Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our reports dated March 12, 2024, with respect to the consolidated financial statements and internal control over financial reporting included in the Annual Report of NN, Inc. on Form 10-K for the year ended December 31, 2023. We consent to the incorporation by reference of said reports in the Registration Statements of NN, Inc. on Forms S-8 (File Nos. 333-130395, 333-174519, 333-216739, 333-232258, and 333-265893).

/s/ GRANT THORNTON LLP

Charlotte, North Carolina

March 12, 2024