EXHIBIT - 99.906CERT


SECTION 906 CERTIFICATIONS

We, Peter E. Sundman,  Chief Executive Officer and John McGovern,  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
           April 30, 2005 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: June 28, 2005


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


                                            /s/ John McGovern
                                            -----------------
                                            John McGovern
                                            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  ce
rtification  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.