Exhibit 5.1

Morgan, Lewis & Bockius LLP

Counselors at Law

1701 Market Street

Philadelphia, PA 19103-2921

215-963-5000

Fax: 215-963-5001

December 11, 2013

UniTek Global Services, Inc.

1777 Sentry Parkway West

Gwynedd Hall, Suite 302

Blue Bell, PA 19422

RE:    UniTek Global Services, Inc. - Registration Statement on Form S-8

Ladies and Gentlemen:

We have acted as counsel to UniTek Global Services, Inc., a Delaware corporation (the “Company”), in connection with the filing of a Registration Statement on Form S-8 (the “Registration Statement”) under the Securities Act of 1933, as amended (the “Act”), with the Securities and Exchange Commission (the “SEC”). The Registration Statement relates to the proposed offering and sale of up to an aggregate of 2,958,617 shares of the Company’s common stock, par value $0.00002 per share (the “Shares”), which may be issued under the Company’s 2013 Omnibus Equity Compensation Plan (the “Plan”).

In connection with this opinion letter, we have examined the Plan, the Registration Statement and originals, or copies certified or otherwise identified to our satisfaction, of the Restated Certificate of Incorporation, as amended to the date hereof, and Bylaws of the Company, as amended to the date hereof, and such other documents, records and other instruments as we have deemed appropriate for purposes of the opinion set forth herein.

We have assumed the genuineness of all signatures, the legal capacity of all natural persons, the authenticity of the documents submitted to us as originals, the conformity with the originals of all documents submitted to us as certified, facsimile or photostatic copies and the authenticity of the originals of all documents submitted to us as copies.

Based upon the foregoing, we are of the opinion that the Shares have been duly authorized by the Company and, when issued and sold by the Company in the manner contemplated by the Registration Statement and in accordance with the terms and conditions of the Plan, will be validly issued, fully paid and non-assessable.

The opinions expressed herein are limited to the General Corporation Law of the State of Delaware.

We hereby consent to the use of this opinion as Exhibit 5.1 to the Registration Statement. In giving such consent, we do not hereby admit that we are acting within the category of persons whose consent is required under Section 7 of the Act or the rules or regulations of the SEC thereunder.

Very truly yours,

/s/ Morgan, Lewis & Bockius LLP