SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    --------

                                    FORM 6-K

                        REPORT OF FOREIGN PRIVATE ISSUER
                      PURSUANT TO RULE 13a-16 OR 15d-16 OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                          For the month of April, 2005

                                   Serono S.A.
                    ----------------------------------------
                               (Registrant's Name)

                            15 bis, Chemin des Mines
                                 Case Postale 54
                                CH-1211 Geneva 20
                                   Switzerland
                    ----------------------------------------
                    (Address of Principal Executive Offices)

                                     1-15096
                    ----------------------------------------
                              (Commission File No.)

     (Indicate by check mark whether the registrant files or will file annual
reports under cover of Form 20-F or Form 40-F.)

     Form 20-F  X   Form 40-F
               ---            ---

     (Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101 (b)(1).)
                                                       -----

     (Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101 (b)(7).)
                                                       -----

     (Indicate by check mark whether the registrant by furnishing the
information contained in this form is also thereby furnishing the information to
the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.)

     Yes      No  X
         ---     ---

     (If "Yes" is marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b): 82-       )
                                                 ------



                                                                          SERONO


Media Release


FOR IMMEDIATE RELEASE
---------------------




                     SERONO SHAREHOLDERS APPROVE RESOLUTIONS
                            AT ANNUAL GENERAL MEETING


GENEVA, SWITZERLAND, APRIL 26, 2005 - Serono (virt-x: SEO and NYSE: SRA)

Serono  announced that its shareholders have approved all the resolutions at the
Annual  General  Meeting  of  shareholders, held today in Lausanne, Switzerland.

Shareholders approved the following main resolutions:

     -    A cash dividend of CHF 131.1 million or $110.1 million(1)
          (2003: CHF123.9 million or $96.8 million)
     -    Gross dividend per bearer share of CHF 9.00 or $7.56
          (2003: CHF8.00 or $6.25)
     -    Gross dividend per American Depositary Share of CHF 0.23 or $0.19
          (2003: CHF0.20 or $0.15625)
     -    Gross dividend per registered share of CHF 3.60 or $3.03
          (2003: CHF3.20 or $2.50)

The dividend for bearer shares will be paid as of April 29, 2005, net of the 35%
Swiss  withholding tax.  The total cash pay-out in Swiss Francs (CHF) represents
an  increase  of  5.8%  for  the  financial  year  2004 compared with 2003.  The
dividend  pay-out  ratio  in  relation  to  earnings per share is 21.2% for 2004
compared  to  24.3%  for  2003.

Shareholders  approved  the  cancellation  of  962,435 bearer shares, with a par
value of CHF 25.00 each, purchased by the company under its second share buyback
program,  announced  on  May  25,  2004.


-------------------
1  All  dollar  figures are based on prevailing exchange rates. Final equivalent
US$ amounts may differ depending on exchange rates on the date of the payment.


                                                                             1/3

Shareholders approved the re-election for one year of:
     -    Mr. Georges Muller (Chairman)
     -    Mr. Ernesto Bertarelli (Vice Chairman and Managing Director)
     -    Mr. Pierre E. Douaze
     -    Mr. Patrick Gage
     -    Mr. Bernard Mach
     -    Mr. Sergio Marchionne
     -    Mr. Jacques Theurillat

Mr.  Hans  Thierstein did not seek a re-election.  Mr. Georges Muller, on behalf
of  the  Board  as  a  whole,  the  employees and the shareholders of Serono SA,
thanked  him  very much for his remarkable contribution to the company during 25
years,  in particular regarding its international development and its listing on
the  Stock  Exchange.

Shareholders elected Mr. Alberto Togni as a new member of the Board of Serono SA
for  a  one-year  statutory  term. Until 2004, Mr. Togni served as member of the
Board of the Swiss National Bank, delegated by the Swiss Federal Council, and he
is  a member of an Advisory Board of the International Monetary Fund.  Mr. Togni
was the Executive Vice Chairman of the Board of Directors of UBS since 1998.  He
has  stepped  down  from  all  his  functions  within  UBS  on  April  21, 2005.

The  annual  report,  the accounts of Serono SA and the consolidated accounts of
the  Serono  group  for  the  year  2004  were  approved.


                                       ###

Some  of  the  statements  in  this  press  release  are  forward  looking. Such
statements  are inherently subject to known and unknown risks, uncertainties and
other  factors  that  may  cause  actual results, performance or achievements of
Serono  S.A.  and  affiliates  to be materially different from those expected or
anticipated  in  the  forward-looking statements. Forward-looking statements are
based on Serono's current expectations and assumptions, which may be affected by
a  number  of  factors, including those discussed in this press release and more
fully  described  in  Serono's  Annual  Report  on Form 20-F filed with the U.S.
Securities  and Exchange Commission on March 16, 2005. These factors include any
failure  or  delay  in  Serono's ability to develop new products, any failure to
receive  anticipated  regulatory  approvals,  any  problems  in  commercializing
current  products  as  a  result of competition or other factors, our ability to
obtain  reimbursement  coverage  for  our  products,  the  outcome of government
investigations and litigation and government regulations limiting our ability to
sell  our  products.  Serono has no responsibility to update the forward-looking
statements  contained  in  this press release to reflect events or circumstances
occurring  after  the  date  of  this  press  release.

                                       ###


                                                                             2/3

ABOUT SERONO
Serono  is  a  global biotechnology leader.  The Company has eight biotechnology
products,  Rebif(R),  Gonal-f(R),  Luveris(R),  Ovidrel(R)/Ovitrelle(R),
Serostim(R),  Saizen(R),  Zorbtive(TM) and Raptiva(R).  In addition to being the
world  leader  in  reproductive  health,  Serono  has strong market positions in
neurology,  metabolism  and  growth and has recently entered the psoriasis area.
The  Company's  research programs are focused on growing these businesses and on
establishing  new  therapeutic  areas, including oncology.  Currently, there are
approximately  30  ongoing  development  projects.

In  2004,  Serono  achieved  worldwide revenues of US$2,458.1 million, and a net
income  of  US$494.2 million, making it the third largest biotech company in the
world.  Its  products  are  sold  in over 90 countries.  Bearer shares of Serono
S.A.,  the  holding  company,  are  traded  on the virt-x (SEO) and its American
Depositary  Shares  are  traded  on  the  New  York  Stock  Exchange  (SRA).


FOR MORE INFORMATION, PLEASE CONTACT: 

CORPORATE MEDIA RELATIONS:  CORPORATE INVESTOR RELATIONS:
Tel:   +41 22 739 36 00     Tel:   +41 22 739 36 01
Fax:   +41 22 739 30 85     Fax:   +41 22 739 30 22
http://www.serono.com       Reuters: SEO.VX / SRA.N
---------------------       Bloomberg: SEO VX / SRA US

MEDIA RELATIONS, USA:       INVESTOR RELATIONS, USA:
Tel:   +1 781 681 2340      Tel:   +1 781 681 2552
Fax:   +1 781 681 2935      Fax:   +1 781 681 2912
http://www.seronousa.com
------------------------


                                                                             3/3

                                   SIGNATURES

     Pursuant  to  the  requirements of the Securities Exchange Act of 1934, the
registrant  has  duly  caused  this  report  to  be  signed on its behalf by the
undersigned, thereunto duly authorized.



                                        SERONO S.A.
                                        a Swiss corporation
                                        (Registrant)


April 26, 2005                     By:  /s/ Stuart Grant
                                        ------------------------------
                                        Name:  Stuart Grant
                                        Title: Chief Financial Officer