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 Annual Report of Giant Industries, Inc.
("Giant") on Form 10-K for the year ending December 31, 2006, as filed
with the Securities and Exchange Commission on the date hereof (the
"Report"), I, Fred L. Holliger, Chief Executive Officer of Giant,
certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that:

     (a) The Report fully complies with the requirements of Section
13(a) or 15(d) of the Securities Exchange Act of 1934; and

     (b) The information contained in the Report fairly presents, in
all material respects, the financial condition and results of
operations of Giant.

                             By: /s/ FRED L. HOLLIGER
                                ------------------------------
                                Name:  Fred L. Holliger
                                Title: Chief Executive Officer

Date: March 1, 2007