Exhibit 23 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in Registration Statement Nos. 333-88519, 333-41318, 333-50442 and 333-41198 of CVB Financial Corp. on Form S-8, of our report, dated March 10, 2004, appearing in this Annual Report on Form 10-K of CVB Financial Corp. for the year ended December 31, 2003. /s/ DELOITTE & TOUCHE LLP Los Angeles, California March 11, 2004