================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                -----------------

                                    FORM 8-A

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

                                -----------------

                CALAMOS CONVERTIBLE OPPORTUNITIES AND INCOME FUND
             (Exact Name of Registrant as Specified in Its Charter)

          DELAWARE                                          03-0426532
   (State of Incorporation                               (I.R.S. Employer
      or Organization)                                  Identification No.)

                           1111 EAST WARRENVILLE ROAD
                         NAPERVILLE, ILLINOIS 60536-1493
                    (Address of Principal Executive Offices)

         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: 333-86678

         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
             without par value

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

                                      NONE
                                (Title of Class)


================================================================================



ITEM 1.  DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.

         The shares (the "Shares") to be registered hereunder are common shares
of beneficial interest, without par value, of Calamos Convertible Opportunities
and Income Fund (the "Registrant"). A description of the Shares is contained
under the heading "Description of Shares" in the prospectus included in the
Registrant's registration statement on Form N-2 filed under the Securities Act
of 1933, as amended, and the Investment Company Act of 1940, as amended, on
April 22, 2002 (Registration Nos. 333-86678 and 811-21080, respectively), (the
"Original Registration Statement") as amended by Pre-Effective Amendment No. 1
to the Original Registration Statement, as filed with the Commission on May 24,
2002, which description is incorporated herein by reference.

ITEM 2.  EXHIBITS.

         Pursuant to the Instructions as to Exhibits, no exhibits are filed
herewith or incorporated herein by reference.


                                        2


                                   SIGNATURES

         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 its behalf by the undersigned, thereto duly authorized.

Dated:  June 12, 2002

                                      CALAMOS CONVERTIBLE OPPORTUNITIES
                                      AND INCOME FUND


                                      By: /s/ James S. Hamman, Jr.
                                         ------------------------------------
                                         James S. Hamman, Jr.
                                         Secretary




                                        3