Exhibit 5.1

February 27, 2025

BiomX Inc.

22 Einstein St., Floor 4

Ness Ziona, Israel

Ladies and Gentlemen:

We have acted as counsel to BiomX Inc., a Delaware corporation (the “Company”), in connection with the preparation and filing with the Securities and Exchange Commission (the “Commission”) on the date hereof, pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the “Act”) of the Company’s prospectus supplement, dated February 25, 2025 (the “Prospectus Supplement”), forming part of the registration statement on Form S-3, Registration No. 333-275935, initially filed by the Company with the Commission on December 7, 2023, and declared effective on January 2, 2024 (the “Registration Statement”). The Prospectus Supplement relates to the proposed sale of (i) 2,828,283 shares (the “Shares”) of the Company’s common stock, par value $0.0001 per share (the “Common Stock”) and (ii) registered pre-funded warrants (the “Pre-Funded Warrants”) to purchase up to an aggregate of 805,231 shares of Common Stock (the “Pre-Funded Warrant Shares”) pursuant to that certain Securities Purchase Agreement, dated February 25, 2025, by and between the Company and the investors named therein (the “Securities Purchase Agreement”).

In rendering the opinion set forth herein, we have examined the originals, or photostatic or certified copies, of (i) the Amended and Restated Certificate of Incorporation and Amended and Restated Bylaws of the Company, each as amended and/or restated as of the date hereof, (ii) certain resolutions of the Board of Directors of the Company (the “Board”) related to the filing of the Registration Statement and the Prospectus Supplement, the authorization and issuance of the Shares, the Pre-Funded Warrants and the Pre-Funded Warrant Shares and related matters, (iii) the Registration Statement and all exhibits thereto, (iv) the Prospectus Supplement and the base prospectus, dated January 2, 2024, included in the Registration Statement (the “Base Prospectus” and together with the Prospectus Supplement, the “Prospectus”), (v) the Securities Purchase Agreement, (vi) the specimen Common Stock certificate, (vii) a certificate executed by an officer of the Company, dated as of the date hereof, and (viii) such other records, documents and instruments as we deemed relevant and necessary for purposes of the opinion stated herein.

We have relied upon such certificates of officers of the Company and of public officials and statements and information furnished by officers of the Company with respect to the accuracy of material factual matters contained therein which were not independently established by us. In such examination we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as photostatic or certified copies, and the authenticity of the originals of such copies.

In making the foregoing examination we have assumed the genuineness of all signatures, the legal capacity of all natural persons, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as photostatic or certified copies, and the authenticity of the originals of such copies. As to all questions of fact material to this opinion, where such facts have not been independently established, we have relied, to the extent we have deemed reasonably appropriate, upon representations or certificates of officers of the Company or governmental officials.

BiomX Inc.

February 27, 2025

Page 2

We have not considered, and express no opinion herein as to, the laws of any state or jurisdiction other than the laws of the State of Delaware, as currently in effect (all of the foregoing being referred to as the “Opined on Law”). We do not express any opinion with respect to any other laws, or the laws of any other jurisdiction (including, without limitation, any laws of any other jurisdiction which might be referenced by the choice-of-law rules of the Opined Law), other than the Opined on Law or as to the effect of any such other laws on the opinions herein stated.

Based upon the foregoing, and subject to the qualifications, assumptions and limitations stated herein, we are of the opinion that:

We hereby consent to the filing of this opinion as an Exhibit 5.1 to the Company’s Current Report on Form 8-K to be filed with the Commission. We further consent to the reference to our firm under the caption “Legal Matters” in the Prospectus constituting a part of the Registration Statement. In giving this consent, we are not admitting that we are within the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder.