<?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>0000899148</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000003771</seriesId>
        <classId>C000010455</classId>
        <classId>C000010456</classId>
        <classId>C000010454</classId>
      </seriesClassInfo>

    </filerInfo>
  </headerData>
  <formData>
    <genInfo>
      <regName>Rydex Series Funds</regName>
      <regFileNumber>811-07584</regFileNumber>
      <regCik>0000899148</regCik>
      <regLei>5493004D62WV1EDNTU07</regLei>
      <regStreet1>702 King Farm Blvd., Suite 200</regStreet1>
      <regCity>Rockville</regCity>
      <regStateConditional regCountry="US" regState="US-MD"/>
      <regZipOrPostalCode>20850</regZipOrPostalCode>
      <regPhone>301-296-5100</regPhone>
      <seriesName>Inverse Mid-Cap Strategy Fund</seriesName>
      <seriesId>S000003771</seriesId>
      <seriesLei>54930037B8QM4B0GQX38</seriesLei>
      <repPdEnd>2024-03-31</repPdEnd>
      <repPdDate>2023-09-30</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>787797.89</totAssets>
      <totLiabs>5711.49</totLiabs>
      <netAssets>782086.40</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>0.02000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000010455" rtn1="-3.39223700" rtn2="3.63776600" rtn3="6.18595800"/>
          <monthlyTotReturn classId="C000010456" rtn1="-3.30651700" rtn2="3.79280300" rtn3="6.35010000"/>
          <monthlyTotReturn classId="C000010454" rtn1="-3.40711400" rtn2="3.65292800" rtn3="6.19784800"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <equityContracts>
            <mon1 netRealizedGain="-38264.57000000" netUnrealizedAppr="-107097.74000000"/>
            <mon2 netRealizedGain="-10682.25000000" netUnrealizedAppr="111970.22000000"/>
            <mon3 netRealizedGain="59218.17000000" netUnrealizedAppr="112042.32000000"/>
            <swapCategory>
              <instrMon1 netRealizedGain="-38264.57000000" netUnrealizedAppr="-107097.74000000"/>
              <instrMon2 netRealizedGain="-10682.25000000" netUnrealizedAppr="111970.22000000"/>
              <instrMon3 netRealizedGain="59218.17000000" netUnrealizedAppr="112042.32000000"/>
            </swapCategory>
          </equityContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="0.00000000" netUnrealizedAppr="214.82000000"/>
        <othMon2 netRealizedGain="0.00000000" netUnrealizedAppr="108.59000000"/>
        <othMon3 netRealizedGain="0.00000000" netUnrealizedAppr="-145.69000000"/>
      </returnInfo>
      <mon1Flow redemption="568949.04000000" reinvestment="0.00000000" sales="374296.66000000"/>
      <mon2Flow redemption="115372.31000000" reinvestment="0.00000000" sales="335773.41000000"/>
      <mon3Flow redemption="3325964.85000000" reinvestment="0.00000000" sales="231210.20000000"/>


      <varInfo>

        <fundsDesignatedInfo>
          <nameDesignatedIndex>S&amp;P MidCap 400 Index</nameDesignatedIndex>
          <indexIdentifier>SNP400</indexIdentifier>

        </fundsDesignatedInfo>

      </varInfo>
    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>Guggenheim Partners Investment Management LLC</name>
        <lei>N/A</lei>
        <title>Guggenheim Strategy Fund II</title>
        <cusip>N/A</cusip>
        <identifiers>
          <ticker value="GFSBX"/>
        </identifiers>
        <balance>2019.98700000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>49025.08000000</valUSD>
        <pctVal>6.268499234867</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>Guggenheim Partners Investment Management LLC</name>
        <lei>N/A</lei>
        <title>Guggenheim Ultra Short Duration Fund - Institutional Class</title>
        <cusip>40169J523</cusip>
        <identifiers>
          <isin value="US40169J5231"/>
        </identifiers>
        <balance>4630.08700000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>45143.35000000</valUSD>
        <pctVal>5.772169161872</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>Goldman Sachs International</name>
        <lei>W22LROWP2IHZNBB6K528</lei>
        <title>S&amp;P MidCap 400 Index</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="GSSWAP"/>
        </identifiers>
        <balance>-131.77990000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>5679.75000000</valUSD>
        <pctVal>0.726230503432</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <swapDeriv derivCat="SWP">
            <counterparties>
              <counterpartyName>Goldman Sachs International</counterpartyName>
              <counterpartyLei>W22LROWP2IHZNBB6K528</counterpartyLei>
            </counterparties>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>S&amp;P Midcap 400 Index</indexName>
                <indexIdentifier>N/A</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <swapFlag>Y</swapFlag>
            <floatingRecDesc curCd="USD" fixedOrFloating="Floating" floatingRtIndex="FEDL01 Index" floatingRtSpread="-0.05000000" pmntAmt="0.00000000">
              <rtResetTenors>
                <rtResetTenor rateTenor="Month" rateTenorUnit="3" resetDt="Day" resetDtUnit="1"/>
              </rtResetTenors>
            </floatingRecDesc>
            <otherPmntDesc fixedOrFloating="Other">S&amp;P MidCap 400 Index-Tenor Quarterly</otherPmntDesc>
            <terminationDt>2023-12-21</terminationDt>
            <upfrontPmnt>0.00000000</upfrontPmnt>
            <pmntCurCd>USD</pmntCurCd>
            <upfrontRcpt>0.00000000</upfrontRcpt>
            <rcptCurCd>USD</rcptCurCd>
            <notionalAmt>-329729.12000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>5679.75000000</unrealizedAppr>
          </swapDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>TREASURY BILL</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>U.S. Treasury Bills</title>
        <cusip>912797HJ9</cusip>
        <identifiers>
          <isin value="US912797HJ96"/>
        </identifiers>
        <balance>200000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>198944.75000000</valUSD>
        <pctVal>25.43769460765</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2023-11-07</maturityDt>
          <couponKind>None</couponKind>
          <annualizedRt>0.00000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>BOFA SECURITIES, INC.</name>
        <lei>549300HN4UKV1E2R3U73</lei>
        <title>BofA Securities, Inc.</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="REPO-BANK"/>
        </identifiers>
        <balance>95544.95000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>95544.95000000</valUSD>
        <pctVal>12.21667452598</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>RA</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <notClearedCentCparty isCleared="N">
            <counterpartyInfos>
              <counterpartyInfo lei="549300HN4UKV1E2R3U73" name="BOFA SECURITIES, INC."/>
            </counterpartyInfos>
          </notClearedCentCparty>
          <isTriParty>Y</isTriParty>
          <repurchaseRt>5.30000000</repurchaseRt>
          <maturityDt>2023-10-02</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>97935.26000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>97455.91000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Barclays Bank plc</name>
        <lei>G5GSEF7VJP5I7OUK5573</lei>
        <title>S&amp;P MidCap 400 Index</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="BRSWAP"/>
        </identifiers>
        <balance>-130.99390000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>6872.30000000</valUSD>
        <pctVal>0.878713656189</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <swapDeriv derivCat="SWP">
            <counterparties>
              <counterpartyName>BARCLAYS BANK PLC</counterpartyName>
              <counterpartyLei>G5GSEF7VJP5I7OUK5573</counterpartyLei>
            </counterparties>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>S&amp;P Midcap 400 Index</indexName>
                <indexIdentifier>N/A</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <swapFlag>Y</swapFlag>
            <floatingRecDesc curCd="USD" fixedOrFloating="Floating" floatingRtIndex="SOFR Index" floatingRtSpread="0.20000000" pmntAmt="0.00000000">
              <rtResetTenors>
                <rtResetTenor rateTenor="Month" rateTenorUnit="3" resetDt="Day" resetDtUnit="1"/>
              </rtResetTenors>
            </floatingRecDesc>
            <otherPmntDesc fixedOrFloating="Other">S&amp;P MidCap 400 Index-Tenor Quarterly</otherPmntDesc>
            <terminationDt>2023-12-20</terminationDt>
            <upfrontPmnt>0.00000000</upfrontPmnt>
            <pmntCurCd>USD</pmntCurCd>
            <upfrontRcpt>0.00000000</upfrontRcpt>
            <rcptCurCd>USD</rcptCurCd>
            <notionalAmt>-327762.46000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>6872.30000000</unrealizedAppr>
          </swapDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>BARCLAYS CAPITAL INC.</name>
        <lei>AC28XWWI3WIBK2824319</lei>
        <title>Barclays Capital, Inc.</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="REPO-BARC"/>
        </identifiers>
        <balance>96497.96000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>96497.96000000</valUSD>
        <pctVal>12.33852934918</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>RA</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <notClearedCentCparty isCleared="N">
            <counterpartyInfos>
              <counterpartyInfo lei="AC28XWWI3WIBK2824319" name="BARCLAYS CAPITAL INC."/>
            </counterpartyInfos>
          </notClearedCentCparty>
          <isTriParty>Y</isTriParty>
          <repurchaseRt>5.29000000</repurchaseRt>
          <maturityDt>2023-10-02</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>106634.05000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>98428.04000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>J.P. MORGAN SECURITIES LLC</name>
        <lei>ZBUT11V806EZRVTWT807</lei>
        <title>J.P. Morgan Securities LLC</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="REPO-JP M"/>
        </identifiers>
        <balance>248416.86000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>248416.86000000</valUSD>
        <pctVal>31.76335248893</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>RA</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <notClearedCentCparty isCleared="N">
            <counterpartyInfos>
              <counterpartyInfo lei="ZBUT11V806EZRVTWT807" name="J.P. MORGAN SECURITIES LLC"/>
            </counterpartyInfos>
          </notClearedCentCparty>
          <isTriParty>Y</isTriParty>
          <repurchaseRt>5.30000000</repurchaseRt>
          <maturityDt>2023-10-02</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>256895.14000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>253385.21000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>BNP Paribas</name>
        <lei>R0MUWSFPU8MPRO8K5P83</lei>
        <title>S&amp;P MidCap 400 Index</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="BNPSWAP"/>
        </identifiers>
        <balance>-47.17380000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>2034.41000000</valUSD>
        <pctVal>0.260125991194</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <swapDeriv derivCat="SWP">
            <counterparties>
              <counterpartyName>BNP Paribas</counterpartyName>
              <counterpartyLei>R0MUWSFPU8MPRO8K5P83</counterpartyLei>
            </counterparties>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>S&amp;P Midcap 400 Index</indexName>
                <indexIdentifier>N/A</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <swapFlag>Y</swapFlag>
            <floatingRecDesc curCd="USD" fixedOrFloating="Floating" floatingRtIndex="FEDL01 Index" floatingRtSpread="0.05000000" pmntAmt="0.00000000">
              <rtResetTenors>
                <rtResetTenor rateTenor="Month" rateTenorUnit="3" resetDt="Day" resetDtUnit="1"/>
              </rtResetTenors>
            </floatingRecDesc>
            <otherPmntDesc fixedOrFloating="Other">S&amp;P MidCap 400 Index-Tenor Quarterly</otherPmntDesc>
            <terminationDt>2023-12-21</terminationDt>
            <upfrontPmnt>0.00000000</upfrontPmnt>
            <pmntCurCd>USD</pmntCurCd>
            <upfrontRcpt>0.00000000</upfrontRcpt>
            <rcptCurCd>USD</rcptCurCd>
            <notionalAmt>-118034.51000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>2034.41000000</unrealizedAppr>
          </swapDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2023-10-30</ncom:dateSigned>
      <ncom:nameOfApplicant>Rydex Series Funds</ncom:nameOfApplicant>
      <ncom:signature>James Howley</ncom:signature>
      <ncom:signerName>James Howley</ncom:signerName>
      <ncom:title>CFO</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
