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    <isConfidential>false</isConfidential>
    <filerInfo>

      <filer>
        <issuerCredentials>
          <cik>0000861929</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000001018</seriesId>
        <classId>C000002772</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
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      <regName>DIMENSIONAL INVESTMENT GROUP INC</regName>
      <regFileNumber>811-06067</regFileNumber>
      <regCik>0000861929</regCik>
      <regLei>549300HU43AV2FC6L876</regLei>
      <regStreet1>6300 BEE CAVE ROAD</regStreet1>
      <regStreet2>BUILDING ONE</regStreet2>
      <regCity>AUSTIN</regCity>
      <regStateConditional regCountry="US" regState="US-TX"/>
      <regZipOrPostalCode>78746</regZipOrPostalCode>
      <regPhone>512-306-7400</regPhone>
      <seriesName>GLOBAL ALLOCATION 25/75 PORTFOLIO</seriesName>
      <seriesId>S000001018</seriesId>
      <seriesLei>549300WYPW8XRGSQKG66</seriesLei>
      <repPdEnd>2025-10-31</repPdEnd>
      <repPdDate>2025-10-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
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      <totLiabs>50808.28</totLiabs>
      <netAssets>666657164.43</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0.00000000</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
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      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>0.00000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
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        </monthlyTotReturns>
        <othMon1 netRealizedGain="2797629.12000000" netUnrealizedAppr="4529662.54000000"/>
        <othMon2 netRealizedGain="2017430.81000000" netUnrealizedAppr="-537840.49000000"/>
        <othMon3 netRealizedGain="-23727.55000000" netUnrealizedAppr="2953164.57000000"/>
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    </fundInfo>
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        <name>DFA International Real Estate Securities</name>
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        <fairValLevel>1</fairValLevel>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>DFA Inflation Protected Securities Portfolio</name>
        <lei>549300TG645KDIW1X492</lei>
        <title>DFA Inflation-Protected Securities Portfolio</title>
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        <fairValLevel>1</fairValLevel>
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        <name>International Core Equity 2 Portfolio</name>
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        <title>International Core Equity 2 Portfolio</title>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>DFA US Core Equity 2 Portfolio</name>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA US Core Equity 1 Portfolio</name>
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        <title>U.S. Core Equity 1 Portfolio</title>
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        <identifiers>
          <isin value="US2332034139"/>
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        <curCd>USD</curCd>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
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          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Emerging Markets Core Equity 2 Portfolio</name>
        <lei>549300JF8HO6EL9ROR31</lei>
        <title>Emerging Markets Core Equity 2 Portfolio</title>
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        <curCd>USD</curCd>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA Two-Year Global Fixed Income Portfolio</name>
        <lei>549300PFM0BC0V0V1O39</lei>
        <title>DFA Two-Year Global Fixed Income Portfolio</title>
        <cusip>233203645</cusip>
        <identifiers>
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        <fairValLevel>1</fairValLevel>
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      </invstOrSec>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA World ex US Government Fixed Income Portfolio</name>
        <lei>5493001KSJU4MGHNS208</lei>
        <title>DFA World ex U.S. Government Fixed Income Portfolio</title>
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          <isin value="US23320G3231"/>
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        <units>NS</units>
        <curCd>USD</curCd>
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        <pctVal>3.984038031408</pctVal>
        <payoffProfile>Long</payoffProfile>
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        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA Short-Term Extended Quality Portfolio</name>
        <lei>549300UKO8H5DQFJFW90</lei>
        <title>DFA Short-Term Extended Quality Portfolio</title>
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          <isin value="US23320G5210"/>
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        <balance>19096626.94000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>200132650.34000000</valUSD>
        <pctVal>30.02032544135</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>State Street Global Advisors</name>
        <lei>549300BZ5TGIFZUZDZ37</lei>
        <title>State Street Institutional U.S. Government Money Market Fund</title>
        <cusip>857492706</cusip>
        <identifiers>
          <isin value="US8574927062"/>
        </identifiers>
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        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>47271.85000000</valUSD>
        <pctVal>0.007090878568</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="Monthly returns presented in Item B.5(a) have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2025-11-19</ncom:dateSigned>
      <ncom:nameOfApplicant>DIMENSIONAL INVESTMENT GROUP INC</ncom:nameOfApplicant>
      <ncom:signature>Randy Olson</ncom:signature>
      <ncom:signerName>Randy Olson</ncom:signerName>
      <ncom:title>Vice President</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
