<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/nport" xmlns:com="http://www.sec.gov/edgar/common" xmlns:ncom="http://www.sec.gov/edgar/nportcommon" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sec.gov/edgar/nport eis_NPORT_Filer.xsd">
  <headerData>
    <submissionType>NPORT-P</submissionType>
    <isConfidential>false</isConfidential>
    <filerInfo>

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


      <seriesClassInfo>
        <seriesId>S000066958</seriesId>
        <classId>C000215528</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
  <formData>
    <genInfo>
      <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>Global Social Core Equity Portfolio</seriesName>
      <seriesId>S000066958</seriesId>
      <seriesLei>5493008ZOHBZZSFU7Z17</seriesLei>
      <repPdEnd>2026-10-31</repPdEnd>
      <repPdDate>2026-01-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>89303805.63</totAssets>
      <totLiabs>5476.26</totLiabs>
      <netAssets>89298329.37</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>
      <amtPayAftOneYrOthAffil>0.00000000</amtPayAftOneYrOthAffil>
      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>21.19000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000215528" rtn1="0.46000000" rtn2="1.48000000" rtn3="3.64000000"/>
        </monthlyTotReturns>
        <othMon1 netRealizedGain="0.00000000" netUnrealizedAppr="389083.06000000"/>
        <othMon2 netRealizedGain="177.28000000" netUnrealizedAppr="745764.32000000"/>
        <othMon3 netRealizedGain="18679.92000000" netUnrealizedAppr="3088973.31000000"/>
      </returnInfo>
      <mon1Flow redemption="91441.70000000" reinvestment="0.00000000" sales="220243.26000000"/>
      <mon2Flow redemption="487766.48000000" reinvestment="515886.08000000" sales="1806903.14000000"/>
      <mon3Flow redemption="1321046.54000000" reinvestment="0.00000000" sales="1929645.14000000"/>


    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>DFA US Social Core Equity 2 Portfolio</name>
        <lei>5493000O2UT3VQL92M59</lei>
        <title>U.S. Social Core Equity 2 Portfolio</title>
        <cusip>233203298</cusip>
        <identifiers>
          <isin value="US2332032984"/>
        </identifiers>
        <balance>1616520.86000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>54654570.38000000</valUSD>
        <pctVal>61.20447131048</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>
      <invstOrSec>
        <name>DFA Emerging Markets Social Core Equity Portfolio</name>
        <lei>549300FJQY5TSIXJD844</lei>
        <title>Emerging Markets Social Core Equity Portfolio</title>
        <cusip>233203363</cusip>
        <identifiers>
          <isin value="US2332033636"/>
        </identifiers>
        <balance>583392.93000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>11557013.90000000</valUSD>
        <pctVal>12.94202700267</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>
      <invstOrSec>
        <name>DFA International Social Core Equity Portfolio</name>
        <lei>549300T6IEPA60KWYM55</lei>
        <title>International Social Core Equity Portfolio</title>
        <cusip>25239Y626</cusip>
        <identifiers>
          <isin value="US25239Y6260"/>
        </identifiers>
        <balance>1150370.51000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>23041921.28000000</valUSD>
        <pctVal>25.80330611172</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>
      <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>
        <balance>36556.17000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>36556.17000000</valUSD>
        <pctVal>0.040937126436</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>2026-02-26</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>
