EXHIBIT 31.2

               CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

     I, Mark B. Cox, certify that:

          1.  I have reviewed this report on Form 10-Q of Giant Industries,
Inc.;

          2.  Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to
make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by
this report;

          3.  Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in this report;

          4.  The registrant's other certifying officer(s) and I are
responsible for establishing and maintaining disclosure controls and
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
registrant and have:

              (a)  Designed such disclosure controls and procedures, or
          caused such disclosure controls and procedures to be designed under
          our supervision, to ensure that material information relating to
          the registrant, including its consolidated subsidiaries, is made
          known to us by others within those entities, particularly during
          the period in which this report is being prepared;

              (b)  Evaluated the effectiveness of the registrant's
          disclosure controls and procedures and presented in this report our
          conclusions about the effectiveness of the disclosure controls and
          procedures, as of the end of the period covered by this report
          based on such evaluation; and

              (c)   Disclosed in this report any change in the registrant's
          internal control over financial reporting that occurred during the
          registrant's most recent fiscal quarter (the registrant's fourth
          fiscal quarter in the case of an annual report) that has materially
          affected, or is reasonably like to materially affect, the
          registrant's internal control over financial reporting.

          5.  The registrant's other certifying officer(s) and I have
disclosed, based on our most recent evaluation of internal control over
financial reporting, to the registrant's auditors and the audit committee of
the registrant's board of directors (or persons performing the equivalent
function):

              (a)  All significant deficiencies and material weaknesses in
          the design or operation of internal control over financial
          reporting which are reasonably likely to adversely affect the
          registrant's ability to record, process, summarize and report
          financial information; and

              (b)  Any fraud, whether or not material, that involves
          management or other employees who have a significant role in the
          registrant's internal control over financial reporting.


Date:  August 13, 2003.

By:  /s/ MARK B. COX
------------------------------
Name:  Mark B. Cox
Title: Chief Financial Officer