EXHIBIT 31.1

I, Peter S. Kirlin, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q/A of Photronics, Inc.

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

/s/ PETER S. KIRLIN

Peter S. Kirlin

Chief Executive Officer

December 19, 2017