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    <filerInfo>

      <filer>
        <issuerCredentials>
          <cik>0000355437</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000050937</seriesId>
        <classId>C000160537</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
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      <regName>DFA INVESTMENT DIMENSIONS GROUP INC</regName>
      <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>
      <seriesName>DIMENSIONAL 2025 TARGET DATE RETIREMENT INCOME FUND</seriesName>
      <seriesId>S000050937</seriesId>
      <seriesLei>5493001ZQVKYSSUXKG71</seriesLei>
      <repPdEnd>2026-10-31</repPdEnd>
      <repPdDate>2026-07-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
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      <totLiabs>13546.75</totLiabs>
      <netAssets>102893839.26</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>
      <amtPayAftOneYrCtrldComp>0.00000000</amtPayAftOneYrCtrldComp>
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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>
          <monthlyTotReturn classId="C000160537" rtn1="1.47000000" rtn2="-0.41000000" rtn3="-1.48000000"/>
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        <othMon2 netRealizedGain="-53806.55000000" netUnrealizedAppr="-2317548.70000000"/>
        <othMon3 netRealizedGain="640080.60000000" netUnrealizedAppr="-2176234.12000000"/>
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      <mon1Flow redemption="3596890.97000000" reinvestment="0.00000000" sales="826569.84000000"/>
      <mon2Flow redemption="1899411.88000000" reinvestment="1805041.59000000" sales="802853.94000000"/>
      <mon3Flow redemption="5428797.81000000" reinvestment="0.00000000" sales="851588.17000000"/>


    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>DFA Inflation Protected Securities Portfolio</name>
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        <title>DFA Inflation-Protected Securities Portfolio</title>
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        <payoffProfile>Long</payoffProfile>
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        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>International Core Equity 2 Portfolio</name>
        <lei>5493006PNAH8EX4MI695</lei>
        <title>International Core Equity 2 Portfolio</title>
        <cusip>233203371</cusip>
        <identifiers>
          <isin value="US2332033719"/>
        </identifiers>
        <balance>73021.71000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1640067.65000000</valUSD>
        <pctVal>1.593941543823</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>DFA US Core Equity 1 Portfolio</name>
        <lei>549300HFCYX77UDJN369</lei>
        <title>U.S. Core Equity 1 Portfolio</title>
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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>
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      </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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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>
      <invstOrSec>
        <name>DFA Large Cap International Portfolio</name>
        <lei>549300YQLH5F7D7ZFY39</lei>
        <title>Large Cap International Portfolio</title>
        <cusip>233203868</cusip>
        <identifiers>
          <isin value="US2332038684"/>
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        <balance>85382.13000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
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        <pctVal>3.193930845262</pctVal>
        <payoffProfile>Long</payoffProfile>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>DFA LTIP Portfolio</name>
        <lei>5493002LL7DG39YNJG30</lei>
        <title>DFA LTIP Portfolio</title>
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          <isin value="US25239Y8738"/>
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        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>18571704.91000000</valUSD>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>DFA US Large Company Portfolio</name>
        <lei>549300FK54SMFUX28R78</lei>
        <title>U.S. Large Company Portfolio</title>
        <cusip>25434D823</cusip>
        <identifiers>
          <isin value="US25434D8231"/>
        </identifiers>
        <balance>187287.11000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>9315660.85000000</valUSD>
        <pctVal>9.053662412635</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>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>
