Exhibit 99.1

CERTIFICATION

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 CVB Financial  Corp.  (the "Company") on Form 10-Q for the period
ended March 31, 2003, as filed with the Securities and Exchange  Commission on the date hereof (the  "Report"),  I,
D. Linn Wiley, Chief Executive Officer of the Company,  certify,  pursuant to 18 U.S.C.ss.1350, as adopted pursuant
to ss.906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge 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 result of operations of the Company.


Date:    May 14, 2003                                                   /s/  D. Linn  Wiley
                                                                       --------------------

                                                                       D. Linn Wiley
                                                                       Chief Executive Officer




As signed original of this written  statement  required by Section 906 has been provided to CVB Financial Corp. and
will be retained by CVB Financial  Corp.  and furnished to the Securities  and Exchange  Commissioner  on its staff
upon request.