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

                     Report on Form 6-K dated July 26, 2005

                           Commission File No. 0-28578

                             DASSAULT SYSTEMES S.A.
                              (Name of Registrant)

         9, Quai Marcel Dassault, B.P. 310, 92156 Suresnes Cedex, France
         ---------------------------------------------------------------
                    (Address of Principal Executive Offices)

    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):

                         Yes                    No X
                            ---                   ---

      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):

                         Yes                    No X
                            ---                   ---

 Indicate by check mark whether by furnishing the information contained in this
     Form, the registrant 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-___________


                                   ENCLOSURES:

Dassault Systemes S.A. is furnishing under cover of Form 6-K two press releases
dated July 26, 2005, announcing (i) Dassault Systemes and IBM have strengthened
their strategic partnership to accelerate PLM growth in the SMB Market and (ii)
Dassault Systemes has acquired Unique 3D behavioral technology with purchase of
virtools.




IBM/DASSAULT SYSTEMES GRAPHIC OMITTED

                   Dassault Systemes and IBM Strengthen Their
                      Strategic Partnership to Accelerate
                          PLM Growth in the SMB Market

            Partners streamline channel management model in selected
                    European countries and the United States

Paris, France, July 26, 2005 - Dassault Systemes (DS - Nasdaq: DASTY; Euronext
Paris: #13065, DSY.PA) and IBM today announced the implementation of a new
channel management model designed to improve organizational efficiency and help
IBM Business Partners better capture the growing PLM opportunities in the small
and medium-sized business (SMB) market. While IBM will continue to provide
end-to-end, global PLM solutions, Dassault Systemes will be responsible for
operation of the sales channel of IBM PLM Business Partners in the SMB market in
selected European countries and in the U.S.

Mid-market manufacturers will increase PLM spend at 16% CAGR* through 2008,
according to an AMR Research report. The new Channel Management Provider (CMP)
organization has been established jointly by IBM and Dassault Systemes to
streamline their support to IBM Business Partners in the PLM market and help
accelerate the transition of small and medium- sized customers from CAD to full
PLM implementations. In this new organization, Dassault Systemes will be in
charge of the operational management (sales management, channel enablement and
marketing programs) in the U.S., Germany, Switzerland, the United Kingdom,
Sweden, Russia and the CIS (Commonwealth of Independent States) countries,
leveraging the success of the model already in place in France, Belgium, Monaco,
and Luxembourg.

This is the first of a series of agreements aimed at strengthening and
transforming the IBM-Dassault Systemes partnership to maximize the value of
their PLM offerings. This will help customers, including SMBs, accelerate their
On Demand Business transformation of which Product Lifecycle Management is a key
component and will help IBM and Dassault Systemes increase their global PLM
market share.

In this new model, the contractual relationship between IBM and its Business
Partners in the PLM area remains unchanged, as they continue to be IBM Business
Partners. IBM will continue to have the overall responsibility of marketing,
sales and support of its PLM portfolio of solutions.

"The SMB market is recognizing the tremendous benefits that can be achieved by
implementing PLM," said John Gaydac, director, PLM Transformation, IBM Product
Lifecycle Management Solutions. "Together with Dassault Systemes, we have agreed
on a new and more efficient operational approach for channel management. This
new level of teaming will allow IBM and DS--along with our Business Partners--to
deliver increased value to our SMB clients, enabling them to realize the full
value of PLM."

"This new development is a major evolution of our long-lasting partnership with
IBM and demonstrates our continuous dedication to provide our PLM channel with
best-in-class skills and resources for sales, marketing and technical support,"
said Etienne Droit, executive vice president, Sales and Distribution, Dassault
Systemes. "V5 PLM brings tremendous innovation capabilities to our customers. We
see this evolution as a unique opportunity to accelerate the adoption of V5 PLM,
and expand into new markets in Europe and the US."


                                       ###


*compound annual growth rate






About IBM
IBM is the world's largest technological company, providing leadership and
innovation throughout the world for more than 80 years. IBM is the largest
supplier of "hardware", "software" and Information Technology services, and
pioneered the development and implementation of On-Demand business. IBM Sales &
Distribution, which supports more than a dozen key industries worldwide, works
with companies of all sizes around the world to deploy the full range of IBM
technologies. The fastest way to get more information about IBM is through the
IBM home page at http://www.ibm.com
                 ------------------

About Dassault Systemes
As world leader in 3D and PLM (Product Lifecycle Management) solutions, the
Dassault Systemes group brings value to more than 80,000 customers in 80
countries. A pioneer in the 3D software market since 1981, Dassault Systemes
develops and markets PLM application software and services that support
industrial processes and provide a 3D vision of the entire life cycle of
products from conception to maintenance. Its offering includes integrated PLM
solutions for product development (CATIA(R), DELMIA(R), ENOVIA(R), SMARTEAM(R)),
mainstream 3D design tools (SolidWorks(R)), and 3D components (Spatial/ACIS(R)).
Dassault Systemes is listed on the Nasdaq (DASTY) and Euronext Paris (#13065,
DSY.PA) stock exchanges. For more information, visit http://www.3ds.com
                                                     ------------------

             IBM Press Contact:        Dassault Systemes Press
             Zohra Dali                Contacts:
             +33 6 71 92 71 87         Anthony Marechal
             zohradali@fr.ibm.com      + 33 (0)1 55 49 84 21
             --------------------      anthony marechal@ds-fr.com
                                       --------------------------
             Seena Peck (Americas)
             +1 (212) 745-2633         Emma Rutherford (Financial
             speck@us.ibm.com          Dynamics)
             ----------------          +33 1 47 03 68 10
                                       emma.rutherford@fd.com
                                       ----------------------

                                       Derek Lane (Americas)
                                       +1 (818) 673-2243
                                       derek lane@ds-us.com
                                       --------------------





[DASSAULT SYSTEMES GRAPHIC OMITTED]

                 Dassault Systemes Acquires Unique 3D Behavioral
                      Technology with Purchase of Virtools

                DS to provide interactive 3D experience platform
                               to give life to 3D

Paris, France, July 26, 2005 - Dassault Systemes (Nasdaq: DASTY; Euronext Paris:
#13065, DSY.PA) today announced that it has acquired Paris-based Virtools SA, a
team of experts in 3D interactive web applications that give live behavior to 3D
content, for approximately 12 million euros.

Virtools' applications allow users not familiar with 3D modeling to quickly and
easily add life experience to any 3D object. As an example, using the company's
technology, users can experience the shopping behavior of a typical consumer in
a supermarket or visualize the ergonomics of a driver as he or she drives a car
through a city.

Virtools' comprehensive software solutions enable companies to give life to 3D
by creating applications with rich game-like 3D interactivity. Virtools has many
production customers in industrial design, marketing, 3D web-based CRM
applications, and multimedia applications as well as in video game development.
Customers include Procter & Gamble, L'Oreal, Microsoft Game Studio, Electronic
Arts, PSA Peugeot Citroen, and EADS.

"We chose Virtools several years ago to build our 3D real-time interactive
applications, such as spatial mission experiences and the virtual cockpit," said
Nicolas Chevassus, Corporate Research Center, EADS. "The combination of Virtools
and Dassault Systemes reinforces our strategic partnership."

With this acquisition, DS is adding to its R&D force a core team of expert
pioneers in 3D Interactivity. Virtools brings to DS breakthrough technologies
that will accelerate the use of 3D for all types of real-time, interactive
consumer applications on the web. As a development platform, Virtools provides
next-generation solutions for developing highly realistic 3D experiences with
"game-like" interactivity, as well as distributing and running 3D applications
on the web. These solutions range from browser-based applications to large-scale
3D visualizations.

"The visionary R&D team at Virtools will be an immediate asset to DS as we
execute our strategy of democratizing 3D," said Bernard Charles, president and
CEO, Dassault Systemes. "By combining our assets, we will deliver the
next-generation 3D Web platform that will enable a wide range of users to
imagine, share, and experience in 3D."

"I am delighted that Dassault Systemes has chosen Virtools as a foundation of
its 3D democratization strategy," said Bertrand Duplat, founder and CTO of
Virtools. "We share the vision of market convergence with DS for extended use of
interactive 3D."

"I look forward to the contribution that Virtools will bring to Dassault
Systemes," said Herve Yahi, CEO of Virtools. "We will continue to serve our
customers and will enhance and improve support worldwide."


                                       ###


About Virtools
Virtools, whose majority stake was held by Ventech and CDC Entreprises
Innovation, was formed in 1993 with consulting and services targeting the VR
sector. With the needs of this and other key markets in mind, Virtools built the
company's initial software solution, Virtools Dev. As an Independent Software
Vendor since mid 1999, Virtools has become the leading provider of comprehensive
software development solutions for building highly interactive 3D content. With
several thousands of users throughout the world, the Virtools Software Suite
enables prototyping, development and deployment of offline and online/networked
video games, along with applications in the fields of industrial
simulation/virtual reality and marketing/multimedia. Virtools clients include
industry leaders such as Procter & Gamble, EDF, EADS, CEA, PSA Peugeot Citroen,
CNRS, France Telecom, Matsushita, US Department of Energy, Intel, Publicis
Networks, Arte TV and L'Oreal, as well as major game studios such as Electronic
Arts, Microids, Sony Computer Entertainment, Microsoft Game Studio, Warner Bros
Online, Blue Fang Games and Ubisoft. Virtools' strategic partners include Barco,
Orad, HP, Intersense, Ascension Technologies, Advanced Realtime Tracking,
Microsoft, and Sony. For more information, visit www.virtools.com

About Dassault Systemes
As world leader in 3D and PLM (Product Lifecycle Management) solutions, the
Dassault Systemes group brings value to more than 80,000 customers in 80
countries. A pioneer in the 3D software market since 1981, Dassault Systemes
develops and markets PLM application software and services that support
industrial processes and provide a 3D vision of the entire life cycle of
products from conception to maintenance. Its offering includes integrated PLM
solutions for product development (CATIA(R), DELMIA(R), ENOVIA(R), SMARTEAM(R)),
mainstream 3D design tools (SolidWorks(R)), and 3D components (Spatial/ACIS(R)).
Dassault Systemes is listed on the Nasdaq (DASTY) and Euronext Paris (#13065,
DSY.PA) stock exchanges. For more information, visit http://www.3ds.com




                                                                         
Virtools  Press Contacts:          Dassault Systemes Press Contacts:           Dassault Systemes Investor
Julie Ercolani                      Anthony Marechal                           Relations Contacts:
ercolani@virtools.com              + 33 (0)1 55 49 84 21                       Geraldine Nithart-Riva/Valerie Agathon
---------------------              anthony marechal@ds-fr.com                  +33 1 40 99 69 24
Karine Guilbert                    --------------------------                  investors@ds-fr.com
guilbert@virtools.com                                                          -------------------
---------------------              Emma Rutherford (Financial Dynamics)
+33 1 42 71 46 86                  + 33 1 47 03 68 10
                                   emma.rutherford@fd.com
                                   ----------------------

                                   Derek Lane (Americas)
                                   +1(818) 673-2243
                                   derek lane@ds-us.com
                                   --------------------








                                   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.



                                              DASSAULT SYSTEMES S.A.


     Date: July 26, 2005                      By:    /s/ Thibault de Tersant
                                                     -----------------------
                                              Name:  Thibault de Tersant
                                              Title: Executive Vice President,
                                                     Finance and Administration