Exhibit 32.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

          In connection with the Quarterly Report of Sirius Satellite Radio Inc.
(the "Company") on Form 10-Q for the period ending September 30, 2003 as filed
with the Securities and Exchange Commission on the date hereof (the "Report"),
I, Joseph P. Clayton, President and Chief Executive Officer of the Company,
certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that:

          (1) 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
Company.


                                       By: /s/ JOSEPH P. CLAYTON
                                           -------------------------------------
                                           Joseph P. Clayton
                                           President and Chief Executive Officer
                                           (Principal Executive Officer)

November 6, 2003

A signed original of this written statement required by Section 906, or other
document authenticating, acknowledging, or otherwise adopting the signature that
appears in typed form within the electronic version of this written statement
required by Section 906, has been provided to the Company and will be retained
by the Company and furnished to the Securities and Exchange Commission or its
staff upon request.