EXHIBIT 99.1

                  CERTIFICATION PURSUANT TO SECTION 906
                    OF THE SARBANES-OXLEY ACT OF 2002


I, Fred L. Holliger, Chief Executive Officer of Giant Industries, Inc.
("Giant"), do hereby certify that: (a) the Quarterly Report on Form
10-Q of Giant for the quarterly period ended March 31, 2003 (the "Form
10-Q") to which this certification is being furnished as an exhibit
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 Form 10-Q fairly presents, in all material respects, the financial
condition and results of operations of Giant.

Giant Industries, Inc.


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

Date:   May  14,  2003.