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        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://ioneer.com/role/EquityReservesTables" id="EquityReservesTables">
        <!--Parent Role: Equity - reserves-->
        <link:definition>081900 - Disclosure - Equity - reserves (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/EquityAccumulatedLossesTables" id="EquityAccumulatedLossesTables">
        <!--Parent Role: Equity - accumulated losses-->
        <link:definition>082000 - Disclosure - Equity - accumulated losses (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/FinancialInstrumentsTables" id="FinancialInstrumentsTables">
        <!--Parent Role: Financial instruments-->
        <link:definition>082200 - Disclosure - Financial instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://ioneer.com/role/EmployeeBenefitsExpensedTables" id="EmployeeBenefitsExpensedTables">
        <!--Parent Role: Employee benefits expensed-->
        <link:definition>082300 - Disclosure - Employee benefits expensed (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://ioneer.com/role/KeyManagementPersonnelDisclosuresTables" id="KeyManagementPersonnelDisclosuresTables">
        <!--Parent Role: Key management personnel disclosures-->
        <link:definition>082400 - Disclosure - Key management personnel disclosures (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://ioneer.com/role/EarningsPerShareTables" id="EarningsPerShareTables">
        <!--Parent Role: Earnings per share-->
        <link:definition>082500 - Disclosure - Earnings per share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/SharebasedPaymentsTables" id="SharebasedPaymentsTables">
        <!--Parent Role: Share-based payments-->
        <link:definition>082600 - Disclosure - Share-based payments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://ioneer.com/role/ParentEntityDisclosuresTables" id="ParentEntityDisclosuresTables">
        <!--Parent Role: Parent entity disclosures-->
        <link:definition>082700 - Disclosure - Parent entity disclosures (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://ioneer.com/role/ControlledEntitiesTables" id="ControlledEntitiesTables">
        <!--Parent Role: Controlled entities-->
        <link:definition>082800 - Disclosure - Controlled entities (Tables)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://ioneer.com/role/CapitalAndOtherCommitmentsTables" id="CapitalAndOtherCommitmentsTables">
        <!--Parent Role: Capital and other commitments-->
        <link:definition>082900 - Disclosure - Capital and other commitments (Tables)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/OperatingSegmentsDetails" id="OperatingSegmentsDetails">
        <!--Parent Role: Operating segments-->
        <link:definition>090200 - Disclosure - Operating segments (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>090400 - Disclosure - Net finance income (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://ioneer.com/role/IncomeTaxExpenseDeferredTaxDetails" id="IncomeTaxExpenseDeferredTaxDetails">
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/IncomeTaxExpenseNonrecognisedTaxLossesDetails" id="IncomeTaxExpenseNonrecognisedTaxLossesDetails">
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/CurrentAssetsCashAndCashEquivalentsDetails" id="CurrentAssetsCashAndCashEquivalentsDetails">
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/ReconciliationOfLossAfterIncomeTaxToNetCashUsedInOperatingActivitiesDetails" id="ReconciliationOfLossAfterIncomeTaxToNetCashUsedInOperatingActivitiesDetails">
        <!--Parent Role: Reconciliation of loss after income tax to net cash used in operating activities-->
        <link:definition>090700 - Disclosure - Reconciliation of loss after income tax to net cash used in operating activities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/CurrentAssetsReceivablesDetails" id="CurrentAssetsReceivablesDetails">
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/CurrentLiabilitiesProvisionsDetails" id="CurrentLiabilitiesProvisionsDetails">
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        <link:definition>091600 - Disclosure - Current liabilities - provisions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://ioneer.com/role/NoncurrentLiabilitiesLeaseLiabilitiesDetails" id="NoncurrentLiabilitiesLeaseLiabilitiesDetails">
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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