ONEOK (OKE) S-8 Registration of securities for employees

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement onForm S-8 of ONEOK, Inc. of our report dated February 25, 2020 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in ONEOK, Inc.’s Annual Report onForm 10-K for the year ended December 31, 2019.

/s/ PricewaterhouseCoopers LLP

Tulsa, Oklahoma

April 28, 2020