EX. -12(b)(i)

                                 CERTIFICATIONS



I, Carl G. Verboncoeur,  Principal  Executive Officer of Rydex Series Funds (the
"Trust"), certify that:

         1.     The Form N-CSR of the Trust (the  "Report")  fully complies with
                the  requirements  of Section  13(a) or 15(d) of the  Securities
                Exchange Act of 1934; and

         2.     The information  contained in the Report fairly presents, in all
                material  respects,  the  financial  condition  and  results  of
                operations of the Trust.



A signed  original of this  written  statement  required by Section 906 has been
provided  to the Trust and will be retained  by the Trust and  furnished  to the
Securities and Exchange Commission or its staff upon request.



Dated: June 7, 2005

                                                      /S/ CARL G. VERBONCOEUR
                                                      ------------------------
                                                      Carl G. Verboncoeur,
                                                      President






















                                                                  EX. -12(b)(ii)

                                 CERTIFICATIONS



I, Nick Bonos,  Vice  President & Treasurer of Rydex Series Funds (the "Trust"),
certify that:

         1.     The Form N-CSR of the Trust (the  "Report")  fully complies with
                the  requirements  of Section  13(a) or 15(d) of the  Securities
                Exchange Act of 1934; and

         2.     The information  contained in the Report fairly presents, in all
                material  respects,  the  financial  condition  and  results  of
                operations of the Trust.



A signed  original of this  written  statement  required by Section 906 has been
provided  to the Trust and will be retained  by the Trust and  furnished  to the
Securities and Exchange Commission or its staff upon request.



Dated: June 7, 2005



                                                  /S/ NICK BONOS
                                                  --------------
                                                  Nick Bonos,
                                                  Vice President & Treasurer