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Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-193690 and 333-205099) of our report dated June 25, 2026, with respect to the financial statements and supplemental schedule of ONE Gas, Inc. 401(k) Plan included in this Annual Report on Form 11-K for the year ended December 31, 2025.

/s/ Forvis Mazars, LLP

Tulsa, Oklahoma

June 25, 2026