Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-105986, No. 333-179933, No. 333-204120 and No. 333-266025 on Form S-8 of our reports dated February 29, 2024, relating to the financial statements of Mativ Holdings, Inc. and subsidiaries (“the Company”) and the effectiveness of the Company's internal control over financial reporting appearing in this Annual Report on Form 10-K of the Company for the year ended December 31, 2023.

/s/ Deloitte & Touche LLP

Atlanta, Georgia

February 29, 2024