EXHIBIT 23.1
Consent of Independent Registered Public Accounting Firm
The Board of Directors
CVB Financial Corp.
We consent to the use of our reports dated February 27, 2009, with respect to the consolidated
balance sheets of CVB Financial Corp. as of December 31, 2008 and 2007, and the related
consolidated statements of earnings, stockholders’ equity and comprehensive income, and cash flows
for each of the years in the two-year period ended December 31, 2008, and the effectiveness of
internal control over financial reporting as of December 31, 2008 incorporated herein by reference
and to the reference to our firm under the heading “Experts” in the prospectus.
Los Angeles, California
June 2, 2009