Exhibit 23
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in the Registration Statement of ONE Gas, Inc., on Form S-8 (File Nos. 333-193690 and 333-205099) of our report dated June 10, 2020, on our audits of the financial statements and supplemental schedule of the ONE Gas, Inc. 401(k) Plan, as of December 31, 2019 and 2018, and for the year ended December 31, 2019, which report is included in this Annual Report on Form 11-K.
/s/ BKD, LLP
Tulsa, Oklahoma
June 10, 2020