SCHEDULE 14A
                   Proxy Statement Pursuant to Section 14(a)
                     of the Securities Exchange Act of 1934
                               (Amendment No. __)


Filed by the Registrant                    [ ]

Filed by a Party other than the Registrant [x]

Check the appropriate box:

[ ]   Preliminary  Proxy  Statement
[ ]   Confidential,  for  Use  of  the  Commission Only (as permitted by Rule
      14a-6(e)(2))
[ ]   Definitive  Proxy  Statement
[ ]   Definitive  Additional  Materials
[X]   Soliciting  Material  Pursuant  to   240.14a-12

                          Mentor Graphics Corporation
                (Name of Registrant as Specified In Its Charter)

                               Icahn Partners LP
                         Icahn Partners Master Fund LP
                        Icahn Partners Master Fund II LP
                       Icahn Partners Master Fund III LP
                         High River Limited Partnership
                             Hopper Investments LLC
                                 Barberry Corp.
                                Icahn Onshore LP
                               Icahn Offshore LP
                               Icahn Capital L.P.
                                   IPH GP LLC
                        Icahn Enterprises Holdings L.P.
                          Icahn Enterprises G.P. Inc.
                                 Beckton Corp.
                                 Carl C. Icahn
                                  Brett Icahn
                                David Schechter
                                  Gary Meyers
                               Jose Maria Alapont
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (check the appropriate box):

[X]   No  fee  required.

[ ]   Fee computed on table below per Exchange Act Rule 14a-6(i)(4) and 0-11.

          1) Title of each class of securities to which transaction applies:

          2) Aggregate number of securities to which transaction applies:

          3) Per unit price or other underlying value of transaction computed
             pursuant to Exchange Act Rule 0-11 (set forth the amount on which
             the filing fee is calculated and  state  how  it  was  determined):

          4) Proposed maximum aggregate value of transaction:

          5) Total fee paid:



[ ]   Fee  paid  previously  with  preliminary  materials.

[ ]   Check  box if any part of the fee is offset as provided by Exchange Act
      Rule 0-11(a)(2) and  identify the filing for which the offsetting fee was
      paid previously.  Identify the  previous filing by registration statement
      number, or the  Form  or  Schedule  and  the  date  of  its  filing.

          1) Amount Previously Paid:

          2) Form, Schedule or Registration Statement No.:

          3) Filing Party:

          4) Date Filed:



On  March  31, 2011, Carl C. Icahn and affiliated entities filed an amendment to
their  Schedule  13D relating to Mentor Graphics Corporation, a copy of which is
filed  herewith  as  Exhibit  1.

SECURITY  HOLDERS  ARE  ADVISED  TO READ THE PROXY STATEMENT AND OTHER DOCUMENTS
RELATED  TO THE SOLICITATION OF PROXIES BY CARL C. ICAHN AND HIS AFFILIATES FROM
THE  STOCKHOLDERS  OF  MENTOR  GRAPHICS  CORPORATION  FOR USE AT ITS 2011 ANNUAL
MEETING  WHEN  THEY  BECOME  AVAILABLE  BECAUSE  THEY  WILL  CONTAIN  IMPORTANT
INFORMATION,  INCLUDING  INFORMATION  RELATING TO THE PARTICIPANTS IN SUCH PROXY
SOLICITATION.  WHEN  COMPLETED, A DEFINITIVE PROXY STATEMENT AND A FORM OF PROXY
WILL  BE  MAILED TO STOCKHOLDERS OF MENTOR GRAPHICS CORPORATION AND WILL ALSO BE
AVAILABLE  AT  NO  CHARGE AT THE SECURITIES AND EXCHANGE COMMISSION'S WEBSITE AT
HTTP://WWW.SEC.GOV.  INFORMATION  RELATING  TO  THE  PARTICIPANTS  IN SUCH PROXY
SOLICITATION  IS  CONTAINED  IN  THE PRELIMINARY PROXY STATEMENT ON SCHEDULE 14A
FILED  BY  CARL  C.  ICAHN  AND  HIS AFFILIATES WITH THE SECURITIES AND EXCHANGE
COMMISSION  ON  MARCH  17,  2011.






                                                                       EXHIBIT 1


                        Amendment No. 15 to Schedule 13D

                                 [see attached]


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 15)*

                          Mentor Graphics Corporation
                                (Name of Issuer)

                        Common Stock, without par value
                         (Title of Class of Securities)

                                   587200106
                                 (CUSIP Number)

                                  Marc Weitzen
                                Icahn Capital LP
                          767 Fifth Avenue, 47th Floor
                            New York, New York 10153
                                 (212) 702-4300
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                                 March 31, 2011
            (Date of Event which Requires Filing of this Statement)

If  the filing person has previously filed a statement on Schedule 13G to report
the  acquisition  that  is  the subject of this Schedule 13D, and is filing this
schedule  because  of  Section 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check
the  following  box  /  /.

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to  whom  copies  are  to  be  sent.

*The  remainder  of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent  amendment  containing  information  which  would  alter
disclosures  provided  in  a  prior  cover  page.

The information required on the remainder of this cover page shall not be deemed
to  be  "filed"  for the purpose of Section 18 of the Securities Exchange Act of
1934  ("Act") or otherwise subject to the liabilities of that section of the Act
but  shall  be  subject  to  all  other  provisions of the Act (however, see the
Notes).



                                  SCHEDULE 13D

Item 1. Security and Issuer

     The  Schedule  13D filed with the Securities and Exchange Commission on May
27,  2010  (the  "Initial  13D"),  by  the Reporting Persons with respect to the
shares  of  Common  Stock,  without  par  value (the "Shares"), issued by Mentor
Graphics Corporation (the "Issuer"), is hereby amended to furnish the additional
information  set  forth  herein.  All capitalized terms contained herein but not
otherwise  defined shall have the meanings ascribed to such terms in the Initial
13D.

Item 4. Purpose of Transaction.

     Item  4  of  the  Initial  13D  is  hereby  amended  to  add the following:

     On  March  31,  2011,  Carl  C.  Icahn  delivered  a letter to the board of
directors  of  the  Issuer,  a copy of which is filed herewith as an exhibit and
incorporated  herein  by  reference.

SECURITY  HOLDERS  ARE  ADVISED  TO READ THE PROXY STATEMENT AND OTHER DOCUMENTS
RELATED  TO THE SOLICITATION OF PROXIES BY CARL C. ICAHN AND HIS AFFILIATES FROM
THE  STOCKHOLDERS  OF  MENTOR  GRAPHICS  CORPORATION  FOR USE AT ITS 2011 ANNUAL
MEETING  WHEN  THEY  BECOME  AVAILABLE  BECAUSE  THEY  WILL  CONTAIN  IMPORTANT
INFORMATION,  INCLUDING  INFORMATION  RELATING TO THE PARTICIPANTS IN SUCH PROXY
SOLICITATION.  WHEN  COMPLETED, A DEFINITIVE PROXY STATEMENT AND A FORM OF PROXY
WILL  BE  MAILED TO STOCKHOLDERS OF MENTOR GRAPHICS CORPORATION AND WILL ALSO BE
AVAILABLE  AT  NO  CHARGE AT THE SECURITIES AND EXCHANGE COMMISSION'S WEBSITE AT
HTTP://WWW.SEC.GOV.

Item 6. Contracts, Arrangements, Understandings or Relationship with Respect to
        Securities of the Issuer

     The  information  set  forth  above  in  Item  4  is incorporated herein by
reference.

Item 7. Material to be Filed as Exhibits

     1.   Letter  dated  March  31,  2011,  from  Carl  C. Icahn to the board of
          directors  of  the  Issuer.





                                   SIGNATURE

     After  reasonable  inquiry  and  to  the  best  of  each of the undersigned
knowledge and belief, each of the undersigned certifies that the information set
forth  in  this  statement  is  true,  complete  and  correct.

Dated: March 31, 2011


ICAHN  PARTNERS  MASTER  FUND  LP
ICAHN  PARTNERS  MASTER  FUND  II  LP
ICAHN  PARTNERS  MASTER  FUND  III  LP
ICAHN  OFFSHORE  LP
ICAHN  PARTNERS  LP
ICAHN  ONSHORE  LP
BECKTON  CORP.
HOPPER  INVESTMENTS  LLC
BARBERRY  CORP.
HIGH  RIVER  LIMITED  PARTNERSHIP
     By:  Hopper  Investments  LLC,  general  partner

     By:  /s/  Edward  E.  Mattner
          ------------------------
          Name:  Edward  E.  Mattner
          Title:  Authorized  Signatory


ICAHN  CAPITAL  LP
     By:  IPH  GP  LLC,  its  general  partner
     By:  Icahn  Enterprises  Holdings  L.P.,  its  sole  member
By:  Icahn  Enterprises  G.P.  Inc.,  its  general  partner
IPH  GP  LLC
     By:  Icahn  Enterprises  Holdings  L.P.,  its  sole  member
By:  Icahn  Enterprises  G.P.  Inc.,  its  general  partner
ICAHN  ENTERPRISES  HOLDINGS  L.P.
     By:  Icahn  Enterprises  G.P.  Inc.,  its  general  partner
ICAHN  ENTERPRISES  G.P.  INC.

     By:  /s/  Dominick  Ragone
          ---------------------
          Name:  Dominick  Ragone
          Title:  Chief  Financial  Officer




/s/  Carl  C.  Icahn
--------------------
CARL  C.  ICAHN



         [Signature Page of Schedule 13D - Mentor Graphics Corporation]



EXHIBIT A
---------


                             FOR IMMEDIATE RELEASE

                       ICAHN COMMENTS ON MENTOR GRAPHICS


New York, New York, March 31, 2011
Contact: Susan Gordon (212) 702-4309

Carl  C.  Icahn  announced today that the following letter has been delivered to
the  board  of  directors  of  Mentor  Graphics  Corporation:



                                 CARL C. ICAHN
                          767 Fifth Avenue, 47th Floor
                            New York, New York 10153


                                 March 31, 2011

VIA FEDERAL EXPRESS AND EMAIL
-----------------------------
Board of Directors
Mentor Graphics Corporation
8005 S.W. Boeckman Road
Wilsonville, OR 97070-7777

Gentlemen and Ladies:

     Your  basis  for rejecting our offer to acquire Mentor Graphics was that it
"undervalues  the  company  and  its  future prospects." Yet, one day later, you
announced  the  issuance  of convertible notes, but maintained sub rosa the fact
that it may be massively dilutive to shareholders if the company is sold. We are
confident  that when you disclose all of the terms of the notes the shareholders
will  see  and  understand  the  cynical  nature  of  your  acts.

     In  your press release, you claim "the high level of institutional investor
interest  in  our new convertible debt offering resulted in attractive terms for
the  company  and  demonstrated  strong  investor  support for Mentor's business
strategy  and  long-term  prospects"  but  you  failed  to mention the poisonous
"make-whole" provision of this offer. The effect of this make-whole provision is
that,  in  the  event  of  a  sale of the company during the no-call period, the
conversion  price  of this debt may decrease dramatically from $20.54. Depending
on  time and price, it could fall close to where the company's stock was trading
when  you  announced  this  absurd  offering.  In our opinion, this is a blatant
attempt  to  derail  an  acquisition  proposal.  Perhaps  this  "high  level  of
institutional  investor  interest"  is  motivated by the fact that they could be
effectively  purchasing  stock for almost as low as the current market price (to
the  extent  the  company  is  sold)  with  the  downside  protection  of a debt
instrument.

     We  ask  that  the  company immediately make public all of the terms of the
deal  so  that  shareholders  can  evaluate  what  you  have  done.  We would be
especially  interested  to know what will happen if the company is sold over the
next few years. Since we strongly believe the company should be sold, it appears
to  us that you may have in effect just sold a significant number of shares at a
price  well  below  our  $17  per  share  offer,  which  you  told  shareholders
"undervalues  the  company  and  its  future  prospects."

     Your  shareholders  are not irrelevant and will not be fooled. There was no
need  to  issue  convertible  securities and there were clear alternatives. Even
though  you  gave  your shareholders just one day to react before you priced the
deal, we offered the company a loan with no conversion features and no change of
control  penalties  and even offered to serve as a stalking horse (with no fees)
to  allow  you  to  seek superior offers. Based upon your earnings guidance, you
should  have  been  able to repay our proposed loan during its term, effectively
leaving  the  company  debt  free.  Instead,  you ignored our offer and issued a
dilutive  security  which  may  serve  to  further  entrench and perpetuate your
existence  on  this  Board.

It  seems  that we have been justified in our concern that this Board is willing
to engage in inappropriate defensive transactions in an attempt to thwart a sale
of  the  company.  Perhaps  we  should  have  sought  to  replace  all  of  you.

                                   Very truly yours,


                                   Carl C. Icahn



SECURITY  HOLDERS  ARE  ADVISED  TO READ THE PROXY STATEMENT AND OTHER DOCUMENTS
RELATED  TO THE SOLICITATION OF PROXIES BY CARL C. ICAHN AND HIS AFFILIATES FROM
THE  STOCKHOLDERS  OF  MENTOR  GRAPHICS  CORPORATION  FOR USE AT ITS 2011 ANNUAL
MEETING  WHEN  THEY  BECOME  AVAILABLE  BECAUSE  THEY  WILL  CONTAIN  IMPORTANT
INFORMATION,  INCLUDING  INFORMATION  RELATING TO THE PARTICIPANTS IN SUCH PROXY
SOLICITATION.  WHEN  COMPLETED, A DEFINITIVE PROXY STATEMENT AND A FORM OF PROXY
WILL  BE  MAILED TO STOCKHOLDERS OF MENTOR GRAPHICS CORPORATION AND WILL ALSO BE
AVAILABLE  AT  NO  CHARGE AT THE SECURITIES AND EXCHANGE COMMISSION'S WEBSITE AT
HTTP://WWW.SEC.GOV.  INFORMATION  RELATING  TO  THE  PARTICIPANTS  IN SUCH PROXY
SOLICITATION  IS  CONTAINED  IN  THE PRELIMINARY PROXY STATEMENT ON SCHEDULE 14A
FILED  BY  CARL  C.  ICAHN  AND  HIS AFFILIATES WITH THE SECURITIES AND EXCHANGE
COMMISSION  ON  MARCH  17,  2011.