EXHIBIT - 99.906CERT

SECTION 906 CERTIFICATIONS

We, Peter E. Sundman, Chief Executive Officer and Barbara Muinos,  Treasurer and
Principal   Financial  and  Accounting   Officer  of  Neuberger   Berman  Income
Opportunity Fund Inc.  ("Registrant"),  certify,  pursuant to 18 U.S.C.  Section
1350 enacted under Section 906 of the  Sarbanes-Oxley  Act of 2002,  that to our
knowledge:

    1.   The  Registrant's  periodic  report on Form N-CSR for the period  ended
         October 31, 2004 fully complies with the  requirements of Section 13(a)
         or 15(d) of the  Securities  Exchange  Act of 1934 (15  U.S.C.  Section
         78m(a) or 78o(d)); and

    2.   The information  contained in such Form N-CSR fairly  presents,  in all
         material respects, the financial condition and results of operations of
         the Registrant.

Dated: January 7, 2005

                                               /s/ Peter E. Sundman
                                               --------------------
                                               Peter E. Sundman
                                               Chief Executive Officer

                                               /s/ Barbara Muinos
                                               --------------------
                                               Barbara Muinos
                                               Treasurer and Principal Financial
                                               and Accounting Officer

A signed  original of this written  statement  required by Section 906, or other
document authenticating, acknowledging, or otherwise adopting the signature that
appears in typed form within the  electronic  version of this written  statement
required  by  Section  906,  has been  provided  to the  Registrant  and will be
retained  by the  Registrant  and  furnished  to  the  Securities  and  Exchange
Commission or its staff upon request.

This  certification  is being furnished to the Commission  solely pursuant to 18
U.S.C.  ss.  1350 and is not  being  filed as part of the  Form  N-CSR  with the
Commission.