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 March 1, 2018, with respect to the consolidated balance sheets of CVB Financial Corp. as of December 31, 2017 and 2016, and the related consolidated statements of earnings and comprehensive income, stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2017, and the related notes (collectively, the “consolidated financial statements”), and the effectiveness of internal control over financial reporting as of December 31, 2017, incorporated herein by reference and to the reference to our firm under the heading “Experts” in the prospectus.

/s/ KPMG LLP

Los Angeles, California

April 16, 2018