74c5b3" xlink:to="loc_ifrs-full_ShareIssueRelatedCost_019ceccc-6820-76d4-8677-a6ff052e915f" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_019ceccc-6820-73b2-b1fe-c888359d12dc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019ceccc-6820-7d3d-81d9-0e95e277891e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/CONTRIBUTEDEQUITYNarrativeDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#CONTRIBUTEDEQUITYNarrativeDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/CONTRIBUTEDEQUITYNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7a7b-801d-64abc9114441" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-7c6d-9ef3-01a25440be65" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7a7b-801d-64abc9114441" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-7c6d-9ef3-01a25440be65" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_019ceccc-6820-7475-9e46-82390d59a847" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-7c6d-9ef3-01a25440be65" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_019ceccc-6820-7475-9e46-82390d59a847" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-7475-9e46-82390d59a847_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_019ceccc-6820-7475-9e46-82390d59a847" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-7475-9e46-82390d59a847_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-7467-8f3a-ff816f0a8adb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_019ceccc-6820-7475-9e46-82390d59a847" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-7467-8f3a-ff816f0a8adb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ClassAPerformanceSharesMember_019ceccc-6820-7454-bb45-3d4784b560ff" xlink:href="ipx-20260630.xsd#ipx_ClassAPerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-7467-8f3a-ff816f0a8adb" xlink:to="loc_ipx_ClassAPerformanceSharesMember_019ceccc-6820-7454-bb45-3d4784b560ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ClassBPerformanceSharesMember_019ceccc-6820-7b83-96c4-ef06a87fba86" xlink:href="ipx-20260630.xsd#ipx_ClassBPerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019ceccc-6820-7467-8f3a-ff816f0a8adb" xlink:to="loc_ipx_ClassBPerformanceSharesMember_019ceccc-6820-7b83-96c4-ef06a87fba86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-7010-bd39-f4e32a04c967" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019ceccc-6820-7c6d-9ef3-01a25440be65" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-7010-bd39-f4e32a04c967" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7010-bd39-f4e32a04c967_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-7010-bd39-f4e32a04c967" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7010-bd39-f4e32a04c967_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7ee0-a187-ec4e88f4fdef" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019ceccc-6820-7010-bd39-f4e32a04c967" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7ee0-a187-ec4e88f4fdef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_019ceccc-6820-78db-a802-247d9d880385" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019ceccc-6820-7ee0-a187-ec4e88f4fdef" xlink:to="loc_ifrs-full_IssuedCapitalMember_019ceccc-6820-78db-a802-247d9d880385" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_019ceccc-6820-7803-aad4-7cfea48afb5c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7a7b-801d-64abc9114441" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_019ceccc-6820-7803-aad4-7cfea48afb5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ConversionOfConvertibleInstrumentsSharesConvertedIntoOrdinaryShares_019ceccc-6820-71ec-b109-acddb0276009" xlink:href="ipx-20260630.xsd#ipx_ConversionOfConvertibleInstrumentsSharesConvertedIntoOrdinaryShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7a7b-801d-64abc9114441" xlink:to="loc_ipx_ConversionOfConvertibleInstrumentsSharesConvertedIntoOrdinaryShares_019ceccc-6820-71ec-b109-acddb0276009" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceSharesConvertibleMinimumNetPresentValueRequirement_019ceccc-6820-7d2c-b965-956648d4eb19" xlink:href="ipx-20260630.xsd#ipx_PerformanceSharesConvertibleMinimumNetPresentValueRequirement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7a7b-801d-64abc9114441" xlink:to="loc_ipx_PerformanceSharesConvertibleMinimumNetPresentValueRequirement_019ceccc-6820-7d2c-b965-956648d4eb19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ConversionOfConvertibleInstrumentsOrdinarySharesCalledAfterExpiryDate_019ceccc-6820-7c42-8615-ed7755a6f179" xlink:href="ipx-20260630.xsd#ipx_ConversionOfConvertibleInstrumentsOrdinarySharesCalledAfterExpiryDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019ceccc-6820-7a7b-801d-64abc9114441" xlink:to="loc_ipx_ConversionOfConvertibleInstrumentsOrdinarySharesCalledAfterExpiryDate_019ceccc-6820-7c42-8615-ed7755a6f179" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/RESERVESMovementsinShareBasedPaymentsReserveDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#RESERVESMovementsinShareBasedPaymentsReserveDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/RESERVESMovementsinShareBasedPaymentsReserveDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7eaa-8a5f-d68901095e02" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7ef6-ae26-947b4f0d981f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7eaa-8a5f-d68901095e02" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7ef6-ae26-947b4f0d981f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReservesWithinEquityAxis_019ceccc-6820-7f9e-a581-7ca52c24ff58" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReservesWithinEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7ef6-ae26-947b4f0d981f" xlink:to="loc_ifrs-full_ReservesWithinEquityAxis_019ceccc-6820-7f9e-a581-7ca52c24ff58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReservesWithinEquityDomain_019ceccc-6820-7f9e-a581-7ca52c24ff58_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReservesWithinEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ReservesWithinEquityAxis_019ceccc-6820-7f9e-a581-7ca52c24ff58" xlink:to="loc_ifrs-full_ReservesWithinEquityDomain_019ceccc-6820-7f9e-a581-7ca52c24ff58_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReservesWithinEquityDomain_019ceccc-6820-7e6e-a223-d6728a5c08c8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReservesWithinEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ReservesWithinEquityAxis_019ceccc-6820-7f9e-a581-7ca52c24ff58" xlink:to="loc_ifrs-full_ReservesWithinEquityDomain_019ceccc-6820-7e6e-a223-d6728a5c08c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfSharebasedPaymentsMember_019ceccc-6820-75a9-824d-12556c9d53a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfSharebasedPaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReservesWithinEquityDomain_019ceccc-6820-7e6e-a223-d6728a5c08c8" xlink:to="loc_ifrs-full_ReserveOfSharebasedPaymentsMember_019ceccc-6820-75a9-824d-12556c9d53a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7d09-9884-c04b820fb933" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7ef6-ae26-947b4f0d981f" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7d09-9884-c04b820fb933" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7d09-9884-c04b820fb933_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7d09-9884-c04b820fb933" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7d09-9884-c04b820fb933_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7d6d-b379-e7b02558cfde" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7d09-9884-c04b820fb933" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7d6d-b379-e7b02558cfde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_UnlistedOptionsMember_019ceccc-6820-79ee-90cc-f036fb0434cd" xlink:href="ipx-20260630.xsd#ipx_UnlistedOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7d6d-b379-e7b02558cfde" xlink:to="loc_ipx_UnlistedOptionsMember_019ceccc-6820-79ee-90cc-f036fb0434cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsMember_019ceccc-6820-7afa-bc3e-1db9a7d03657" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7d6d-b379-e7b02558cfde" xlink:to="loc_ipx_PerformanceRightsMember_019ceccc-6820-7afa-bc3e-1db9a7d03657" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-769a-9a02-a93d0d89abba" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7d6d-b379-e7b02558cfde" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-769a-9a02-a93d0d89abba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfOptionsAbstract_019ceccc-6820-7333-b76a-b2bc1aa84b7e" xlink:href="ipx-20260630.xsd#ipx_NumberOfOptionsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7eaa-8a5f-d68901095e02" xlink:to="loc_ipx_NumberOfOptionsAbstract_019ceccc-6820-7333-b76a-b2bc1aa84b7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOutstandingShareOptions_019ceccc-6820-7a54-8d01-5595b61a60d4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOutstandingShareOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOptionsAbstract_019ceccc-6820-7333-b76a-b2bc1aa84b7e" xlink:to="loc_ifrs-full_NumberOfOutstandingShareOptions_019ceccc-6820-7a54-8d01-5595b61a60d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfShareOptionsGrantOfEmployeeSecuritiesInShareBasedPaymentArrangement_019ceccc-6820-75d3-a32b-66fb3f5f9f82" xlink:href="ipx-20260630.xsd#ipx_NumberOfShareOptionsGrantOfEmployeeSecuritiesInShareBasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOptionsAbstract_019ceccc-6820-7333-b76a-b2bc1aa84b7e" xlink:to="loc_ipx_NumberOfShareOptionsGrantOfEmployeeSecuritiesInShareBasedPaymentArrangement_019ceccc-6820-75d3-a32b-66fb3f5f9f82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_019ceccc-6820-79f4-89bc-baaf6cdd909f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOptionsAbstract_019ceccc-6820-7333-b76a-b2bc1aa84b7e" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_019ceccc-6820-79f4-89bc-baaf6cdd909f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_01a0cd8e-7314-73b8-856e-d76aea6794b2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOptionsAbstract_019ceccc-6820-7333-b76a-b2bc1aa84b7e" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_01a0cd8e-7314-73b8-856e-d76aea6794b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOutstandingShareOptions_019ceccc-6820-764b-9ab7-8797e6d46488" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOutstandingShareOptions"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfPerformanceRightsAndRestrictedStockUnitsAbstract_019ceccc-6820-7a3f-be41-2e3b39cac7bd" xlink:href="ipx-20260630.xsd#ipx_NumberOfPerformanceRightsAndRestrictedStockUnitsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7eaa-8a5f-d68901095e02" xlink:to="loc_ipx_NumberOfPerformanceRightsAndRestrictedStockUnitsAbstract_019ceccc-6820-7a3f-be41-2e3b39cac7bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_019ceccc-6820-7a6b-950d-aafb62066d86" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfPerformanceRightsAndRestrictedStockUnitsAbstract_019ceccc-6820-7a3f-be41-2e3b39cac7bd" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_019ceccc-6820-7a6b-950d-aafb62066d86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_019ceccc-6820-7916-91c6-897d9360971e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfPerformanceRightsAndRestrictedStockUnitsAbstract_019ceccc-6820-7a3f-be41-2e3b39cac7bd" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_019ceccc-6820-7916-91c6-897d9360971e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_019ceccc-6820-7758-a430-838b66ad4cd7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfPerformanceRightsAndRestrictedStockUnitsAbstract_019ceccc-6820-7a3f-be41-2e3b39cac7bd" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_019ceccc-6820-7758-a430-838b66ad4cd7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_019ceccc-6820-727f-88d9-89d7d38dd0fb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement_019ceccc-6820-7ac7-98f5-5947c977a5c4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfPerformanceRightsAndRestrictedStockUnitsAbstract_019ceccc-6820-7a3f-be41-2e3b39cac7bd" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement_019ceccc-6820-7ac7-98f5-5947c977a5c4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_019ceccc-6820-7790-ac36-6b4941a74ed3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract_019ceccc-6820-7a25-a3ac-fadff1825a09" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7eaa-8a5f-d68901095e02" xlink:to="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract_019ceccc-6820-7a25-a3ac-fadff1825a09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfSharebasedPayments_019ceccc-6820-7105-bba7-88237a181b10" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfSharebasedPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract_019ceccc-6820-7a25-a3ac-fadff1825a09" xlink:to="loc_ifrs-full_ReserveOfSharebasedPayments_019ceccc-6820-7105-bba7-88237a181b10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_019ceccc-6820-7160-b2aa-4f1627e993ae" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract_019ceccc-6820-7a25-a3ac-fadff1825a09" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_019ceccc-6820-7160-b2aa-4f1627e993ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughSharesToConsultantsEquity_019ceccc-6820-70b7-8141-37e6997612ec" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughSharesToConsultantsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract_019ceccc-6820-7a25-a3ac-fadff1825a09" xlink:to="loc_ipx_IncreaseDecreaseThroughSharesToConsultantsEquity_019ceccc-6820-70b7-8141-37e6997612ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughSharesToDirectorsEquity_019ceccc-6820-7c8a-b22d-9b4b558837c0" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughSharesToDirectorsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract_019ceccc-6820-7a25-a3ac-fadff1825a09" xlink:to="loc_ipx_IncreaseDecreaseThroughSharesToDirectorsEquity_019ceccc-6820-7c8a-b22d-9b4b558837c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IncreaseDecreaseThroughExpiryOfEmployeeRightsEquity_019ceccc-6820-72c6-b3ba-c8bf8098e3bb" xlink:href="ipx-20260630.xsd#ipx_IncreaseDecreaseThroughExpiryOfEmployeeRightsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract_019ceccc-6820-7a25-a3ac-fadff1825a09" xlink:to="loc_ipx_IncreaseDecreaseThroughExpiryOfEmployeeRightsEquity_019ceccc-6820-72c6-b3ba-c8bf8098e3bb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_019ceccc-6820-7cb2-85cb-271e569fb705" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract_019ceccc-6820-7a25-a3ac-fadff1825a09" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_019ceccc-6820-7cb2-85cb-271e569fb705" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfSharebasedPayments_019ceccc-6820-7b29-ad21-47fd6de51466" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfSharebasedPayments"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/RESERVESTermsandConditionsofUnlistedOptionsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#RESERVESTermsandConditionsofUnlistedOptionsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/RESERVESTermsandConditionsofUnlistedOptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-74a8-b453-263ea6e29456" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7424-8159-a374b32968e4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-74a8-b453-263ea6e29456" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7424-8159-a374b32968e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7b4b-9592-a602fac39d60" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7424-8159-a374b32968e4" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7b4b-9592-a602fac39d60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7b4b-9592-a602fac39d60_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7b4b-9592-a602fac39d60" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7b4b-9592-a602fac39d60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7082-9845-26d5cad6fefe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7b4b-9592-a602fac39d60" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7082-9845-26d5cad6fefe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_UnlistedOptionsMember_019ceccc-6820-7857-bef2-ee040ca12cb2" xlink:href="ipx-20260630.xsd#ipx_UnlistedOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7082-9845-26d5cad6fefe" xlink:to="loc_ipx_UnlistedOptionsMember_019ceccc-6820-7857-bef2-ee040ca12cb2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_UnlistedOptionsExpiringApril12027Member_01a0a52f-9da2-746c-b79a-2939df4f4638" xlink:href="ipx-20260630.xsd#ipx_UnlistedOptionsExpiringApril12027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_UnlistedOptionsMember_019ceccc-6820-7857-bef2-ee040ca12cb2" xlink:to="loc_ipx_UnlistedOptionsExpiringApril12027Member_01a0a52f-9da2-746c-b79a-2939df4f4638" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_UnlistedOptionsExpiringJune302027Member_01a0a52f-9da2-7d42-a5c9-0c5008418aa3" xlink:href="ipx-20260630.xsd#ipx_UnlistedOptionsExpiringJune302027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_UnlistedOptionsMember_019ceccc-6820-7857-bef2-ee040ca12cb2" xlink:to="loc_ipx_UnlistedOptionsExpiringJune302027Member_01a0a52f-9da2-7d42-a5c9-0c5008418aa3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorAndEmployeeOptionsMember_01a0a531-990d-72b1-909c-49055e13fb97" xlink:href="ipx-20260630.xsd#ipx_DirectorAndEmployeeOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7082-9845-26d5cad6fefe" xlink:to="loc_ipx_DirectorAndEmployeeOptionsMember_01a0a531-990d-72b1-909c-49055e13fb97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorOptionsExpiringDecember52026Member_019ceccc-6820-7570-b040-eb4ea04140b9" xlink:href="ipx-20260630.xsd#ipx_DirectorOptionsExpiringDecember52026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DirectorAndEmployeeOptionsMember_01a0a531-990d-72b1-909c-49055e13fb97" xlink:to="loc_ipx_DirectorOptionsExpiringDecember52026Member_019ceccc-6820-7570-b040-eb4ea04140b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeeOptionsExpiringApril102029Member_01a0a52f-9da2-753e-9aae-dd28e7174308" xlink:href="ipx-20260630.xsd#ipx_EmployeeOptionsExpiringApril102029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DirectorAndEmployeeOptionsMember_01a0a531-990d-72b1-909c-49055e13fb97" xlink:to="loc_ipx_EmployeeOptionsExpiringApril102029Member_01a0a52f-9da2-753e-9aae-dd28e7174308" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeeOptionsExpiringApril22030Member_01a0a52f-9da2-7554-87c5-fdea7242ded2" xlink:href="ipx-20260630.xsd#ipx_EmployeeOptionsExpiringApril22030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DirectorAndEmployeeOptionsMember_01a0a531-990d-72b1-909c-49055e13fb97" xlink:to="loc_ipx_EmployeeOptionsExpiringApril22030Member_01a0a52f-9da2-7554-87c5-fdea7242ded2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorAndEmployeeOptionsExpiringApril22031At18.00Member_01a0a52f-9da2-7fe2-8c3c-9f34e5335e0b" xlink:href="ipx-20260630.xsd#ipx_DirectorAndEmployeeOptionsExpiringApril22031At18.00Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DirectorAndEmployeeOptionsMember_01a0a531-990d-72b1-909c-49055e13fb97" xlink:to="loc_ipx_DirectorAndEmployeeOptionsExpiringApril22031At18.00Member_01a0a52f-9da2-7fe2-8c3c-9f34e5335e0b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorAndEmployeeOptionsExpiringApril22031At22.00Member_01a0a52f-9da2-7646-a715-34207a841d09" xlink:href="ipx-20260630.xsd#ipx_DirectorAndEmployeeOptionsExpiringApril22031At22.00Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_DirectorAndEmployeeOptionsMember_01a0a531-990d-72b1-909c-49055e13fb97" xlink:to="loc_ipx_DirectorAndEmployeeOptionsExpiringApril22031At22.00Member_01a0a52f-9da2-7646-a715-34207a841d09" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_TermsAndConditionsOfUnlistedOptionsAbstract_019ceccc-6820-74ea-a25f-92f71484e3dc" xlink:href="ipx-20260630.xsd#ipx_TermsAndConditionsOfUnlistedOptionsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-74a8-b453-263ea6e29456" xlink:to="loc_ipx_TermsAndConditionsOfUnlistedOptionsAbstract_019ceccc-6820-74ea-a25f-92f71484e3dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareBasedPaymentArrangementSubscriptionRights_019ceccc-6820-7a44-82c4-f6249b2ea2b7" xlink:href="ipx-20260630.xsd#ipx_ShareBasedPaymentArrangementSubscriptionRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_TermsAndConditionsOfUnlistedOptionsAbstract_019ceccc-6820-74ea-a25f-92f71484e3dc" xlink:to="loc_ipx_ShareBasedPaymentArrangementSubscriptionRights_019ceccc-6820-7a44-82c4-f6249b2ea2b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_019ceccc-6820-7950-b013-03cea8577d0e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_TermsAndConditionsOfUnlistedOptionsAbstract_019ceccc-6820-74ea-a25f-92f71484e3dc" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_019ceccc-6820-7950-b013-03cea8577d0e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExercisePriceShareOptionsGranted2019_019ceccc-6820-7817-8828-8ec714e92ac0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExercisePriceShareOptionsGranted2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_TermsAndConditionsOfUnlistedOptionsAbstract_019ceccc-6820-74ea-a25f-92f71484e3dc" xlink:to="loc_ifrs-full_ExercisePriceShareOptionsGranted2019_019ceccc-6820-7817-8828-8ec714e92ac0" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/RESERVESTermsandConditionsofPerformanceRightsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#RESERVESTermsandConditionsofPerformanceRightsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/RESERVESTermsandConditionsofPerformanceRightsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7162-a4e7-a498ef3b2071" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7f08-8826-50437dcf2e9e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7162-a4e7-a498ef3b2071" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7f08-8826-50437dcf2e9e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-78e4-b775-7bf39df2ee14" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7f08-8826-50437dcf2e9e" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-78e4-b775-7bf39df2ee14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-78e4-b775-7bf39df2ee14_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-78e4-b775-7bf39df2ee14" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-78e4-b775-7bf39df2ee14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-72ff-a283-14757001351a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-78e4-b775-7bf39df2ee14" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-72ff-a283-14757001351a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsMember_019ceccc-6820-7c5f-9902-13d00b62fb04" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-72ff-a283-14757001351a" xlink:to="loc_ipx_PerformanceRightsMember_019ceccc-6820-7c5f-9902-13d00b62fb04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeePerformanceRightsExpiringDecember212028AndDecember312027Member_019ceccc-6820-728a-81a5-d6f2cdd3d6c4" xlink:href="ipx-20260630.xsd#ipx_EmployeePerformanceRightsExpiringDecember212028AndDecember312027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-7c5f-9902-13d00b62fb04" xlink:to="loc_ipx_EmployeePerformanceRightsExpiringDecember212028AndDecember312027Member_019ceccc-6820-728a-81a5-d6f2cdd3d6c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeePerformanceRightsExpiringDecember212028Member_019ceccc-6820-70cb-bd54-a5b01fae75d4" xlink:href="ipx-20260630.xsd#ipx_EmployeePerformanceRightsExpiringDecember212028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_EmployeePerformanceRightsExpiringDecember212028AndDecember312027Member_019ceccc-6820-728a-81a5-d6f2cdd3d6c4" xlink:to="loc_ipx_EmployeePerformanceRightsExpiringDecember212028Member_019ceccc-6820-70cb-bd54-a5b01fae75d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeePerformanceRightsExpiringDecember312027Member_019ceccc-6820-7dc8-8f4d-640e878ae322" xlink:href="ipx-20260630.xsd#ipx_EmployeePerformanceRightsExpiringDecember312027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_EmployeePerformanceRightsExpiringDecember212028AndDecember312027Member_019ceccc-6820-728a-81a5-d6f2cdd3d6c4" xlink:to="loc_ipx_EmployeePerformanceRightsExpiringDecember312027Member_019ceccc-6820-7dc8-8f4d-640e878ae322" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorAndEmployeePerformanceRightsExpiringApril22031Member_01a09f0e-b4bd-7122-8ea2-9ee66dbf9e2c" xlink:href="ipx-20260630.xsd#ipx_DirectorAndEmployeePerformanceRightsExpiringApril22031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-7c5f-9902-13d00b62fb04" xlink:to="loc_ipx_DirectorAndEmployeePerformanceRightsExpiringApril22031Member_01a09f0e-b4bd-7122-8ea2-9ee66dbf9e2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeePerformanceRightsExpiringApril102031VWAP6.00Member_019ceccc-6820-7a56-b83c-c2bb5b7ff528" xlink:href="ipx-20260630.xsd#ipx_EmployeePerformanceRightsExpiringApril102031VWAP6.00Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-7c5f-9902-13d00b62fb04" xlink:to="loc_ipx_EmployeePerformanceRightsExpiringApril102031VWAP6.00Member_019ceccc-6820-7a56-b83c-c2bb5b7ff528" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeePerformanceRightsExpiringApril102031VWAP7.00Member_019ceccc-6820-7333-b75e-522d2192fec8" xlink:href="ipx-20260630.xsd#ipx_EmployeePerformanceRightsExpiringApril102031VWAP7.00Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-7c5f-9902-13d00b62fb04" xlink:to="loc_ipx_EmployeePerformanceRightsExpiringApril102031VWAP7.00Member_019ceccc-6820-7333-b75e-522d2192fec8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeePerformanceRightsExpiringApril102031VWAP8.00Member_019ceccc-6820-748e-9b85-46625bfaae4c" xlink:href="ipx-20260630.xsd#ipx_EmployeePerformanceRightsExpiringApril102031VWAP8.00Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-7c5f-9902-13d00b62fb04" xlink:to="loc_ipx_EmployeePerformanceRightsExpiringApril102031VWAP8.00Member_019ceccc-6820-748e-9b85-46625bfaae4c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeePerformanceRightsPerformanceVestingConditionExpiringDecember312026Member_019ceccc-6820-72d8-8578-259551122de2" xlink:href="ipx-20260630.xsd#ipx_EmployeePerformanceRightsPerformanceVestingConditionExpiringDecember312026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-7c5f-9902-13d00b62fb04" xlink:to="loc_ipx_EmployeePerformanceRightsPerformanceVestingConditionExpiringDecember312026Member_019ceccc-6820-72d8-8578-259551122de2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_TermsAndConditionsOfPerformanceRightsAbstract_019ceccc-6820-79db-ab01-5e2ce51a3df6" xlink:href="ipx-20260630.xsd#ipx_TermsAndConditionsOfPerformanceRightsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7162-a4e7-a498ef3b2071" xlink:to="loc_ipx_TermsAndConditionsOfPerformanceRightsAbstract_019ceccc-6820-79db-ab01-5e2ce51a3df6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ConversionOfShareBasedPaymentAwardNumberOfSharesConvertedFromVestingOfEachRight_019ceccc-6820-74d1-9d80-28c563974e41" xlink:href="ipx-20260630.xsd#ipx_ConversionOfShareBasedPaymentAwardNumberOfSharesConvertedFromVestingOfEachRight"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_TermsAndConditionsOfPerformanceRightsAbstract_019ceccc-6820-79db-ab01-5e2ce51a3df6" xlink:to="loc_ipx_ConversionOfShareBasedPaymentAwardNumberOfSharesConvertedFromVestingOfEachRight_019ceccc-6820-74d1-9d80-28c563974e41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_019ceccc-6820-76a5-81b8-29032d4fb85a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_TermsAndConditionsOfPerformanceRightsAbstract_019ceccc-6820-79db-ab01-5e2ce51a3df6" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_019ceccc-6820-76a5-81b8-29032d4fb85a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_VolumeWeightedAveragePrice_019ceccc-6820-7890-af5a-9ecc9ad72317" xlink:href="ipx-20260630.xsd#ipx_VolumeWeightedAveragePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_TermsAndConditionsOfPerformanceRightsAbstract_019ceccc-6820-79db-ab01-5e2ce51a3df6" xlink:to="loc_ipx_VolumeWeightedAveragePrice_019ceccc-6820-7890-af5a-9ecc9ad72317" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/RESERVESTermsandConditionsofRestrictedStockUnitsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#RESERVESTermsandConditionsofRestrictedStockUnitsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/RESERVESTermsandConditionsofRestrictedStockUnitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7738-af88-d921d8f566a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7ccc-931a-1976e8d82aab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7738-af88-d921d8f566a7" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7ccc-931a-1976e8d82aab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-70a8-a1cf-1ca762c512b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7ccc-931a-1976e8d82aab" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-70a8-a1cf-1ca762c512b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-70a8-a1cf-1ca762c512b3_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-70a8-a1cf-1ca762c512b3" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-70a8-a1cf-1ca762c512b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7dc3-a04d-1c0464d3baad" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-70a8-a1cf-1ca762c512b3" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7dc3-a04d-1c0464d3baad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7dc3-a04d-1c0464d3baad" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorRestrictedShareUnitExpiringDecember232026Member_01a09f0b-b2d3-75bd-addd-dddfacbc1685" xlink:href="ipx-20260630.xsd#ipx_DirectorRestrictedShareUnitExpiringDecember232026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_DirectorRestrictedShareUnitExpiringDecember232026Member_01a09f0b-b2d3-75bd-addd-dddfacbc1685" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorAndEmployeeRestrictedShareUnitExpiringDecember312026Member_01a09f0b-b2d3-726d-91af-d3fe038235ff" xlink:href="ipx-20260630.xsd#ipx_DirectorAndEmployeeRestrictedShareUnitExpiringDecember312026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_DirectorAndEmployeeRestrictedShareUnitExpiringDecember312026Member_01a09f0b-b2d3-726d-91af-d3fe038235ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorRestrictedShareUnitExpiringDecember52027Member_01a09f0b-b2d3-7b07-996e-73069d1413b8" xlink:href="ipx-20260630.xsd#ipx_DirectorRestrictedShareUnitExpiringDecember52027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_DirectorRestrictedShareUnitExpiringDecember52027Member_01a09f0b-b2d3-7b07-996e-73069d1413b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeeRestrictedShareUnitExpiringDecember312027Member_01a09f0b-b2d3-70af-b3aa-a27f1b642702" xlink:href="ipx-20260630.xsd#ipx_EmployeeRestrictedShareUnitExpiringDecember312027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_EmployeeRestrictedShareUnitExpiringDecember312027Member_01a09f0b-b2d3-70af-b3aa-a27f1b642702" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeeRestrictedShareUnitExpiringMarch22028Member_01a09f0b-b2d3-71df-a2ab-8b1629ce4dff" xlink:href="ipx-20260630.xsd#ipx_EmployeeRestrictedShareUnitExpiringMarch22028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_EmployeeRestrictedShareUnitExpiringMarch22028Member_01a09f0b-b2d3-71df-a2ab-8b1629ce4dff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeeRestrictedShareUnitExpiringApril22028Member_01a09f0b-b2d3-725d-b1b6-e7f128bbed61" xlink:href="ipx-20260630.xsd#ipx_EmployeeRestrictedShareUnitExpiringApril22028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_EmployeeRestrictedShareUnitExpiringApril22028Member_01a09f0b-b2d3-725d-b1b6-e7f128bbed61" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorRestrictedShareUnitExpiringDecember162028Member_01a09f0b-b2d3-7b65-a9ce-a76d7a51934c" xlink:href="ipx-20260630.xsd#ipx_DirectorRestrictedShareUnitExpiringDecember162028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_DirectorRestrictedShareUnitExpiringDecember162028Member_01a09f0b-b2d3-7b65-a9ce-a76d7a51934c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeeRestrictedShareUnitExpiringDecember312028Member_01a09f0b-b2d3-7508-9f9e-5f8abf30307c" xlink:href="ipx-20260630.xsd#ipx_EmployeeRestrictedShareUnitExpiringDecember312028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_EmployeeRestrictedShareUnitExpiringDecember312028Member_01a09f0b-b2d3-7508-9f9e-5f8abf30307c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_DirectorAndEmployeeRestrictedShareUnitExpiringApril102029Member_01a09f0b-b2d3-72dd-8e97-53f62136a06d" xlink:href="ipx-20260630.xsd#ipx_DirectorAndEmployeeRestrictedShareUnitExpiringApril102029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_DirectorAndEmployeeRestrictedShareUnitExpiringApril102029Member_01a09f0b-b2d3-72dd-8e97-53f62136a06d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeeRestrictedShareUnitExpiringDecember312029Member_01a09f0b-b2d3-71c3-82c7-50d47fb42ced" xlink:href="ipx-20260630.xsd#ipx_EmployeeRestrictedShareUnitExpiringDecember312029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_EmployeeRestrictedShareUnitExpiringDecember312029Member_01a09f0b-b2d3-71c3-82c7-50d47fb42ced" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_EmployeeRestrictedShareUnitExpiringApril22030Member_01a09f0b-b2d3-7de5-8927-eb70cc0e4fcc" xlink:href="ipx-20260630.xsd#ipx_EmployeeRestrictedShareUnitExpiringApril22030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7915-88f1-34dd7d2fe6a4" xlink:to="loc_ipx_EmployeeRestrictedShareUnitExpiringApril22030Member_01a09f0b-b2d3-7de5-8927-eb70cc0e4fcc" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_TermsAndConditionsOfRestrictedStockUnitsAbstract_019ceccc-6820-78f1-9a39-339a80176754" xlink:href="ipx-20260630.xsd#ipx_TermsAndConditionsOfRestrictedStockUnitsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7738-af88-d921d8f566a7" xlink:to="loc_ipx_TermsAndConditionsOfRestrictedStockUnitsAbstract_019ceccc-6820-78f1-9a39-339a80176754" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ConversionOfShareBasedPaymentAwardNumberOfSharesConvertedFromVestingOfEachRight_019ceccc-6820-70bc-bbaf-e3b15cc885e9" xlink:href="ipx-20260630.xsd#ipx_ConversionOfShareBasedPaymentAwardNumberOfSharesConvertedFromVestingOfEachRight"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_TermsAndConditionsOfRestrictedStockUnitsAbstract_019ceccc-6820-78f1-9a39-339a80176754" xlink:to="loc_ipx_ConversionOfShareBasedPaymentAwardNumberOfSharesConvertedFromVestingOfEachRight_019ceccc-6820-70bc-bbaf-e3b15cc885e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_019ceccc-6820-703e-a388-c05d1c16e0e5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_TermsAndConditionsOfRestrictedStockUnitsAbstract_019ceccc-6820-78f1-9a39-339a80176754" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_019ceccc-6820-703e-a388-c05d1c16e0e5" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/LOSSPERSHARENarrativeDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#LOSSPERSHARENarrativeDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/LOSSPERSHARENarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EarningsPerShareLineItems_01a0b55e-2887-7af0-afb2-199020b4c349" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EarningsPerShareTable_019ceccc-6820-7943-8ab6-3a90d4e0b30b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_01a0b55e-2887-7af0-afb2-199020b4c349" xlink:to="loc_ifrs-full_EarningsPerShareTable_019ceccc-6820-7943-8ab6-3a90d4e0b30b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfAntidilutiveInstrumentsAxis_019ceccc-6820-741a-9c95-8e209704a363" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfAntidilutiveInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_EarningsPerShareTable_019ceccc-6820-7943-8ab6-3a90d4e0b30b" xlink:to="loc_ifrs-full_TypesOfAntidilutiveInstrumentsAxis_019ceccc-6820-741a-9c95-8e209704a363" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_019ceccc-6820-741a-9c95-8e209704a363_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfAntidilutiveInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfAntidilutiveInstrumentsAxis_019ceccc-6820-741a-9c95-8e209704a363" xlink:to="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_019ceccc-6820-741a-9c95-8e209704a363_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_019ceccc-6820-7274-bdd4-28b25034ff2b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfAntidilutiveInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfAntidilutiveInstrumentsAxis_019ceccc-6820-741a-9c95-8e209704a363" xlink:to="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_019ceccc-6820-7274-bdd4-28b25034ff2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-7451-a9e9-82d57adda33d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_019ceccc-6820-7274-bdd4-28b25034ff2b" xlink:to="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-7451-a9e9-82d57adda33d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsMember_019ceccc-6820-71f5-b9e4-bb8e8ca2d6fe" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_019ceccc-6820-7274-bdd4-28b25034ff2b" xlink:to="loc_ipx_PerformanceRightsMember_019ceccc-6820-71f5-b9e4-bb8e8ca2d6fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ac8-b8ab-e06473f8efa7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfAntidilutiveInstrumentsDomain_019ceccc-6820-7274-bdd4-28b25034ff2b" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ac8-b8ab-e06473f8efa7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019ceccc-6820-74b1-a153-e7496907e943" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_EarningsPerShareTable_019ceccc-6820-7943-8ab6-3a90d4e0b30b" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019ceccc-6820-74b1-a153-e7496907e943" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019ceccc-6820-74b1-a153-e7496907e943_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019ceccc-6820-74b1-a153-e7496907e943" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019ceccc-6820-74b1-a153-e7496907e943_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019ceccc-6820-757f-8efe-32dc6953cf4f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019ceccc-6820-74b1-a153-e7496907e943" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019ceccc-6820-757f-8efe-32dc6953cf4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorOrdinaryShareTransactionsMember_01a0b55e-2887-7915-90bb-5577569aefb7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorOrdinaryShareTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019ceccc-6820-757f-8efe-32dc6953cf4f" xlink:to="loc_ifrs-full_MajorOrdinaryShareTransactionsMember_01a0b55e-2887-7915-90bb-5577569aefb7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedStockUnitsTransactionsMember_01a0b55e-443d-772e-88be-bfdf52cb2e71" xlink:href="ipx-20260630.xsd#ipx_RestrictedStockUnitsTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019ceccc-6820-757f-8efe-32dc6953cf4f" xlink:to="loc_ipx_RestrictedStockUnitsTransactionsMember_01a0b55e-443d-772e-88be-bfdf52cb2e71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_OptionsTransactionsMember_01a0b55e-443d-7801-9c4f-a517e1d6f4f7" xlink:href="ipx-20260630.xsd#ipx_OptionsTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019ceccc-6820-757f-8efe-32dc6953cf4f" xlink:to="loc_ipx_OptionsTransactionsMember_01a0b55e-443d-7801-9c4f-a517e1d6f4f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfInstrumentsThatAreAntidilutiveInPeriodPresented_01a0b55e-2887-71c5-b65f-e88302034d3a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsThatAreAntidilutiveInPeriodPresented"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_01a0b55e-2887-7af0-afb2-199020b4c349" xlink:to="loc_ifrs-full_NumberOfInstrumentsThatAreAntidilutiveInPeriodPresented_01a0b55e-2887-71c5-b65f-e88302034d3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedThroughSharePlacements_01a0b55e-2887-7f48-ae86-4c1f2c0edc20" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedThroughSharePlacements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_01a0b55e-2887-7af0-afb2-199020b4c349" xlink:to="loc_ipx_NumberOfSharesIssuedThroughSharePlacements_01a0b55e-2887-7f48-ae86-4c1f2c0edc20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_01a0b55e-2887-76dd-9a12-5ad5ea9d1fb3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_01a0b55e-2887-7af0-afb2-199020b4c349" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_01a0b55e-2887-76dd-9a12-5ad5ea9d1fb3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedToDirector_01a0b55e-443d-784d-9a70-39439c59bdfa" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedToDirector"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_01a0b55e-2887-7af0-afb2-199020b4c349" xlink:to="loc_ipx_NumberOfSharesIssuedToDirector_01a0b55e-443d-784d-9a70-39439c59bdfa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfSharesIssuedToCounterparty_01a0b55e-443d-7452-8a20-6af5ea0bb945" xlink:href="ipx-20260630.xsd#ipx_NumberOfSharesIssuedToCounterparty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_01a0b55e-2887-7af0-afb2-199020b4c349" xlink:to="loc_ipx_NumberOfSharesIssuedToCounterparty_01a0b55e-443d-7452-8a20-6af5ea0bb945" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/RELATEDPARTIESScheduleofSubsidiariesDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#RELATEDPARTIESScheduleofSubsidiariesDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/RELATEDPARTIESScheduleofSubsidiariesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019ceccc-6820-7398-a582-7363f8696071" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019ceccc-6820-7d6b-8be0-0dd43ee2834c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019ceccc-6820-7398-a582-7363f8696071" xlink:to="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019ceccc-6820-7d6b-8be0-0dd43ee2834c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019ceccc-6820-7b0a-b6d0-36fff1171354" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019ceccc-6820-7d6b-8be0-0dd43ee2834c" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019ceccc-6820-7b0a-b6d0-36fff1171354" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019ceccc-6820-7b0a-b6d0-36fff1171354_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019ceccc-6820-7b0a-b6d0-36fff1171354" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019ceccc-6820-7b0a-b6d0-36fff1171354_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019ceccc-6820-7132-8c58-3633639d807b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019ceccc-6820-7b0a-b6d0-36fff1171354" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019ceccc-6820-7132-8c58-3633639d807b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_HyperionMetalsAustraliaPtyLtdMember_019ceccc-6820-79c8-9bea-eb2422f86e67" xlink:href="ipx-20260630.xsd#ipx_HyperionMetalsAustraliaPtyLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019ceccc-6820-7132-8c58-3633639d807b" xlink:to="loc_ipx_HyperionMetalsAustraliaPtyLtdMember_019ceccc-6820-79c8-9bea-eb2422f86e67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IperionXCriticalMineralsLLCMember_019ceccc-6820-75d5-b861-0d430b25c7f3" xlink:href="ipx-20260630.xsd#ipx_IperionXCriticalMineralsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019ceccc-6820-7132-8c58-3633639d807b" xlink:to="loc_ipx_IperionXCriticalMineralsLLCMember_019ceccc-6820-75d5-b861-0d430b25c7f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IperionXTechnologyLLCMember_019ceccc-6820-7353-b908-8c1d831e3acd" xlink:href="ipx-20260630.xsd#ipx_IperionXTechnologyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019ceccc-6820-7132-8c58-3633639d807b" xlink:to="loc_ipx_IperionXTechnologyLLCMember_019ceccc-6820-7353-b908-8c1d831e3acd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_IperionXInc.Member_019ceccc-6820-71ed-8f2b-0f8cb11fcffc" xlink:href="ipx-20260630.xsd#ipx_IperionXInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019ceccc-6820-7132-8c58-3633639d807b" xlink:to="loc_ipx_IperionXInc.Member_019ceccc-6820-71ed-8f2b-0f8cb11fcffc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesAbstract_019ceccc-6820-72ae-8ea2-b85ea82f30d4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019ceccc-6820-7398-a582-7363f8696071" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesAbstract_019ceccc-6820-72ae-8ea2-b85ea82f30d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary_019ceccc-6820-7c8a-81f9-24bf61081dbe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesAbstract_019ceccc-6820-72ae-8ea2-b85ea82f30d4" xlink:to="loc_ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary_019ceccc-6820-7c8a-81f9-24bf61081dbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019ceccc-6820-7c5e-aa0c-57cc008041c8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesAbstract_019ceccc-6820-72ae-8ea2-b85ea82f30d4" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019ceccc-6820-7c5e-aa0c-57cc008041c8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/RELATEDPARTIESNarrativeDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#RELATEDPARTIESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/RELATEDPARTIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019ceccc-6820-718c-9749-57fe50aaa299" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019ceccc-6820-7e99-816f-a5ce7e3fc044" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019ceccc-6820-718c-9749-57fe50aaa299" xlink:to="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019ceccc-6820-7e99-816f-a5ce7e3fc044" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SeparateManagementEntitiesAxis_019ceccc-6820-7ae5-bf6a-b9fd925d4cf3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SeparateManagementEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019ceccc-6820-7e99-816f-a5ce7e3fc044" xlink:to="loc_ifrs-full_SeparateManagementEntitiesAxis_019ceccc-6820-7ae5-bf6a-b9fd925d4cf3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SeparateManagementEntitiesDomain_019ceccc-6820-7ae5-bf6a-b9fd925d4cf3_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SeparateManagementEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SeparateManagementEntitiesAxis_019ceccc-6820-7ae5-bf6a-b9fd925d4cf3" xlink:to="loc_ifrs-full_SeparateManagementEntitiesDomain_019ceccc-6820-7ae5-bf6a-b9fd925d4cf3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SeparateManagementEntitiesDomain_019ceccc-6820-7ae4-a045-7ae14fbdd62f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SeparateManagementEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SeparateManagementEntitiesAxis_019ceccc-6820-7ae5-bf6a-b9fd925d4cf3" xlink:to="loc_ifrs-full_SeparateManagementEntitiesDomain_019ceccc-6820-7ae4-a045-7ae14fbdd62f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ApolloGroupMember_019ceccc-6820-7bcb-a80f-5099de49f47f" xlink:href="ipx-20260630.xsd#ipx_ApolloGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SeparateManagementEntitiesDomain_019ceccc-6820-7ae4-a045-7ae14fbdd62f" xlink:to="loc_ipx_ApolloGroupMember_019ceccc-6820-7bcb-a80f-5099de49f47f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceIndustriesInc.Member_019ceccc-6820-70d4-b523-8fa455657d16" xlink:href="ipx-20260630.xsd#ipx_PerformanceIndustriesInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SeparateManagementEntitiesDomain_019ceccc-6820-7ae4-a045-7ae14fbdd62f" xlink:to="loc_ipx_PerformanceIndustriesInc.Member_019ceccc-6820-70d4-b523-8fa455657d16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TransfersUnderFinanceAgreementsFromEntityRelatedPartyTransactions_019ceccc-6820-78df-a972-7aee5fb1717c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TransfersUnderFinanceAgreementsFromEntityRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019ceccc-6820-718c-9749-57fe50aaa299" xlink:to="loc_ifrs-full_TransfersUnderFinanceAgreementsFromEntityRelatedPartyTransactions_019ceccc-6820-78df-a972-7aee5fb1717c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TransfersUnderFinanceAgreementsToEntityRelatedPartyTransactions_019ceccc-6820-7440-b993-974a66701d17" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TransfersUnderFinanceAgreementsToEntityRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019ceccc-6820-718c-9749-57fe50aaa299" xlink:to="loc_ifrs-full_TransfersUnderFinanceAgreementsToEntityRelatedPartyTransactions_019ceccc-6820-7440-b993-974a66701d17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AmountIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntity_019ceccc-6820-7031-89f2-1a286e26571e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmountIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019ceccc-6820-718c-9749-57fe50aaa299" xlink:to="loc_ifrs-full_AmountIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntity_019ceccc-6820-7031-89f2-1a286e26571e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/SHAREBASEDPAYMENTSNarrativeDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#SHAREBASEDPAYMENTSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/SHAREBASEDPAYMENTSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-72cf-986f-2e17c2660f4e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7a2a-825b-6239e3c840b9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-72cf-986f-2e17c2660f4e" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7a2a-825b-6239e3c840b9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-6820-7dab-9da4-36d65c1f59ec" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInvestmentPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7a2a-825b-6239e3c840b9" xlink:to="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-6820-7dab-9da4-36d65c1f59ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-6820-7dab-9da4-36d65c1f59ec_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInvestmentPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-6820-7dab-9da4-36d65c1f59ec" xlink:to="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-6820-7dab-9da4-36d65c1f59ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-6820-7bd8-b374-a3991949d00e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInvestmentPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-6820-7dab-9da4-36d65c1f59ec" xlink:to="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-6820-7bd8-b374-a3991949d00e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_BlacksandTechnologyLLCMember_019ceccc-6820-7f2e-ac1a-418eab79e0d1" xlink:href="ipx-20260630.xsd#ipx_BlacksandTechnologyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-6820-7bd8-b374-a3991949d00e" xlink:to="loc_ipx_BlacksandTechnologyLLCMember_019ceccc-6820-7f2e-ac1a-418eab79e0d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareBasedCompensationExpensePrepayment_019ceccc-6820-7f77-8926-7c776d45aa81" xlink:href="ipx-20260630.xsd#ipx_ShareBasedCompensationExpensePrepayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-72cf-986f-2e17c2660f4e" xlink:to="loc_ipx_ShareBasedCompensationExpensePrepayment_019ceccc-6820-7f77-8926-7c776d45aa81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesIssued_019ceccc-6820-7bb8-96a7-b1472d4bcb78" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-72cf-986f-2e17c2660f4e" xlink:to="loc_ifrs-full_NumberOfSharesIssued_019ceccc-6820-7bb8-96a7-b1472d4bcb78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ExerciseOfOptionToPurchaseSettledInShares_019ceccc-6820-7217-9fbb-0eddaaa8b933" xlink:href="ipx-20260630.xsd#ipx_ExerciseOfOptionToPurchaseSettledInShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-72cf-986f-2e17c2660f4e" xlink:to="loc_ipx_ExerciseOfOptionToPurchaseSettledInShares_019ceccc-6820-7217-9fbb-0eddaaa8b933" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019_019ceccc-6820-7c60-a975-463722874956" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-72cf-986f-2e17c2660f4e" xlink:to="loc_ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019_019ceccc-6820-7c60-a975-463722874956" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/SHAREBASEDPAYMENTSSummaryofSecuritiesGrantedasShareBasedPaymentsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#SHAREBASEDPAYMENTSSummaryofSecuritiesGrantedasShareBasedPaymentsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/SHAREBASEDPAYMENTSSummaryofSecuritiesGrantedasShareBasedPaymentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7980-8411-48ed8d9fbe9b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7198-b3f0-5e551af174a9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7980-8411-48ed8d9fbe9b" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7198-b3f0-5e551af174a9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-760a-811e-19c6b925bbf7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7198-b3f0-5e551af174a9" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-760a-811e-19c6b925bbf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-760a-811e-19c6b925bbf7_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-760a-811e-19c6b925bbf7" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-760a-811e-19c6b925bbf7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7de5-b150-2d40741a66da" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-760a-811e-19c6b925bbf7" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7de5-b150-2d40741a66da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7b46-afa3-df10de8cf9c6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7de5-b150-2d40741a66da" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7b46-afa3-df10de8cf9c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsMarketConditionsMember_019ceccc-6820-7da2-9cbc-273d337cf066" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsMarketConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7de5-b150-2d40741a66da" xlink:to="loc_ipx_PerformanceRightsMarketConditionsMember_019ceccc-6820-7da2-9cbc-273d337cf066" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsPerformanceConditionsMember_019ceccc-6820-773f-aaef-9fb9321d1fdb" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsPerformanceConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7de5-b150-2d40741a66da" xlink:to="loc_ipx_PerformanceRightsPerformanceConditionsMember_019ceccc-6820-773f-aaef-9fb9321d1fdb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:href="ipx-20260630.xsd#ipx_NumberOfOutstandingInstrumentsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7980-8411-48ed8d9fbe9b" xlink:to="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOutstandingShareOptions_019ceccc-6820-774d-88d2-b645d9d288ef" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOutstandingShareOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:to="loc_ifrs-full_NumberOfOutstandingShareOptions_019ceccc-6820-774d-88d2-b645d9d288ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_019ceccc-6820-7bcb-826d-af88d17dcf57" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:to="loc_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_019ceccc-6820-7bcb-826d-af88d17dcf57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_019ceccc-6820-7299-a47e-a36688f7dcee" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_019ceccc-6820-7299-a47e-a36688f7dcee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement_019ceccc-6820-773c-936b-5f764083b382" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:to="loc_ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement_019ceccc-6820-773c-936b-5f764083b382" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOutstandingShareOptions_019ceccc-6820-7d5d-8adf-5f4b9c689347" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOutstandingShareOptions"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_019ceccc-6820-72b8-8afb-4011cfaa11ff" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_019ceccc-6820-72b8-8afb-4011cfaa11ff" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_019ceccc-6820-7d5f-a18e-74c5f2127bfb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_019ceccc-6820-7d5f-a18e-74c5f2127bfb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_019ceccc-6820-7760-89e1-2f2e1e455e68" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_019ceccc-6820-7760-89e1-2f2e1e455e68" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_019ceccc-6820-784f-89ac-3252f5e38f19" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_NumberOfOutstandingInstrumentsRollForward_019ceccc-6820-77e9-ab3d-6d23c2a760d9" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_019ceccc-6820-784f-89ac-3252f5e38f19" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_019ceccc-6820-7499-b1dc-4005eec1b4f2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:href="ipx-20260630.xsd#ipx_WeightedAverageExercisePriceOfInstrumentsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-7980-8411-48ed8d9fbe9b" xlink:to="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_019ceccc-6820-7105-85cb-9ea8ca4f823f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_019ceccc-6820-7105-85cb-9ea8ca4f823f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_019ceccc-6820-70e2-9b49-32b1ee0e452d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_019ceccc-6820-70e2-9b49-32b1ee0e452d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_019ceccc-6820-73f1-9b16-7f32aedf47fe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019_019ceccc-6820-73f1-9b16-7f32aedf47fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019_019ceccc-6820-7aa5-a806-c7aaff160cbb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement2019_019ceccc-6820-7aa5-a806-c7aaff160cbb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_019ceccc-6820-772b-89d7-223f0eb00cd8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement2019_019ceccc-6820-70a3-922a-727e815ca740" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement2019_019ceccc-6820-70a3-922a-727e815ca740" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019_019ceccc-6820-771e-ab0f-f451044030f7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019_019ceccc-6820-771e-ab0f-f451044030f7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement2019_019ceccc-6820-7337-8930-016e89aa7c8c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement2019_019ceccc-6820-7337-8930-016e89aa7c8c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement2019_019ceccc-6820-7d2f-bd3b-2acfec1bd7e9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_WeightedAverageExercisePriceOfInstrumentsRollForward_019ceccc-6820-7792-a4ab-0bf718a500ee" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement2019_019ceccc-6820-7d2f-bd3b-2acfec1bd7e9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement2019_019ceccc-6820-7f2c-9358-5a676dd067f5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement2019"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/SHAREBASEDPAYMENTSOptionsRightsandRSUsGrantedasShareBasedPaymentsDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#SHAREBASEDPAYMENTSOptionsRightsandRSUsGrantedasShareBasedPaymentsDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/SHAREBASEDPAYMENTSOptionsRightsandRSUsGrantedasShareBasedPaymentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-774b-b388-ee7372276a6a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7617-8d1b-16622542ce96" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-774b-b388-ee7372276a6a" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7617-8d1b-16622542ce96" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7dd0-ae71-6cb662acc40f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_019ceccc-6820-7617-8d1b-16622542ce96" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7dd0-ae71-6cb662acc40f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7dd0-ae71-6cb662acc40f_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7dd0-ae71-6cb662acc40f" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7dd0-ae71-6cb662acc40f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7776-bc34-6821b1dd32a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_019ceccc-6820-7dd0-ae71-6cb662acc40f" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7776-bc34-6821b1dd32a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7776-bc34-6821b1dd32a7" xlink:to="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries1Member_019ceccc-6820-7643-a185-0056b12806ee" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries1Member_019ceccc-6820-7643-a185-0056b12806ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries2Member_019ceccc-6820-72cb-af02-aead00a6219d" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries2Member_019ceccc-6820-72cb-af02-aead00a6219d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries3Member_019ceccc-6820-7e66-bace-8033fd4fc7a3" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries3Member_019ceccc-6820-7e66-bace-8033fd4fc7a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries4Member_019ceccc-6820-7c47-960f-36215cbb0125" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries4Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries4Member_019ceccc-6820-7c47-960f-36215cbb0125" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries5Member_019ceccc-6820-7d9d-ac53-078d68f827d0" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries5Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries5Member_019ceccc-6820-7d9d-ac53-078d68f827d0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries6Member_019ceccc-6820-79a8-bdae-0aa3de29cd51" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries6Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries6Member_019ceccc-6820-79a8-bdae-0aa3de29cd51" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries7Member_019ceccc-6820-70bb-9f79-1bbb13e7ea47" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries7Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries7Member_019ceccc-6820-70bb-9f79-1bbb13e7ea47" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries8Member_019ceccc-6820-74b3-acd2-d3c9228680ef" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries8Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries8Member_019ceccc-6820-74b3-acd2-d3c9228680ef" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries9Member_019ceccc-6820-7ed0-a141-0ea8a459e90d" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries9Member_019ceccc-6820-7ed0-a141-0ea8a459e90d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries10Member_019ceccc-6820-799c-92b5-1aae674b527a" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries10Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries10Member_019ceccc-6820-799c-92b5-1aae674b527a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries11Member_019ceccc-6820-748c-9c66-d05ca2f80fa6" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries11Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries11Member_019ceccc-6820-748c-9c66-d05ca2f80fa6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries12Member_019ceccc-6820-7cb3-8258-47a63f3e736f" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries12Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries12Member_019ceccc-6820-7cb3-8258-47a63f3e736f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries13Member_019ceccc-6820-7536-81ca-9fc3d84f75ac" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries13Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries13Member_019ceccc-6820-7536-81ca-9fc3d84f75ac" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries14Member_019ceccc-6820-7c10-8646-b5c3e4c6a5d4" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries14Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries14Member_019ceccc-6820-7c10-8646-b5c3e4c6a5d4" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries15Member_019ceccc-6820-797d-b00a-9cc5f5294e31" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries15Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries15Member_019ceccc-6820-797d-b00a-9cc5f5294e31" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries16Member_01a09eb9-dcae-7cfb-8ed1-4871d6bbbec7" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries16Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries16Member_01a09eb9-dcae-7cfb-8ed1-4871d6bbbec7" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries17Member_019ceccc-6820-7a7d-8e1a-89d7065525ce" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries17Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries17Member_019ceccc-6820-7a7d-8e1a-89d7065525ce" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries18Member_019ceccc-6820-756f-bca0-baa413d26f6c" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries18Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries18Member_019ceccc-6820-756f-bca0-baa413d26f6c" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries19Member_019ceccc-6820-7f6f-8df5-eab736b518c2" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries19Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries19Member_019ceccc-6820-7f6f-8df5-eab736b518c2" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries20Member_019ceccc-6820-7fb0-a32e-46119d283ec0" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries20Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries20Member_019ceccc-6820-7fb0-a32e-46119d283ec0" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries21Member_019ceccc-6820-7ff8-a8f6-17cdabb2cbe4" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries21Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries21Member_019ceccc-6820-7ff8-a8f6-17cdabb2cbe4" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries32Member_019ceccc-6820-710c-8dd8-d50d1fd2a9a7" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries32Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries32Member_019ceccc-6820-710c-8dd8-d50d1fd2a9a7" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries33Member_019ceccc-6820-747a-a773-53d40d0b3fd2" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries33Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries33Member_019ceccc-6820-747a-a773-53d40d0b3fd2" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceRightsSeries34Member_019ceccc-6820-7052-bea0-cf446de1a25a" xlink:href="ipx-20260630.xsd#ipx_PerformanceRightsSeries34Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceRightsMember_019ceccc-6820-76a9-abaa-e10a1cc5900f" xlink:to="loc_ipx_PerformanceRightsSeries34Member_019ceccc-6820-7052-bea0-cf446de1a25a" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7776-bc34-6821b1dd32a7" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries2Member_01a09eb9-dcae-7008-b075-290090622b6d" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries2Member_01a09eb9-dcae-7008-b075-290090622b6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries3Member_019ceccc-6820-7ce0-b3f4-1c0aec24028f" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries3Member_019ceccc-6820-7ce0-b3f4-1c0aec24028f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries6Member_019ceccc-6820-7d48-967d-6abc4d491f25" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries6Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries6Member_019ceccc-6820-7d48-967d-6abc4d491f25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries7Member_019ceccc-6820-7019-b67b-067aae7294f9" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries7Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries7Member_019ceccc-6820-7019-b67b-067aae7294f9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries9Member_019ceccc-6820-7f89-baca-32c8d0f2b86c" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries9Member_019ceccc-6820-7f89-baca-32c8d0f2b86c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries10Member_019ceccc-6820-77e7-8c2e-ee30a6e33fb1" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries10Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries10Member_019ceccc-6820-77e7-8c2e-ee30a6e33fb1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries11Member_019ceccc-6820-7716-acf0-45099fa9d579" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries11Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries11Member_019ceccc-6820-7716-acf0-45099fa9d579" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries12Member_019ceccc-6820-7592-a0d8-67302e2d15e6" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries12Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries12Member_019ceccc-6820-7592-a0d8-67302e2d15e6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries13Member_019ceccc-6820-7c01-83c7-7ab0f5384cf3" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries13Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries13Member_019ceccc-6820-7c01-83c7-7ab0f5384cf3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries15Member_019ceccc-6820-7619-a970-1bf0ee8c3ac1" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries15Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries15Member_019ceccc-6820-7619-a970-1bf0ee8c3ac1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries16Member_019ceccc-6820-7b80-a5b8-ce4c308ec54b" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries16Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries16Member_019ceccc-6820-7b80-a5b8-ce4c308ec54b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries17Member_019ceccc-6820-7afa-97ce-65dadcd7d804" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries17Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries17Member_019ceccc-6820-7afa-97ce-65dadcd7d804" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries21Member_019ceccc-6820-77a9-a70a-90b9094935e4" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries21Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries21Member_019ceccc-6820-77a9-a70a-90b9094935e4" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries22Member_019ceccc-6820-7a18-ad8b-da14f263d409" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries22Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries22Member_019ceccc-6820-7a18-ad8b-da14f263d409" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries24Member_019ceccc-6820-78ef-9796-8d1a837d121a" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries24Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries24Member_019ceccc-6820-78ef-9796-8d1a837d121a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries25Member_019ceccc-6820-7df4-805e-d799fd323e37" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries25Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries25Member_019ceccc-6820-7df4-805e-d799fd323e37" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries26Member_019ceccc-6820-7b54-b425-9290000e2c52" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries26Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries26Member_019ceccc-6820-7b54-b425-9290000e2c52" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries27Member_019ceccc-6820-7c8a-bdd1-4b3ed484acb4" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries27Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries27Member_019ceccc-6820-7c8a-bdd1-4b3ed484acb4" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries29Member_019ceccc-6820-7c62-bd71-9ab750074d7c" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries29Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries29Member_019ceccc-6820-7c62-bd71-9ab750074d7c" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_RestrictedShareUnitsSeries31Member_019ceccc-6820-7403-a60b-6d8bcd0d87b7" xlink:href="ipx-20260630.xsd#ipx_RestrictedShareUnitsSeries31Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember_019ceccc-6820-7ada-aa50-966dcb5e69ea" xlink:to="loc_ipx_RestrictedShareUnitsSeries31Member_019ceccc-6820-7403-a60b-6d8bcd0d87b7" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7776-bc34-6821b1dd32a7" xlink:to="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries1Member_019ceccc-6820-71f9-a85d-bd776a45411a" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries1Member_019ceccc-6820-71f9-a85d-bd776a45411a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries2Member_019ceccc-6820-7414-80ce-51ba86eed4c8" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries2Member_019ceccc-6820-7414-80ce-51ba86eed4c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries4Member_01a09eb9-dcae-75bc-9220-144ee2328d59" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries4Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries4Member_01a09eb9-dcae-75bc-9220-144ee2328d59" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries7Member_01a09eb9-dcae-745a-bae7-e4b29b2a94c0" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries7Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries7Member_01a09eb9-dcae-745a-bae7-e4b29b2a94c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries8Member_01a09eb9-dcae-7515-b466-b5e844fe5600" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries8Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries8Member_01a09eb9-dcae-7515-b466-b5e844fe5600" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries9Member_01a09eb9-dcae-70fc-9898-c8afd7b412df" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries9Member_01a09eb9-dcae-70fc-9898-c8afd7b412df" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries14Member_019ceccc-6820-7899-91bc-827b90a89042" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries14Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries14Member_019ceccc-6820-7899-91bc-827b90a89042" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries15Member_01a09eb9-dcae-70c7-b05f-917c04cb3615" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries15Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries15Member_01a09eb9-dcae-70c7-b05f-917c04cb3615" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries23Member_019ceccc-6820-7335-94e9-e3c7c6fb0baf" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries23Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries23Member_019ceccc-6820-7335-94e9-e3c7c6fb0baf" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries28Member_019ceccc-6820-7626-8252-b49dee537012" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries28Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries28Member_019ceccc-6820-7626-8252-b49dee537012" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ShareOptionsSeries30Member_019ceccc-6820-7027-8aca-0028c76793bb" xlink:href="ipx-20260630.xsd#ipx_ShareOptionsSeries30Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ShareOptionsMember_019ceccc-6820-74d9-b3be-3fff6f90284f" xlink:to="loc_ipx_ShareOptionsSeries30Member_019ceccc-6820-7027-8aca-0028c76793bb" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceShareMember_019ceccc-6820-74f9-9521-55f36f177f24" xlink:href="ipx-20260630.xsd#ipx_PerformanceShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_019ceccc-6820-7776-bc34-6821b1dd32a7" xlink:to="loc_ipx_PerformanceShareMember_019ceccc-6820-74f9-9521-55f36f177f24" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceSharesSeries1Member_019ceccc-6820-709f-8ca1-cf01f8f448d5" xlink:href="ipx-20260630.xsd#ipx_PerformanceSharesSeries1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceShareMember_019ceccc-6820-74f9-9521-55f36f177f24" xlink:to="loc_ipx_PerformanceSharesSeries1Member_019ceccc-6820-709f-8ca1-cf01f8f448d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceSharesSeries8Member_019ceccc-6820-7a4a-b273-1aaf9887536d" xlink:href="ipx-20260630.xsd#ipx_PerformanceSharesSeries8Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceShareMember_019ceccc-6820-74f9-9521-55f36f177f24" xlink:to="loc_ipx_PerformanceSharesSeries8Member_019ceccc-6820-7a4a-b273-1aaf9887536d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_PerformanceSharesSeries9Member_019ceccc-6820-7d35-b97c-d01c0f7d38a5" xlink:href="ipx-20260630.xsd#ipx_PerformanceSharesSeries9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_PerformanceShareMember_019ceccc-6820-74f9-9521-55f36f177f24" xlink:to="loc_ipx_PerformanceSharesSeries9Member_019ceccc-6820-7d35-b97c-d01c0f7d38a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract_019ceccc-6820-70d7-b709-eb47910e9cbc" xlink:href="ipx-20260630.xsd#ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_019ceccc-6820-774b-b388-ee7372276a6a" xlink:to="loc_ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract_019ceccc-6820-70d7-b709-eb47910e9cbc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_019ceccc-6820-795d-993f-9260ee2ec9ab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract_019ceccc-6820-70d7-b709-eb47910e9cbc" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_019ceccc-6820-795d-993f-9260ee2ec9ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_019ceccc-6820-73da-bfda-8f3bc5154fd5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract_019ceccc-6820-70d7-b709-eb47910e9cbc" xlink:to="loc_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_019ceccc-6820-73da-bfda-8f3bc5154fd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019_019ceccc-6820-7f2d-8a88-ea9fd31e7a28" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract_019ceccc-6820-70d7-b709-eb47910e9cbc" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019_019ceccc-6820-7f2d-8a88-ea9fd31e7a28" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_019ceccc-6820-7b95-a63f-a9c2c8f66182" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract_019ceccc-6820-70d7-b709-eb47910e9cbc" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019_019ceccc-6820-7b95-a63f-a9c2c8f66182" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_VolumeWeightedAveragePrice_019ceccc-6820-7328-967e-96ef1f0cd529" xlink:href="ipx-20260630.xsd#ipx_VolumeWeightedAveragePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract_019ceccc-6820-70d7-b709-eb47910e9cbc" xlink:to="loc_ipx_VolumeWeightedAveragePrice_019ceccc-6820-7328-967e-96ef1f0cd529" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted_019ceccc-6820-7d35-ac98-7c797cd5df6f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract_019ceccc-6820-70d7-b709-eb47910e9cbc" xlink:to="loc_ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted_019ceccc-6820-7d35-ac98-7c797cd5df6f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_019ceccc-6820-7622-ba04-6bfa63423dac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_OptionsRightsAndRestrictedStockUnitsGrantedAsShareBasedPaymentsAbstract_019ceccc-6820-70d7-b709-eb47910e9cbc" xlink:to="loc_ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_019ceccc-6820-7622-ba04-6bfa63423dac" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/SEGMENTINFORMATIONScheduleofReconciliationofNoncurrentAssetsbyGeographicalLocationDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#SEGMENTINFORMATIONScheduleofReconciliationofNoncurrentAssetsbyGeographicalLocationDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/SEGMENTINFORMATIONScheduleofReconciliationofNoncurrentAssetsbyGeographicalLocationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019ceccc-6820-7064-a46c-0787799c6c7c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019ceccc-6820-7d01-b68e-751ba789aa8b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019ceccc-6820-7064-a46c-0787799c6c7c" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019ceccc-6820-7d01-b68e-751ba789aa8b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasAxis_019ceccc-6820-7a75-96dd-5529907d735d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019ceccc-6820-7d01-b68e-751ba789aa8b" xlink:to="loc_ifrs-full_GeographicalAreasAxis_019ceccc-6820-7a75-96dd-5529907d735d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_019ceccc-6820-7a75-96dd-5529907d735d_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_019ceccc-6820-7a75-96dd-5529907d735d" xlink:to="loc_ifrs-full_GeographicalAreasDomain_019ceccc-6820-7a75-96dd-5529907d735d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_019ceccc-6820-7e8d-8173-c69eca3983ae" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_019ceccc-6820-7a75-96dd-5529907d735d" xlink:to="loc_ifrs-full_GeographicalAreasDomain_019ceccc-6820-7e8d-8173-c69eca3983ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019ceccc-6820-7ffc-8a01-9a40949f727a" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_019ceccc-6820-7e8d-8173-c69eca3983ae" xlink:to="loc_country_US_019ceccc-6820-7ffc-8a01-9a40949f727a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_ReconciliationOfNonCurrentAssetsByGeographicalLocationAbstract_019ceccc-6820-785c-9ef8-c03f056356dc" xlink:href="ipx-20260630.xsd#ipx_ReconciliationOfNonCurrentAssetsByGeographicalLocationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019ceccc-6820-7064-a46c-0787799c6c7c" xlink:to="loc_ipx_ReconciliationOfNonCurrentAssetsByGeographicalLocationAbstract_019ceccc-6820-785c-9ef8-c03f056356dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets_019ceccc-6820-7226-9fd8-39d52edecffd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ipx_ReconciliationOfNonCurrentAssetsByGeographicalLocationAbstract_019ceccc-6820-785c-9ef8-c03f056356dc" xlink:to="loc_ifrs-full_NoncurrentAssets_019ceccc-6820-7226-9fd8-39d52edecffd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESCreditRiskDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESCreditRiskDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESCreditRiskDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-788f-bed3-7ab796895dfe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-77cb-829c-6e2fd44a2b03" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-788f-bed3-7ab796895dfe" xlink:to="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-77cb-829c-6e2fd44a2b03" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-775a-acce-a90c49a434b1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-77cb-829c-6e2fd44a2b03" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-775a-acce-a90c49a434b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-775a-acce-a90c49a434b1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-775a-acce-a90c49a434b1" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-775a-acce-a90c49a434b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-70b3-b5ee-52a997acabb3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-775a-acce-a90c49a434b1" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-70b3-b5ee-52a997acabb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_CashAndCashEquivalents1Member_019ceccc-68cb-7308-a82b-134aa1aadb0d" xlink:href="ipx-20260630.xsd#ipx_CashAndCashEquivalents1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-70b3-b5ee-52a997acabb3" xlink:to="loc_ipx_CashAndCashEquivalents1Member_019ceccc-68cb-7308-a82b-134aa1aadb0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeReceivablesMember_019ceccc-68cb-7485-bd92-70420453922a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-70b3-b5ee-52a997acabb3" xlink:to="loc_ifrs-full_TradeReceivablesMember_019ceccc-68cb-7485-bd92-70420453922a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7a9e-af40-b2b111ed2f76" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-77cb-829c-6e2fd44a2b03" xlink:to="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7a9e-af40-b2b111ed2f76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7a9e-af40-b2b111ed2f76_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7a9e-af40-b2b111ed2f76" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7a9e-af40-b2b111ed2f76_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-761d-a272-2a56c385e7f5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7a9e-af40-b2b111ed2f76" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-761d-a272-2a56c385e7f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditRiskMember_019ceccc-68cb-7027-8442-24eb209c7fdd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-761d-a272-2a56c385e7f5" xlink:to="loc_ifrs-full_CreditRiskMember_019ceccc-68cb-7027-8442-24eb209c7fdd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaximumExposureToCreditRisk_019ceccc-68cb-7d7d-b849-16470e450fab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaximumExposureToCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-788f-bed3-7ab796895dfe" xlink:to="loc_ifrs-full_MaximumExposureToCreditRisk_019ceccc-68cb-7d7d-b849-16470e450fab" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESNarrativeDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7917-a309-f4b35b914ae9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7145-b8dd-73ea79065814" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7917-a309-f4b35b914ae9" xlink:to="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7145-b8dd-73ea79065814" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-7229-8471-0362fe6b2d55" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7145-b8dd-73ea79065814" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-7229-8471-0362fe6b2d55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7229-8471-0362fe6b2d55_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-7229-8471-0362fe6b2d55" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7229-8471-0362fe6b2d55_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7995-9925-bb486bec594d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-7229-8471-0362fe6b2d55" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7995-9925-bb486bec594d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AllowanceForCreditLossesMember_019ceccc-68cb-7091-9165-fbc3c791e9da" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AllowanceForCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7995-9925-bb486bec594d" xlink:to="loc_ifrs-full_AllowanceForCreditLossesMember_019ceccc-68cb-7091-9165-fbc3c791e9da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7da3-a066-ba0a23d13888" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7145-b8dd-73ea79065814" xlink:to="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7da3-a066-ba0a23d13888" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7da3-a066-ba0a23d13888_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7da3-a066-ba0a23d13888" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7da3-a066-ba0a23d13888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7ef9-b693-87df3a42ac2f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7da3-a066-ba0a23d13888" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7ef9-b693-87df3a42ac2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditRiskMember_019ceccc-68cb-7e79-8789-9a9934212415" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7ef9-b693-87df3a42ac2f" xlink:to="loc_ifrs-full_CreditRiskMember_019ceccc-68cb-7e79-8789-9a9934212415" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateRiskMember_019ceccc-68cb-7a4f-a49b-edd732a5f933" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7ef9-b693-87df3a42ac2f" xlink:to="loc_ifrs-full_InterestRateRiskMember_019ceccc-68cb-7a4f-a49b-edd732a5f933" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CommodityPriceRiskMember_019ceccc-68cb-731b-b2d0-299e2c86ec6f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CommodityPriceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7ef9-b693-87df3a42ac2f" xlink:to="loc_ifrs-full_CommodityPriceRiskMember_019ceccc-68cb-731b-b2d0-299e2c86ec6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis_019ceccc-68cb-740f-94cb-737226806729" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7145-b8dd-73ea79065814" xlink:to="loc_ifrs-full_TypesOfInterestRatesAxis_019ceccc-68cb-740f-94cb-737226806729" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019ceccc-68cb-740f-94cb-737226806729_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019ceccc-68cb-740f-94cb-737226806729" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019ceccc-68cb-740f-94cb-737226806729_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019ceccc-68cb-79df-9373-c6197b7e2438" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019ceccc-68cb-740f-94cb-737226806729" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019ceccc-68cb-79df-9373-c6197b7e2438" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FloatingInterestRateMember_019ceccc-68cb-7afe-a382-4b9a80af38ca" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FloatingInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInterestRatesDomain_019ceccc-68cb-79df-9373-c6197b7e2438" xlink:to="loc_ifrs-full_FloatingInterestRateMember_019ceccc-68cb-7afe-a382-4b9a80af38ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaximumExposureToCreditRisk_019ceccc-68cb-713e-a452-842fb09a09e3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaximumExposureToCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7917-a309-f4b35b914ae9" xlink:to="loc_ifrs-full_MaximumExposureToCreditRisk_019ceccc-68cb-713e-a452-842fb09a09e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariablePercent_019ceccc-68cb-773b-b4ce-c83d1e235461" xlink:href="ipx-20260630.xsd#ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariablePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7917-a309-f4b35b914ae9" xlink:to="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariablePercent_019ceccc-68cb-773b-b4ce-c83d1e235461" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableBasisPoints_019ceccc-68cb-730b-814c-e5702aa30f0e" xlink:href="ipx-20260630.xsd#ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableBasisPoints"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7917-a309-f4b35b914ae9" xlink:to="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableBasisPoints_019ceccc-68cb-730b-814c-e5702aa30f0e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic_019ceccc-68cb-7ed4-9f8e-8819f0dd8039" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7917-a309-f4b35b914ae9" xlink:to="loc_ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic_019ceccc-68cb-7ed4-9f8e-8819f0dd8039" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESInterestRateRiskInterestRateProfileDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESInterestRateRiskInterestRateProfileDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESInterestRateRiskInterestRateProfileDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-77eb-b726-508f241af628" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7c86-a1dd-494d922ef413" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-77eb-b726-508f241af628" xlink:to="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7c86-a1dd-494d922ef413" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7dcd-8b13-01b6aa94476a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7c86-a1dd-494d922ef413" xlink:to="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7dcd-8b13-01b6aa94476a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7dcd-8b13-01b6aa94476a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7dcd-8b13-01b6aa94476a" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7dcd-8b13-01b6aa94476a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-78e5-aef8-87a30973f21a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7dcd-8b13-01b6aa94476a" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-78e5-aef8-87a30973f21a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateRiskMember_019ceccc-68cb-70cf-83d8-c40b55a6d31b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-78e5-aef8-87a30973f21a" xlink:to="loc_ifrs-full_InterestRateRiskMember_019ceccc-68cb-70cf-83d8-c40b55a6d31b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic_019ceccc-68cb-7054-b67d-2a58e1ed7e56" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-77eb-b726-508f241af628" xlink:to="loc_ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic_019ceccc-68cb-7054-b67d-2a58e1ed7e56" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESInterestRateRiskInterestRateSensitivityDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESInterestRateRiskInterestRateSensitivityDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESInterestRateRiskInterestRateSensitivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7417-9957-66aa77011612" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-77d8-876b-f04b59cf0417" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7417-9957-66aa77011612" xlink:to="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-77d8-876b-f04b59cf0417" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7f34-a1ed-7125574384cf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-77d8-876b-f04b59cf0417" xlink:to="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7f34-a1ed-7125574384cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7f34-a1ed-7125574384cf_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7f34-a1ed-7125574384cf" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7f34-a1ed-7125574384cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7429-ab18-0fd768735c97" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7f34-a1ed-7125574384cf" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7429-ab18-0fd768735c97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_InterestRateRiskIncreaseMember_019ceccc-68cb-79c5-8ada-fea212ebdfdc" xlink:href="ipx-20260630.xsd#ipx_InterestRateRiskIncreaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7429-ab18-0fd768735c97" xlink:to="loc_ipx_InterestRateRiskIncreaseMember_019ceccc-68cb-79c5-8ada-fea212ebdfdc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_InterestRateRiskDecreaseMember_019ceccc-68cb-70e9-be4d-91f379620a43" xlink:href="ipx-20260630.xsd#ipx_InterestRateRiskDecreaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7429-ab18-0fd768735c97" xlink:to="loc_ipx_InterestRateRiskDecreaseMember_019ceccc-68cb-70e9-be4d-91f379620a43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEarnings_019ceccc-68cb-7385-b812-401dfed1091e" xlink:href="ipx-20260630.xsd#ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7417-9957-66aa77011612" xlink:to="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEarnings_019ceccc-68cb-7385-b812-401dfed1091e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEquity_019ceccc-68cb-73c2-b29d-dc9b3c7978bd" xlink:href="ipx-20260630.xsd#ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7417-9957-66aa77011612" xlink:to="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEquity_019ceccc-68cb-73c2-b29d-dc9b3c7978bd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESForeignCurrencyRiskExposureDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESForeignCurrencyRiskExposureDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESForeignCurrencyRiskExposureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-70f0-922a-e6ebe5909965" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7ed3-8c73-105924e23bbb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-70f0-922a-e6ebe5909965" xlink:to="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7ed3-8c73-105924e23bbb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_019ceccc-68cb-7064-bd56-99439f612977" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7ed3-8c73-105924e23bbb" xlink:to="loc_srt_CurrencyAxis_019ceccc-68cb-7064-bd56-99439f612977" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019ceccc-68cb-7064-bd56-99439f612977_default" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_019ceccc-68cb-7064-bd56-99439f612977" xlink:to="loc_currency_AllCurrenciesDomain_019ceccc-68cb-7064-bd56-99439f612977_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019ceccc-68cb-7584-b5b0-48b590d5d91a" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_019ceccc-68cb-7064-bd56-99439f612977" xlink:to="loc_currency_AllCurrenciesDomain_019ceccc-68cb-7584-b5b0-48b590d5d91a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AUD_019ceccc-68cb-7092-97b0-82fea62dfbc0" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AUD"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019ceccc-68cb-7584-b5b0-48b590d5d91a" xlink:to="loc_currency_AUD_019ceccc-68cb-7092-97b0-82fea62dfbc0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-7d26-bb0c-5c1d802b0c91" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7ed3-8c73-105924e23bbb" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-7d26-bb0c-5c1d802b0c91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7d26-bb0c-5c1d802b0c91_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-7d26-bb0c-5c1d802b0c91" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7d26-bb0c-5c1d802b0c91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7280-bfce-0e78b4015f0f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_019ceccc-68cb-7d26-bb0c-5c1d802b0c91" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7280-bfce-0e78b4015f0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_CashAndCashEquivalents1Member_019ceccc-68cb-7b15-8631-e00b4daeb963" xlink:href="ipx-20260630.xsd#ipx_CashAndCashEquivalents1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7280-bfce-0e78b4015f0f" xlink:to="loc_ipx_CashAndCashEquivalents1Member_019ceccc-68cb-7b15-8631-e00b4daeb963" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_TradeAndOtherPayablesMember_019ceccc-68cb-715c-84e0-99209989cf71" xlink:href="ipx-20260630.xsd#ipx_TradeAndOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_019ceccc-68cb-7280-bfce-0e78b4015f0f" xlink:to="loc_ipx_TradeAndOtherPayablesMember_019ceccc-68cb-715c-84e0-99209989cf71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7678-9c95-a2f3a9e24053" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-7ed3-8c73-105924e23bbb" xlink:to="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7678-9c95-a2f3a9e24053" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7678-9c95-a2f3a9e24053_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7678-9c95-a2f3a9e24053" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7678-9c95-a2f3a9e24053_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7cda-9113-c1626f963dd1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7678-9c95-a2f3a9e24053" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7cda-9113-c1626f963dd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrencyRiskMember_019ceccc-68cb-7a76-aa65-2e6ad40979fd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrencyRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7cda-9113-c1626f963dd1" xlink:to="loc_ifrs-full_CurrencyRiskMember_019ceccc-68cb-7a76-aa65-2e6ad40979fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic_019ceccc-68cb-7517-a47a-ef07fd05bd42" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-70f0-922a-e6ebe5909965" xlink:to="loc_ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic_019ceccc-68cb-7517-a47a-ef07fd05bd42" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESForeignCurrencyRiskForeignExchangeRateSensitivityDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESForeignCurrencyRiskForeignExchangeRateSensitivityDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/FINANCIALRISKMANAGEMENTOBJECTIVESANDPOLICIESForeignCurrencyRiskForeignExchangeRateSensitivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7584-be9f-131667010245" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-75af-8f6d-2085da6643e7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7584-be9f-131667010245" xlink:to="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-75af-8f6d-2085da6643e7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis_019ceccc-68cb-731e-a091-95bcf59f6caf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CurrencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-75af-8f6d-2085da6643e7" xlink:to="loc_srt_CurrencyAxis_019ceccc-68cb-731e-a091-95bcf59f6caf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019ceccc-68cb-731e-a091-95bcf59f6caf_default" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CurrencyAxis_019ceccc-68cb-731e-a091-95bcf59f6caf" xlink:to="loc_currency_AllCurrenciesDomain_019ceccc-68cb-731e-a091-95bcf59f6caf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain_019ceccc-68cb-71cd-a543-b85f66089e1a" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AllCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CurrencyAxis_019ceccc-68cb-731e-a091-95bcf59f6caf" xlink:to="loc_currency_AllCurrenciesDomain_019ceccc-68cb-71cd-a543-b85f66089e1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AUD_019ceccc-68cb-7372-b371-7cc0a843d4e8" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AUD"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_currency_AllCurrenciesDomain_019ceccc-68cb-71cd-a543-b85f66089e1a" xlink:to="loc_currency_AUD_019ceccc-68cb-7372-b371-7cc0a843d4e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7996-a527-7566981c274b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_019ceccc-68cb-75af-8f6d-2085da6643e7" xlink:to="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7996-a527-7566981c274b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7996-a527-7566981c274b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7996-a527-7566981c274b" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7996-a527-7566981c274b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7417-bbad-d9d67096371f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_019ceccc-68cb-7996-a527-7566981c274b" xlink:to="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7417-bbad-d9d67096371f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_CurrencyRiskIncreaseMember_019ceccc-68cb-742e-bc44-a99c8b75e7bb" xlink:href="ipx-20260630.xsd#ipx_CurrencyRiskIncreaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7417-bbad-d9d67096371f" xlink:to="loc_ipx_CurrencyRiskIncreaseMember_019ceccc-68cb-742e-bc44-a99c8b75e7bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_CurrencyRiskDecreaseMember_019ceccc-68cb-7d5f-8e0a-342a832eb0cf" xlink:href="ipx-20260630.xsd#ipx_CurrencyRiskDecreaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_019ceccc-68cb-7417-bbad-d9d67096371f" xlink:to="loc_ipx_CurrencyRiskDecreaseMember_019ceccc-68cb-7d5f-8e0a-342a832eb0cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEarnings_019ceccc-68cb-751c-a8b1-f0cad078eae2" xlink:href="ipx-20260630.xsd#ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7584-be9f-131667010245" xlink:to="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEarnings_019ceccc-68cb-751c-a8b1-f0cad078eae2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEquity_019ceccc-68cb-7405-8504-ae3d6bb7e4d6" xlink:href="ipx-20260630.xsd#ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_019ceccc-68cb-7584-be9f-131667010245" xlink:to="loc_ipx_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEquity_019ceccc-68cb-7405-8504-ae3d6bb7e4d6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/CONTINGENTASSETSANDLIABILITIESDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#CONTINGENTASSETSANDLIABILITIESDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/CONTINGENTASSETSANDLIABILITIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-68cb-71bc-a1e6-6e24cc0d3e4e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInvestmentPropertyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInvestmentPropertyTable_019ceccc-68cb-760c-85d1-39af4a5d6d8b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInvestmentPropertyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-68cb-71bc-a1e6-6e24cc0d3e4e" xlink:to="loc_ifrs-full_DisclosureOfInvestmentPropertyTable_019ceccc-68cb-760c-85d1-39af4a5d6d8b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-68cb-7240-bfef-7eb6f747b67d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInvestmentPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyTable_019ceccc-68cb-760c-85d1-39af4a5d6d8b" xlink:to="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-68cb-7240-bfef-7eb6f747b67d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-68cb-7240-bfef-7eb6f747b67d_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInvestmentPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-68cb-7240-bfef-7eb6f747b67d" xlink:to="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-68cb-7240-bfef-7eb6f747b67d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-68cb-7cd4-b0d1-466d76273933" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInvestmentPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInvestmentPropertyAxis_019ceccc-68cb-7240-bfef-7eb6f747b67d" xlink:to="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-68cb-7cd4-b0d1-466d76273933" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_TitanProjectMember_019ceccc-68cb-7c19-a2a9-52cbdb0ad042" xlink:href="ipx-20260630.xsd#ipx_TitanProjectMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInvestmentPropertyDomain_019ceccc-68cb-7cd4-b0d1-466d76273933" xlink:to="loc_ipx_TitanProjectMember_019ceccc-68cb-7c19-a2a9-52cbdb0ad042" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0a524-8e84-7525-b69e-543aaefd5fa5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyTable_019ceccc-68cb-760c-85d1-39af4a5d6d8b" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0a524-8e84-7525-b69e-543aaefd5fa5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a524-8e84-7525-b69e-543aaefd5fa5_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0a524-8e84-7525-b69e-543aaefd5fa5" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a524-8e84-7525-b69e-543aaefd5fa5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a524-8e84-7fad-bb75-a2f8e5a2ec91" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0a524-8e84-7525-b69e-543aaefd5fa5" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a524-8e84-7fad-bb75-a2f8e5a2ec91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorPurchasesOfAssetsMember_01a0a525-4023-7bb8-82ac-9903de124bfe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorPurchasesOfAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a524-8e84-7fad-bb75-a2f8e5a2ec91" xlink:to="loc_ifrs-full_MajorPurchasesOfAssetsMember_01a0a525-4023-7bb8-82ac-9903de124bfe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLand_019ceccc-68cb-7af6-98ce-613696631f8a" xlink:href="ipx-20260630.xsd#ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLand"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-68cb-71bc-a1e6-6e24cc0d3e4e" xlink:to="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLand_019ceccc-68cb-7af6-98ce-613696631f8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandOwned_019ceccc-68cb-7232-8a49-7e3b0b5c0fe9" xlink:href="ipx-20260630.xsd#ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandOwned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-68cb-71bc-a1e6-6e24cc0d3e4e" xlink:to="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandOwned_019ceccc-68cb-7232-8a49-7e3b0b5c0fe9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToLongTermLease_019ceccc-68cb-7f0b-9d9f-ba44523a9a6f" xlink:href="ipx-20260630.xsd#ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToLongTermLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-68cb-71bc-a1e6-6e24cc0d3e4e" xlink:to="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToLongTermLease_019ceccc-68cb-7f0b-9d9f-ba44523a9a6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToExclusiveOptionAgreements_019ceccc-68cb-7e8d-b077-2984484a5044" xlink:href="ipx-20260630.xsd#ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToExclusiveOptionAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-68cb-71bc-a1e6-6e24cc0d3e4e" xlink:to="loc_ipx_AssetsArisingFromExplorationForAndEvaluationOfMineralResourcesAreaOfLandSubjectToExclusiveOptionAgreements_019ceccc-68cb-7e8d-b077-2984484a5044" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetAcquisitionAreaOfOwnedProperty_01a0af19-9f03-714f-b0bf-10309ce0a62e" xlink:href="ipx-20260630.xsd#ipx_AssetAcquisitionAreaOfOwnedProperty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-68cb-71bc-a1e6-6e24cc0d3e4e" xlink:to="loc_ipx_AssetAcquisitionAreaOfOwnedProperty_01a0af19-9f03-714f-b0bf-10309ce0a62e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetAcquisitionAreaOfLease_01a0af19-9f03-7f22-a477-b7b3fb7927e9" xlink:href="ipx-20260630.xsd#ipx_AssetAcquisitionAreaOfLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-68cb-71bc-a1e6-6e24cc0d3e4e" xlink:to="loc_ipx_AssetAcquisitionAreaOfLease_01a0af19-9f03-7f22-a477-b7b3fb7927e9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_01a048be-268a-7370-be9e-64f89c70a93b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyLineItems_019ceccc-68cb-71bc-a1e6-6e24cc0d3e4e" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_01a048be-268a-7370-be9e-64f89c70a93b" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://iperionx.com/role/EVENTSSUBSEQUENTTOBALANCEDATEDetails" xlink:type="simple" xlink:href="ipx-20260630.xsd#EVENTSSUBSEQUENTTOBALANCEDATEDetails"/>
  <link:definitionLink xlink:role="http://iperionx.com/role/EVENTSSUBSEQUENTTOBALANCEDATEDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a0a56b-4142-781e-bf8d-89ff61cbad7b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a0a56b-4142-7abf-9a8f-6df9b4e3bfae" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a0a56b-4142-781e-bf8d-89ff61cbad7b" xlink:to="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a0a56b-4142-7abf-9a8f-6df9b4e3bfae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0a56b-4142-781c-a863-4628b6b418f2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a0a56b-4142-7abf-9a8f-6df9b4e3bfae" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0a56b-4142-781c-a863-4628b6b418f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a56b-4142-781c-a863-4628b6b418f2_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0a56b-4142-781c-a863-4628b6b418f2" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a56b-4142-781c-a863-4628b6b418f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a56b-4142-72a8-9740-e05a9d4897c9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a0a56b-4142-781c-a863-4628b6b418f2" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a56b-4142-72a8-9740-e05a9d4897c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorPurchasesOfAssetsMember_01a0af17-4dcc-7e25-ab3b-c3e3b181e4a9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorPurchasesOfAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a56b-4142-72a8-9740-e05a9d4897c9" xlink:to="loc_ifrs-full_MajorPurchasesOfAssetsMember_01a0af17-4dcc-7e25-ab3b-c3e3b181e4a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SharePlacementMember_01a0a56b-8e16-77eb-83fe-5cde6c2f701b" xlink:href="ipx-20260630.xsd#ipx_SharePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a56b-4142-72a8-9740-e05a9d4897c9" xlink:to="loc_ipx_SharePlacementMember_01a0a56b-8e16-77eb-83fe-5cde6c2f701b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_GovernmentGrantsMember_01a0af37-5d55-7ae2-b961-65727f677b09" xlink:href="ipx-20260630.xsd#ipx_GovernmentGrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a0a56b-4142-72a8-9740-e05a9d4897c9" xlink:to="loc_ipx_GovernmentGrantsMember_01a0af37-5d55-7ae2-b961-65727f677b09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfContractsAxis_01a0af35-6910-76e3-9a37-6da7d44933e7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfContractsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a0a56b-4142-7abf-9a8f-6df9b4e3bfae" xlink:to="loc_ifrs-full_TypesOfContractsAxis_01a0af35-6910-76e3-9a37-6da7d44933e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfContractsDomain_01a0af35-6910-76e3-9a37-6da7d44933e7_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfContractsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfContractsAxis_01a0af35-6910-76e3-9a37-6da7d44933e7" xlink:to="loc_ifrs-full_TypesOfContractsDomain_01a0af35-6910-76e3-9a37-6da7d44933e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfContractsDomain_01a0af35-6910-71d7-ad23-7e7a0c4ef9d1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfContractsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfContractsAxis_01a0af35-6910-76e3-9a37-6da7d44933e7" xlink:to="loc_ifrs-full_TypesOfContractsDomain_01a0af35-6910-71d7-ad23-7e7a0c4ef9d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember_01a0af35-6910-79e1-b46c-c9838902ccb1" xlink:href="ipx-20260630.xsd#ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfContractsDomain_01a0af35-6910-71d7-ad23-7e7a0c4ef9d1" xlink:to="loc_ipx_SmallBusinessInnovationResearchSBIRFundingProgramMember_01a0af35-6910-79e1-b46c-c9838902ccb1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_01a0b567-5eff-78b5-90b3-5840b1590b5b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a0a56b-4142-781e-bf8d-89ff61cbad7b" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_01a0b567-5eff-78b5-90b3-5840b1590b5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetAcquisitionAreaOfOwnedProperty_01a0b567-5eff-73fe-b0a5-0e7afbcb341d" xlink:href="ipx-20260630.xsd#ipx_AssetAcquisitionAreaOfOwnedProperty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a0a56b-4142-781e-bf8d-89ff61cbad7b" xlink:to="loc_ipx_AssetAcquisitionAreaOfOwnedProperty_01a0b567-5eff-73fe-b0a5-0e7afbcb341d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_AssetAcquisitionAreaOfLease_01a0b567-5eff-7cad-b3b9-d183fe05404d" xlink:href="ipx-20260630.xsd#ipx_AssetAcquisitionAreaOfLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a0a56b-4142-781e-bf8d-89ff61cbad7b" xlink:to="loc_ipx_AssetAcquisitionAreaOfLease_01a0b567-5eff-7cad-b3b9-d183fe05404d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SaleOfStockNumberOfSharesAuthorizedInTransaction_01a0b567-5eff-74fe-a423-b81ad8921e68" xlink:href="ipx-20260630.xsd#ipx_SaleOfStockNumberOfSharesAuthorizedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a0a56b-4142-781e-bf8d-89ff61cbad7b" xlink:to="loc_ipx_SaleOfStockNumberOfSharesAuthorizedInTransaction_01a0b567-5eff-74fe-a423-b81ad8921e68" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SaleOfStockDepositarySharesEquivalentOrdinaryShares_01a0b567-5eff-786e-99da-5abf5f731af6" xlink:href="ipx-20260630.xsd#ipx_SaleOfStockDepositarySharesEquivalentOrdinaryShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a0a56b-4142-781e-bf8d-89ff61cbad7b" xlink:to="loc_ipx_SaleOfStockDepositarySharesEquivalentOrdinaryShares_01a0b567-5eff-786e-99da-5abf5f731af6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ipx_SaleOfStockGrossProceedsFromSaleOfOrdinaryShares_01a0b567-5eff-7ccf-b90d-6d1ff570afec" xlink:href="ipx-20260630.xsd#ipx_SaleOfStockGrossProceedsFromSaleOfOrdinaryShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a0a56b-4142-781e-bf8d-89ff61cbad7b" xlink:to="loc_ipx_SaleOfStockGrossProceedsFromSaleOfOrdinaryShares_01a0b567-5eff-7ccf-b90d-6d1ff570afec" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GovernmentGrants_01a0b567-74f6-7233-b2b8-316b7aeabc9a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GovernmentGrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a0a56b-4142-781e-bf8d-89ff61cbad7b" xlink:to="loc_ifrs-full_GovernmentGrants_01a0b567-74f6-7233-b2b8-316b7aeabc9a" xlink:type="arc" order="6"/>
  </link:definitionLink>
</link:linkbase>
