EXHIBIT 32.1

                          CAPSTEAD MORTGAGE CORPORATION
                           CERTIFICATIONS 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 Capstead Mortgage Corporation (the
"Issuer") on Form 10-Q for the period ended September 30, 2003, as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Andrew F. Jacobs, President and Chief Executive Officer of the Issuer, 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 Issuer.



Date: November 5, 2003        By:  /s/ ANDREW F. JACOBS
                                   --------------------------------------------
                                   Andrew F. Jacobs
                                   President and Chief Executive Officer



In connection with the Quarterly Report of Capstead Mortgage Corporation (the
"Issuer") on Form 10-Q for the period ended September 30, 2003, as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Phillip A. Reinsch, Senior Vice President and Chief Financial Officer of the
Issuer, 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 Issuer.



Date: November 5, 2003        By:  /s/ PHILLIP A. REINSCH
                                   -------------------------------------------
                                   Phillip A. Reinsch
                                   Senior Vice President and
                                   Chief Financial Officer