EXHIBIT 5.1

                            Opinion of Blank Rome LLP


                         [Letterhead of Blank Rome LLP]

                                                                   May 3, 2004

NCO Group, Inc.
507 Prudential Road
Horsham, Pennsylvania 19044

         Re:  NCO Group, Inc.
              Registration Statement on Form S-3

Gentlemen:

         We have acted as counsel to NCO Group, Inc. (the "Company") in
connection with the Registration Statement on Form S-3 (the "Registration
Statement") filed by the Company with the Securities and Exchange Commission
pursuant to the Securities Act of 1933, as amended, relating to the offer and
sale of up to 142,223 shares of the Company's common stock, no par value (the
"Shares"), by the selling shareholders named in the Registration Statement (the
"Selling Shareholders"). This opinion is furnished pursuant to the requirements
of Item 601(b)(5) of Regulation S-K.

         In rendering this opinion, we have examined only the following
documents: (i) the Company's Amended and Restated Articles of Incorporation and
all amendments thereto; (ii) the Company's Amended and Restated Bylaws and all
amendments thereto; (iii) resolutions adopted by the Company's Board of
Directors relating to the transactions contemplated by the Registration
Statement; (iv) the Registration Statement; (v) Form of Warrant issued to the
Selling Shareholders (the "Warrant"); and (vi) such other documents as we deemed
necessary to render this opinion. We have not performed any independent
investigation other than the document examination described. Our opinion is
therefore qualified in all respects by the scope of that document examination.
We have assumed and relied, as to questions of fact and mixed questions of law
and fact, on the truth, completeness, authenticity and due authorization of all
certificates, documents and records examined and the genuineness of all
signatures. In rendering this opinion we have assumed that 31,338,000 shares of
the Company's common stock are outstanding. This opinion is limited to the laws
of the Commonwealth of Pennsylvania.

         Based upon and subject to the foregoing, we are of the opinion that the
Shares which are being offered and sold by the Selling Shareholders pursuant to
the Registration Statement, when issued to and paid for by the Selling
Shareholders in accordance with the terms of the Warrants, will be legally
issued, fully paid and non-assessable.

         We hereby consent to the filing of this opinion as an Exhibit to the
Registration Statement and to the reference to our firm under the caption "Legal
Matters" in the Prospectus, which is part of the Registration Statement.


                                                  Sincerely,

                                                  /s/ Blank Rome LLP
                                                  --------------------
                                                  BLANK ROME LLP