Exhibit

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 22, 2018, with respect to the consolidated balance sheets of Commerce Bancshares, Inc. and subsidiaries as of December 31, 2017 and 2016, 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, 2017, and the effectiveness of internal control over financial reporting as of December 31, 2017, which reports appear in the December 31, 2017 annual report on Form 10-K of Commerce Bancshares, Inc.