Exhibit 5.1

Phone:    (215) 569-5500

Fax:      (215) 569-5555

                                February 11, 2004

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

     Re:  NCO Group, Inc.
          Registration Statement on Form S-4
          ----------------------------------

Gentlemen:

   We have acted as counsel to NCO Group, Inc. ("NCO") in connection with the
Registration Statement on Form S-4 (the "Registration Statement") to be filed on
February 11, 2004 by NCO pursuant to the Securities Act of 1933, as amended (the
"Securities Act"), relating to the issuance of up to 4,692,429 shares of common
stock, no par value, of NCO (the "Shares") in connection with the proposed
merger of NCOG Acquisition Corporation, a Pennsylvania corporation and a wholly
owned subsidiary of NCO, with and into RMH Teleservices, Inc., a Pennsylvania
corporation. This opinion is furnished pursuant to the requirements of Item
601(b)(5) of Regulation S-K under the Securities Act. In rendering this opinion,
we have examined only the documents listed on Exhibit "A" attached hereto and
such other documents as we deemed necessary to render this opinion. We have not
performed any independent investigation other than the document examination
described above. We have assumed and relied on the truth, completeness and
authenticity of all documents and records examined and the genuineness of all
signatures. 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, when issued in the manner contemplated by the Registration Statement,
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 proxy statement/prospectus, which is part of the Registration
Statement.

                                Very truly yours,

                               /s/ Blank Rome LLP

                               BLANK ROME LLP


                                   EXHIBIT "A"

1.   NCO's Amended and Restated Articles of Incorporation and all amendments
     thereto.

2.   NCO's Amended and Restated Bylaws and all amendments thereto.

3.   Good standing certificate issued by the Secretary of the Commonwealth of
     Pennsylvania.

4.   Resolutions adopted by NCO's board of directors relating to the
     transactions contemplated by the Registration Statement.

5.   NCO's Registration Statement.