Exhibit 23.1

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM’S CONSENT

We consent to the incorporation by reference in the Registration Statement of Applied DNA Sciences, Inc. on Form S-1 (File Nos. 333-233830, 333-234664, 333-266223 and 333-266512), Form S-3 (File Nos. 333-252280, 333-202432, 333-220481, 333-218158, 333-214920, 333-238557, 333-266217 and 333-272267) and Form S-8 (File Nos. 333-182350, 333-205123, 333-231944 and 333-249365) of our report dated December 7, 2023, which includes an explanatory paragraph as to the Company’s ability to continue as a going concern, with respect to our audits of the consolidated financial statements of Applied DNA Sciences, Inc. and Subsidiaries  as of September 30, 2023 and 2022 and for each of the two years in the period  ended September 30, 2023, which report is included in this Annual Report on Form 10-K of Applied DNA Sciences, Inc. for the year ended September 30, 2023.

/s/ Marcum LLP

Marcum LLP

Melville, NY

December 7, 2023