Exhibit 5.1

DAVIDOFF HUTCHER & CITRON LLP

605 Third Avenue

New York, New York 10158

(212) 557-7200

Atlantic International Corp.

270 Sylvan Avenue, Suite 2230

Englewood Cliffs, NJ 07632

March 20, 2026

Ladies and Gentlemen:

We have acted as counsel for Atlantic International Corp., a Delaware corporation (the “Company”), in connection with the Registration Statement on Form S-3 (such registration statement as amended and supplemented, the “Registration Statement,” and the prospectus contained therein, the “Prospectus”), being filed by the Company on the date of this opinion letter with the Securities and Exchange Commission (the “SEC”) in connection with the registration under the Securities Act of 1933, as amended (the “Securities Act”), of 12,516,070 shares of the Company’s Common Stock, par value $0.00001 per share (the “Common Stock”) to be offered and sold by a certain stockholder of the Company named in the Prospectus. This opinion letter is being furnished in accordance with the requirements of Item 16 of Form S-3 and Item 601(b)(5)(i) of Regulation S-K promulgated under the Securities Act. Capitalized terms used and not defined herein shall have the meanings assigned to them in the Registration Statement.

In connection with this opinion, we have assumed that the Registration Statement, and any amendments thereto will have become effective, and the Common Stock will be sold in the manner described in the Registration Statement and the Prospectus relating thereto.

In connection with the opinions expressed herein, we have examined originals or copies, certified or otherwise identified to our satisfaction, of such documents, corporate records, certificates of public officials and other instruments as we have deemed necessary for the purposes of rendering this opinion. In our examination, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity with the originals of all documents submitted to us as copies, the authenticity of the originals of such documents and the legal competence of all signatories to such documents. We have also reviewed such questions of law as we have deemed necessary or appropriate.

As to matters of fact relevant to the opinion expressed herein, and as to factual matters arising in connection with our examination of corporate documents, records and other documents and writings, we relied upon certificates and other communications of corporate officers of the Company, without further investigation as to the facts set forth therein.

Based upon the foregoing, and subject to the qualifications, assumptions and limitations stated herein, we are of the opinion that the shares of Common Stock being sold pursuant to the Registration Statement are duly authorized and will be, when sold in the manner described in the Registration Statement, legally and validly issued, and fully paid and non-assessable.

The foregoing opinion is limited in all respect to the facts as they currently exist and the General Corporation Law of the State of Delaware (including the applicable provisions of the Delaware Constitution and the reported judicial decisions interpreting these laws) and the federal laws of the United States of America, and we do not express any opinions as to the laws of any other jurisdiction. We assume no obligations to revise or supplement this opinion in the event of future changes in such laws or the interpretation thereof or such facts.

We hereby consent to the statements with respect to us under the heading “Legal Matters” in the Prospectus and to the filing of this opinion as Exhibit 5.1 to the Registration Statement. In giving these consents, we do not thereby admit that we are within the category of persons whose consent is required under Section 7 of the Securities Act or the Rules and Regulations of the Commission.

EHL/ela