<DOCUMENT>
<TYPE>8-A12B
<SEQUENCE>1
<FILENAME>tmbwof8a.txt
<DESCRIPTION>EATON VANCE TAX-MANAGED BUY-WRITE OPPORTUNITIES FUND FORM 8-A DTD 5-18-05
<TEXT>
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 8-A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(B) OR (G) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


              EATON VANCE TAX-MANAGED BUY-WRITE OPPORTUNITIES FUND
              ----------------------------------------------------
             (Exact Name of Registrant as Specified in this Charter)

           Massachusetts                               20-2787471
----------------------------------------    ------------------------------------
(State of Incorporation or Organization)    (I.R.S. Employer Identification No.)

     The Eaton Vance Building
         255 State Street
       Boston, Massachusetts                                            02109
---------------------------------------                               ----------
(Address of Principal Executive Office)                               (Zip Code)

     If this form relates to the registration of a class of securities  pursuant
to  Section  12(b) of the  Exchange  Act and is  effective  pursuant  to General
Instruction A.(c), check the following box. [X]

     If this form relates to the registration of a class of securities  pursuant
to  Section  12(g) of the  Exchange  Act and is  effective  pursuant  to General
Instruction A.(d), check the following box. [ ]

Securities  Act  registration  statement file number to which this form relates:
333-123770

Securities to be registered pursuant to Section 12(b) of the Act:

       Title of Each Class                        Name of Each Exchange On Which
       To Be So Registered                        Each Class Is To Be Registered
       -------------------                        ------------------------------

Common Shares of Beneficial Interest,                New York Stock Exchange
     $0.01 Par Value Per Share


Securities to be registered pursuant to Section 12(g) of the Act:

                                      None
                                      ----
                                (Title of Class)


<PAGE>
                 INFORMATION REQUIRED IN REGISTRATION STATEMENT

Item 1: Description of Registrant's Securities to be Registered.

     The  description  of  the  Registrant's  securities  to  be  registered  is
     incorporated  by reference to the  description  contained under the caption
     "Description  of  Capital  Structure"  in  the  Registrant's   Registration
     Statement  on  Form  N-2  (Nos.   333-123770   and   811-21735)   as  filed
     electronically with the Securities and Exchange Commission on April 1, 2005
     (Accession  No.  0000898432-05-000288)  ("Registration  Statement  on  Form
     N-2"), as the same may be amended.

Item 2: Exhibits.

     (a)  The following exhibits are being filed with the Commission:

          1.   Registrant's  Registration  Statement on Form N-2 is incorporated
               herein by reference.

          2.   Declaration   of   Trust   of   Registrant,   which   was   filed
               electronically  as exhibit (a) to the  Registrant's  Registration
               Statement on Form N-2, is incorporated herein by reference.

          3.   By-Laws of Registrant, which were filed electronically as exhibit
               (b) to the Registrant's  Registration  Statement on Form N-2, are
               incorporated herein by reference.


<PAGE>
                                    SIGNATURE


     Pursuant to the  requirements of Section 12 of the Securities  Exchange Act
of 1934, the Registrant has duly caused this registration statement to be signed
on behalf of the  undersigned,  thereto duly  authorized,  this 18th day of May,
2005.


                        EATON VANCE TAX-MANAGED BUY-WRITE OPPORTUNITIES FUND


                        By:     /s/ Duncan W. Richardson
                                ------------------------------------
                                Name:  Duncan W. Richardson
                                Title: President
</TEXT>
</DOCUMENT>
