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Exhibit 5.1


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Davis Polk & Wardwell llp
450 Lexington Avenue
New York, NY 10017
davispolk.com

October 20, 2025
Galaxy Digital Inc.
300 Vesey Street
New York, NY 10007
Ladies and Gentlemen:
Galaxy Digital Inc., a Delaware corporation (the “Company”), has filed with the Securities and Exchange Commission a Registration Statement on Form S-1 (the “Registration Statement”) and the related prospectus (the “Prospectus”) under the Securities Act of 1933, as amended (the “Securities Act”). The Registration Statement relates to the registration for resale by the selling stockholders therein of up to an aggregate of 12,777,778 shares (the “Resale Shares”) of the Company’s Class A common stock, par value $0.001 per share, which may be sold from time to time by such Stockholders.
We, as your counsel, have examined originals or copies of such documents, corporate records, certificates of public officials and other instruments as we have deemed necessary or advisable for the purpose of rendering this opinion.
In rendering the opinion expressed herein, we have, without independent inquiry or investigation, assumed that (i) all documents submitted to us as originals are authentic and complete, (ii) all documents submitted to us as copies conform to authentic, complete originals, (iii) all documents filed as exhibits to the Registration Statement that have not been executed will conform to the forms thereof, (iv) all signatures on all documents that we reviewed are genuine, (v) all natural persons executing documents had and have the legal capacity to do so, (vi) all statements in certificates of public officials and officers of the Company that we reviewed were and are accurate and (vii) all representations made by the Company as to matters of fact in the documents that we reviewed were and are accurate.
Based upon the foregoing, we are of the opinion that the Resale Shares have been validly issued and are fully paid and non-assessable.
We are members of the Bar of the State of New York and the foregoing opinion is limited to the General Corporation Law of the State of Delaware.
We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and further consent to the reference to our name under the caption “Legal Matters” in the Prospectus. In giving this consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act.
Very truly yours,
/s/ Davis Polk & Wardwell LLP