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


                                     Aviron
- --------------------------------------------------------------------------------
             (Exact Name of Registrant as Specified in its Charter)


               California                              77-0306986
     ------------------------------          ------------------------------
(State of Incorporation or Organization)            (I.R.S. Employer
                                                   Identification no.)

297 North Bernardo Avenue, Mountain View, California               94043
- -----------------------------------------------------            ------------
(Address of principal executive offices)                          (zip code)



If this Form relates to the registration of a class of debt securities and is
effective upon filing pursuant to General Instruction A(c)(1) please check the
following box.  /  /

If this Form relates to the registration of a class of debt securities and is to
become effective simultaneously with the effectiveness of a concurrent
registration statement under the Securities Act of 1933 pursuant to General
Instruction A(c)(2) please check the following box.  /  /

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

         Title of Each Class to              Name of Each Exchange on Which
            be so Registered                 Each Class is to be Registered
         ----------------------              ------------------------------

                  NONE                                    NONE
         ----------------------              ------------------------------


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

                         Common Stock, $0.001 par value
- --------------------------------------------------------------------------------
                                (Title of class)



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

     A description of the Common Stock to be registered hereunder is 
contained in the section entitled "Description of Capital Stock," commencing 
at page 63 of the Prospectus included in the Registrant's Form S-1 
Registration Statement, No. 333-05209, as amended, filed with the Securities 
and Exchange Commission (the "Commission") on June 5, 1996, and is incorporated 
herein by reference.

ITEM 2.        EXHIBITS.

     Exhibit
     Number    Description
     -------   -----------
     3.1       Amended and Restated Articles of Incorporation, as amended. (1)
     3.2       Amendment to the Amended and Restated Articles of Incorporation 
               of the Registrant. (2)
     3.3       Bylaws of the Registrant. (1)
     3.4       Form of Certification of Incorporation of the Registrant to be
               effective upon reincorporation in Delaware. (3)
     3.5       Form of Bylaws of the Registrant to be effective upon
               reincorporation in Delaware. (3)
     3.6       Form of Restated Certificate of Incorporation of the Registrant,
               to be filed after completion of this offering. (3)
     4.2       Specimen Stock Certificate. (3)
     4.8       Investors Rights Agreement, dated July 18, 
               1995, among the Registrant and the investors named therein. (1)
     10.4      Stock Transfer Agreement between the Registrant and the Regents
               of the University Michigan, dated February 24, 1995. (1)

     ------------------------------
     (1)  Filed as an exhibit to Registrant's Form S-1 Registration
Statement, with exhibit number same as above, and incorporated herein by 
reference.

     (2)  Filed as an exhibit to Amendment No. 1 to Registrant's Form S-1 
Registration Statement, with exhibit number same as above, and incorporated 
herein by reference.

     (3)  Filed as an exhibit to Amendment No. 2 to Registrant's Form S-1 
Registration Statement, with exhibit number same as above, and incorporated 
herein by reference.



                                    SIGNATURE

     Pursuant to the requirements of Section 12 of the Securities Exchange Act
of 1934, the Registrant has caused this registration statement to be signed on
its behalf by the undersigned, thereunto duly authorized.


                            Aviron
                            ---------------------------
                            (Registrant)


Date: July 16, 1996         By: /s/ J. Leighton Read, M.D.
                            ----------------------------
                            J. Leighton Read, M.D. Chairman, Chief Executive
                            Officer and Chief Financial Officer