Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-252486 and 333-217676 on Form S-8 of our report dated December 23, 2022, relating to the consolidated financial statements of Photronics, Inc., and the effectiveness of Photronics, Inc.’s internal control over financial reporting appearing in this Annual Report on Form 10-K for the year ended October 31, 2022.

/s/ Deloitte & Touche LLP

Boston, Massachusetts

December 23, 2022