<?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>S000015882</seriesId>
        <classId>C000043618</classId>
        <classId>C000043619</classId>
        <classId>C000043620</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 High Yield Strategy Fund</seriesName>
      <seriesId>S000015882</seriesId>
      <seriesLei>SCQPAL0SXRZDT2DWGE91</seriesLei>
      <repPdEnd>2025-03-31</repPdEnd>
      <repPdDate>2024-12-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>3851532.43</totAssets>
      <totLiabs>7197.38</totLiabs>
      <netAssets>3844335.05</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>466432.94000000</cshNotRptdInCorD>
      <curMetrics>
        <curMetric>
          <curCd>USD</curCd>
          <intrstRtRiskdv01 period10Yr="3.21298225" period1Yr="-275.22168584" period30Yr="0.21279610" period3Mon="-2.14938542" period5Yr="-1266.24179263"/>
          <intrstRtRiskdv100 period10Yr="321.29822511" period1Yr="-27522.16858406" period30Yr="21.27960983" period3Mon="-214.93854206" period5Yr="-126624.17926317"/>
        </curMetric>
      </curMetrics>
      <creditSprdRiskInvstGrade period10Yr="0.00000000" period1Yr="45.57826332" period30Yr="0.00000000" period3Mon="0.00000000" period5Yr="3.64852226"/>
      <creditSprdRiskNonInvstGrade period10Yr="0.00000000" period1Yr="-44.28864000" period30Yr="0.00000000" period3Mon="-106.69536000" period5Yr="0.00000000"/>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000043618" rtn1="2.98618200" rtn2="-1.89201800" rtn3="1.99136000"/>
          <monthlyTotReturn classId="C000043619" rtn1="2.93403300" rtn2="-1.95534900" rtn3="1.89808200"/>
          <monthlyTotReturn classId="C000043620" rtn1="2.97164400" rtn2="-1.82355000" rtn3="1.97985000"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <creditContracts>
            <mon1 netRealizedGain="179.48000000" netUnrealizedAppr="19856.96000000"/>
            <mon2 netRealizedGain="-87525.10000000" netUnrealizedAppr="-19823.26000000"/>
            <mon3 netRealizedGain="0.00000000" netUnrealizedAppr="31818.25000000"/>
            <swapCategory>
              <instrMon1 netRealizedGain="179.48000000" netUnrealizedAppr="19856.96000000"/>
              <instrMon2 netRealizedGain="-87525.10000000" netUnrealizedAppr="-19823.26000000"/>
              <instrMon3 netRealizedGain="0.00000000" netUnrealizedAppr="31818.25000000"/>
            </swapCategory>
          </creditContracts>
          <equityContracts>
            <mon1 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            <mon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            <mon3 netRealizedGain="-0.33000000" netUnrealizedAppr="0.00000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
              <instrMon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
              <instrMon3 netRealizedGain="-0.33000000" netUnrealizedAppr="0.00000000"/>
            </futureCategory>
          </equityContracts>
          <interestRtContracts>
            <mon1 netRealizedGain="0.00000000" netUnrealizedAppr="143143.37000000"/>
            <mon2 netRealizedGain="166624.13000000" netUnrealizedAppr="-138051.70000000"/>
            <mon3 netRealizedGain="0.00000000" netUnrealizedAppr="51761.80000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="0.00000000" netUnrealizedAppr="143143.37000000"/>
              <instrMon2 netRealizedGain="166624.13000000" netUnrealizedAppr="-138051.70000000"/>
              <instrMon3 netRealizedGain="0.00000000" netUnrealizedAppr="51761.80000000"/>
            </futureCategory>
          </interestRtContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="0.00000000" netUnrealizedAppr="-1053.81000000"/>
        <othMon2 netRealizedGain="3072.14000000" netUnrealizedAppr="-2150.66000000"/>
        <othMon3 netRealizedGain="0.00000000" netUnrealizedAppr="507.73000000"/>
      </returnInfo>
      <mon1Flow redemption="110714.61000000" reinvestment="0.00000000" sales="122731.86000000"/>
      <mon2Flow redemption="11144781.43000000" reinvestment="0.00000000" sales="6163694.73000000"/>
      <mon3Flow redemption="28766.69000000" reinvestment="0.00000000" sales="3116173.32000000"/>


      <varInfo>

        <fundsDesignatedInfo>
          <nameDesignatedIndex>Bloomberg Barclays U.S. Corporate High Yield Index</nameDesignatedIndex>
          <indexIdentifier>LEH_HY</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>9164.49700000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>227829.40000000</valUSD>
        <pctVal>5.926366901865</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>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>1769748.06000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1769748.06000000</valUSD>
        <pctVal>46.03521901661</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>4.45000000</repurchaseRt>
          <maturityDt>2025-01-02</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>2004381.69000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>1805143.75000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <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>22678.06800000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>227007.46000000</valUSD>
        <pctVal>5.904986351280</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>Barclays Bank plc</name>
        <lei>G5GSEF7VJP5I7OUK5573</lei>
        <title>CDX.NA.HY.43.V1</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="CDXHY43609070"/>
        </identifiers>
        <balance>3600000.00000000</balance>
        <units>OU</units>
        <descOthUnits>Notional Amount</descOthUnits>
        <curCd>USD</curCd>
        <valUSD>-277504.20000000</valUSD>
        <pctVal>-7.21852274556</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DCR</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>
            <counterparties>
              <counterpartyName>Intercontinental Exchange</counterpartyName>
              <counterpartyLei>5493000F4ZO33MV32P92</counterpartyLei>
            </counterparties>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>CDX HY43 V1 5% 12/20/2029</indexName>
                <indexIdentifier>N/A</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <swapFlag>Y</swapFlag>
            <otherRecDesc fixedOrFloating="Other">CDX HY43 V1 5% 12/20/2029 - Tenor Quarterly</otherRecDesc>
            <fixedPmntDesc amount="0.00000000" curCd="USD" fixedOrFloating="Fixed" fixedRt="5.00000000"/>
            <terminationDt>2029-12-20</terminationDt>
            <upfrontPmnt>0.00000000</upfrontPmnt>
            <pmntCurCd>USD</pmntCurCd>
            <upfrontRcpt>306552.65000000</upfrontRcpt>
            <rcptCurCd>USD</rcptCurCd>
            <notionalAmt>3600000.00000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>29048.45000000</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>912797LY1</cusip>
        <identifiers>
          <isin value="US912797LY18"/>
        </identifiers>
        <balance>47000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>46922.65000000</valUSD>
        <pctVal>1.220566089836</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2025-01-16</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>Chicago Board of Trade</name>
        <lei>N/A</lei>
        <title>U.S. Treasury 5 Year Note Futures Contracts</title>
        <cusip>N/A</cusip>
        <identifiers>
          <ticker value="FVH5"/>
        </identifiers>
        <balance>-37.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>45734.34000000</valUSD>
        <pctVal>1.189655412579</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DIR</assetCat>
        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <futrDeriv derivCat="FUT">
            <counterparties>
              <counterpartyName>Goldman Sachs &amp; Co. LLC</counterpartyName>
              <counterpartyLei>FOR8UP27PHTHYVLBNG30</counterpartyLei>
            </counterparties>
            <payOffProf>Short</payOffProf>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>N/A</issuerName>
                <issueTitle>US 5yr 6%</issueTitle>
                <identifiers>
                  <cusip value="N/A"/>
                  <other otherDesc="Interest Rate Future" value="US 5yr 6%"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <expDate>2025-03-31</expDate>
            <notionalAmt>-3979007.78000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>45734.34000000</unrealizedAppr>
          </futrDeriv>
        </derivativeInfo>
        <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>1391093.71000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1391093.71000000</valUSD>
        <pctVal>36.18554813530</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>4.43000000</repurchaseRt>
          <maturityDt>2025-01-02</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>1531304.90000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>1418915.85000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2025-01-30</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>
  <documents>XXXX</documents>
</edgarSubmission>
