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      <filer>
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          <ccc>XXXXXXXX</ccc>
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      <seriesClassInfo>
        <seriesId>S000055975</seriesId>
        <classId>C000176269</classId>
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    </filerInfo>
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      <regFileNumber>811-03258</regFileNumber>
      <regCik>0000355437</regCik>
      <regLei>549300XGRTBJCE41BD26</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>
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      <seriesId>S000055975</seriesId>
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      <repPdEnd>2026-10-31</repPdEnd>
      <repPdDate>2026-07-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
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      <totLiabs>128010.96</totLiabs>
      <netAssets>150125659.99</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
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      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>25.09000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
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        <name>DFA US Small Cap Portfolio</name>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
        <lei>54930006OMTUF18TBS36</lei>
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        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAE_MASTER"/>
        </identifiers>
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        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4490204.56000000</valUSD>
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        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>N/A</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
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        <identifiers>
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        <fairValLevel>N/A</fairValLevel>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
        <lei>549300CBGM4U9R4DEL16</lei>
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        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAH_MASTER"/>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>N/A</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
        <lei>549300FCYEDRJO2L0O02</lei>
        <title>THE UNITED KINGDOM SMALL COMPANY SERIES</title>
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        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAI_MASTER"/>
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        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>N/A</fairValLevel>
        <securityLending>
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      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
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        <curCd>USD</curCd>
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        <invCountry>US</invCountry>
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        <fairValLevel>N/A</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Dimensional Fund Advisors</name>
        <lei>5493003AI5702G3MYM49</lei>
        <title>THE EMERGING MARKETS SMALL CAP SERIES</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="DFAL_MASTER"/>
        </identifiers>
        <balance>142050.29000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>17729297.02000000</valUSD>
        <pctVal>11.80963802002</pctVal>
        <payoffProfile>Long</payoffProfile>
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        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>
        
        <fairValLevel>N/A</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      </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>2026-08-31</ncom:dateSigned>
      <ncom:nameOfApplicant>DFA INVESTMENT DIMENSIONS GROUP INC</ncom:nameOfApplicant>
      <ncom:signature>Randy Olson</ncom:signature>
      <ncom:signerName>Randy Olson</ncom:signerName>
      <ncom:title>Vice President</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
