EXHIBIT 23.1

DEGOLYER AND MACNAUGHTON

5001 Spring Valley Road

Suite 800 East

Dallas, Texas 75244

February 14, 2020

EOG Resources, Inc.

1111 Bagby, Sky Lobby 2

Houston, Texas 77002

Ladies and Gentlemen:

We hereby consent to the inclusion of references to our firm and to the opinions as mentioned below delivered to EOG Resources, Inc. (EOG) regarding our comparison of estimates prepared by us with those provided to us by EOG of the proved oil, condensate, natural gas liquids, and gas reserves of certain selected properties in which EOG has represented it holds an interest in the section entitled “Supplemental Information to Consolidated Financial Statements - Oil and Gas Producing Activities” in EOG’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019, to be filed with the United States Securities and Exchange Commission on or about February 27, 2020. The opinions are contained in our reports of third party dated January 30, 2018, January 25, 2019, and January 24, 2020, with respect to the reserves estimates as of December 31, 2017, December 31, 2018, and December 31, 2019, respectively. Additionally, we hereby consent to the incorporation by reference of such references to our firm and to our opinions in EOG’s previously filed Registration Statement (File Nos. 333-62256, 333-84014, 333-150791, 333-166517, 333-166518, 333-179884, 333-188352, 333-214894, 333‑224466, and 333-228827).

Very truly yours,

/s/ DeGOLYER and MacNAUGHTON

DeGOLYER and MacNAUGHTON

Texas Registered Engineering Firm F-716