Commerce Bancshares (CBSH) 10-K 2016 FY Annual report

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors

Commerce Bancshares, Inc.:

We consent to the incorporation by reference in the Registration Statements No. 33-28294, No. 33-82692, No. 33-8075, No. 33-78344, No. 333-14651, No. 333-186867, No. 333-188374, and No. 333-214495, each on Form S-8, and No. 333-140221 and No. 333-196689, each on Form S-3ASR of Commerce Bancshares, Inc. of our reports dated February 23, 2017, with respect to the consolidated balance sheets of Commerce Bancshares, Inc. and subsidiaries as of December 31, 2016 and 2015, and the related consolidated statements of income, comprehensive income, cash flows, and changes in equity for each of the years in the three-year period ended December 31, 2016, and the effectiveness of internal control over financial reporting as of December 31, 2016, which reports appear in the December 31, 2016 annual report on Form 10-K of Commerce Bancshares, Inc.

KPMG LLP

Kansas City, Missouri

February 23, 2017