EX-5.1

Exhibit 5.1

[Letterhead of Fried, Frank, Harris, Shriver & Jacobson LLP]

September 13, 2019

Catalent, Inc.

14 Schoolhouse Road

Somerset, New Jersey 08873

Ladies and Gentlemen:

We are acting as counsel to Catalent, Inc., a Delaware corporation (the “Company”), in connection with the Registration Statement on Form S-3, as may be amended from time to time (the “Registration Statement”), under the Securities Act of 1933, as amended (the “Securities Act”), with respect to the contemplated issuance from time to time, as set forth in the primary offering base prospectus contained in the Registration Statement (the “Prospectus”) and as may be set forth in one or more supplements to the Prospectus (each, a “Prospectus Supplement”) by the Company, of an unlimited amount of (i) shares (the “Common Shares”) of the Company’s common stock, par value $0.01 per share (the “Common Stock”), and (ii) shares (the “Preferred Shares” and, together with the Common Shares, the “Shares”) of the Company’s preferred stock, par value $0.01 per share (the “Preferred Stock”). With your permission, all assumptions and statements of reliance herein have been made without any independent investigation or verification on our part, and we express no opinion with respect to the subject matter or accuracy of such assumptions or items relied upon.

In connection with this opinion, we have (i) investigated such questions of law, (ii) examined originals or certified, conformed, facsimile, electronic or reproduction copies of such agreements, instruments, documents and records of the Company, such certificates of public officials and such other documents (collectively, the “Documents”) and (iii) received such information from officers and representatives of the Company and others, in each case as we have deemed necessary or appropriate for the purposes of this opinion.

In all such examinations, we have assumed the legal capacity of all natural persons, the genuineness of all signatures, the authenticity of original and certified documents and the conformity to original or certified documents of all copies submitted to us as certified, conformed, facsimile, electronic or reproduction copies. As to various questions of fact relevant to the opinions expressed herein, we have relied upon, and assume the accuracy of, the statements, representations and warranties contained in the Documents, certificates and oral or written statements and other information of or from public officials and officers and representatives of the Company and others and assume compliance on the part of all parties to the Documents with their respective covenants and agreements contained therein.

To the extent it may be relevant to the opinions expressed below, we have assumed that the Company will have sufficient authorized but unissued and unreserved shares of Common Stock and Preferred Stock on the date of any issuance of Shares registered pursuant to the Registration Statement.

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

1. When (i) the Registration Statement, and any amendments thereto (including any post-effective amendments) have become effective under the Securities Act, (ii) the terms of the issuance and sale of the Common Shares by the Company registered pursuant to the Registration Statement have been duly approved by the Board of Directors of the Company or an authorized committee thereof (the “Board”) in conformity with the Company’s third amended and restated certificate of incorporation (the “Certificate of Incorporation”) and the Company’s bylaws (the “Bylaws”) and all other necessary corporate action on the part of the Company has been taken in connection therewith and in a manner so as not to violate any applicable law or result in a default under or breach of any agreement or instrument then binding on the Company and so as to comply with any requirement or restriction imposed by any court or governmental body having jurisdiction over the Company, and (iii) such Common Shares have been issued and delivered against payment therefor in an amount in excess of the par value thereof, in accordance with the terms of the agreement under which they are sold and in the manner contemplated by the Registration Statement and/or the applicable Prospectus Supplement, such Common Shares will be validly issued, fully paid and non-assessable.