EXHIBIT 5.1
 
                               September 29, 1998
 
TeleTech Holdings, Inc.
1700 Lincoln Street
Suite 1400
Denver, Colorado 80203
 
    RE:    TELETECH HOLDINGS, INC.
        REGISTRATION STATEMENT ON FORM S-3
 
Ladies and Gentlemen:
 
    We have acted as counsel to TeleTech Holdings, Inc., a Delaware corporation
(the "Company"), in connection with the preparation and filing with the
Securities and Exchange Commission, under the Securities Act of 1933, as
amended, of the Company's Registration Statement on Form S-3 (the "Registration
Statement") relating to the proposed offering of 606,343 shares of Common Stock,
par value $.01 (the "Common Stock"), of the Company by certain selling
shareholders.
 
    As such counsel, we have examined such agreements, resolutions, documents
and certificates of or executed by officers and directors of the Company, and
such other records, documents and instruments as we deemed relevant and
necessary as the basis for the opinion hereafter expressed. In such
examinations, we have assumed the genuineness of all signatures and the
authenticity of all documents submitted to us as originals and the conformity to
original documents of all documents submitted to us as conformed or photostatic
copies.
 
    Based upon the foregoing, we are of the opinion that the shares of Common
Stock that are the subject of the Registration Statement have been duly and
validly issued and are 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 heading "Legal
Matters" in the Prospectus comprising a part of the Registration Statement.
 
    Please be advised that certain partners of and attorneys associated with our
firm, beneficially own shares of Common Stock.
 

                                              
                                                 Very truly yours,
 
                                                       /S/ NEAL, GERBER & EISENBERG