Cimarex Energy (CIMXP) 10-K 2016 FY Annual report

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Cimarex Energy Co.:

We consent to the incorporation by reference in the registration statement (No. 333-207063) on Form S-3 and registration statements (Nos. 333-196169, 333-125621, 333-174361, and 333-100235) on Form S-8 of Cimarex Energy Co. of our reports dated February 24, 2017, with respect to the consolidated balance sheets of Cimarex Energy Co. and subsidiaries as of December 31, 2016 and 2015, and the related consolidated statements of operations and comprehensive income (loss), stockholders' equity, and cash flows 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 Cimarex Energy Co.

/s/ KPMG LLP

Denver, Colorado

February 24, 2017