<?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>S000003761</seriesId>
        <classId>C000010432</classId>
        <classId>C000010433</classId>
        <classId>C000010434</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>Weakening Dollar 2x Strategy Fund</seriesName>
      <seriesId>S000003761</seriesId>
      <seriesLei>549300HVQE9YLGG0R688</seriesLei>
      <repPdEnd>2026-03-31</repPdEnd>
      <repPdDate>2025-06-30</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>1426841.71</totAssets>
      <totLiabs>6477.69</totLiabs>
      <netAssets>1420364.02</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>0.00000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000010432" rtn1="8.80489100" rtn2="0.27853200" rtn3="5.00570300"/>
          <monthlyTotReturn classId="C000010433" rtn1="8.80524000" rtn2="0.27056400" rtn3="5.01148000"/>
          <monthlyTotReturn classId="C000010434" rtn1="8.72363000" rtn2="0.21528000" rtn3="4.94389800"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <foreignExchgContracts>
            <mon1 netRealizedGain="14419.95000000" netUnrealizedAppr="146140.43000000"/>
            <mon2 netRealizedGain="26800.55000000" netUnrealizedAppr="-29446.34000000"/>
            <mon3 netRealizedGain="110573.38000000" netUnrealizedAppr="-40326.85000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="15040.36000000" netUnrealizedAppr="103098.92000000"/>
              <instrMon2 netRealizedGain="18643.58000000" netUnrealizedAppr="-15326.32000000"/>
              <instrMon3 netRealizedGain="78082.35000000" netUnrealizedAppr="-24526.60000000"/>
            </futureCategory>
            <swapCategory>
              <instrMon1 netRealizedGain="-620.41000000" netUnrealizedAppr="43041.51000000"/>
              <instrMon2 netRealizedGain="8156.97000000" netUnrealizedAppr="-14120.02000000"/>
              <instrMon3 netRealizedGain="32491.03000000" netUnrealizedAppr="-15800.25000000"/>
            </swapCategory>
          </foreignExchgContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="0.00000000" netUnrealizedAppr="279.16000000"/>
        <othMon2 netRealizedGain="0.00000000" netUnrealizedAppr="-143.20000000"/>
        <othMon3 netRealizedGain="0.00000000" netUnrealizedAppr="25.55000000"/>
      </returnInfo>
      <mon1Flow redemption="2863632.73000000" reinvestment="0.00000000" sales="4001146.42000000"/>
      <mon2Flow redemption="2218285.68000000" reinvestment="0.00000000" sales="1451884.64000000"/>
      <mon3Flow redemption="1209909.95000000" reinvestment="0.00000000" sales="938226.88000000"/>


      <varInfo>

        <fundsDesignatedInfo>
          <nameDesignatedIndex>U.S. Dollar Index</nameDesignatedIndex>
          <indexIdentifier>US0RISPROX</indexIdentifier>

        </fundsDesignatedInfo>

      </varInfo>
    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>TREASURY BILL</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>U.S. Treasury Bills</title>
        <cusip>912797PZ4</cusip>
        <identifiers>
          <isin value="US912797PZ47"/>
        </identifiers>
        <balance>47000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>46962.12000000</valUSD>
        <pctVal>3.306343961036</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2025-07-08</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>ICE Futures US Currencies</name>
        <lei>N/A</lei>
        <title>U.S. Dollar Index Futures Contracts</title>
        <cusip>N/A</cusip>
        <identifiers>
          <ticker value="DXU5"/>
        </identifiers>
        <balance>-26.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>49422.60000000</valUSD>
        <pctVal>3.479572792895</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</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>
              <indexBasketInfo>
                <indexName>DOLLAR INDEX SPOT</indexName>
                <indexIdentifier>DXY</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <expDate>2025-09-15</expDate>
            <notionalAmt>-2557382.60000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>49422.60000000</unrealizedAppr>
          </futrDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Goldman Sachs International</name>
        <lei>W22LROWP2IHZNBB6K528</lei>
        <title>U.S. Dollar Index</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="GSSWAP"/>
        </identifiers>
        <balance>-9411.82850000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>10199.07000000</valUSD>
        <pctVal>0.718060289924</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</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>
            <amtCurSold>9411.82850000</amtCurSold>
            <curSold>USD</curSold>
            <amtCurPur>0.00000000</amtCurPur>
            <curPur>USD</curPur>
            <settlementDt>2025-09-19</settlementDt>
            <unrealizedAppr>10199.07000000</unrealizedAppr>
          </swapDeriv>
        </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>305571.82000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>305571.82000000</valUSD>
        <pctVal>21.51362718973</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>4.37000000</repurchaseRt>
          <maturityDt>2025-07-01</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>718828.37000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>311683.26000000</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 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>316449.84000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>316449.84000000</valUSD>
        <pctVal>22.27948860602</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>4.39000000</repurchaseRt>
          <maturityDt>2025-07-01</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>317303.78000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>322779.20000000</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>733372.40000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>733372.40000000</valUSD>
        <pctVal>51.63270750831</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>4.37000000</repurchaseRt>
          <maturityDt>2025-07-01</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>1180073.49000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>748040.03000000</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>2025-07-30</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>
