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 Jabil Circuit, Inc. (the "Company")
on Form 10-Q for the fiscal quarter ended February 29, 2004 as filed with the
Securities and Exchange Commission on the date hereof (the "Form 10-Q"), I,
Timothy L. Main, President and Chief Executive Officer of the Company, hereby
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 Form 10-Q fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and


(2)      The information contained in the Form 10-Q fairly presents, in all
material respects, the financial condition and results of operations of the
Company.


Date: April 13, 2004


                                                /s/ TIMOTHY L. MAIN
                                       ----------------------------------------
                                                   Timothy L. Main
                                         President and Chief Executive Officer