SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                               (Amendment No. 8)*

                          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)

                                February 8, 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

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      High  River  Limited  Partnership

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      3,224,057

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      3,224,057

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      3,224,057

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      2.94%

14  TYPE  OF  REPORTING  PERSON
      PN



                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Hopper  Investments  LLC

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      3,224,057

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      3,224,057

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      3,224,057

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      2.94%

14  TYPE  OF  REPORTING  PERSON
      OO




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Barberry  Corp.

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      3,224,057

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      3,224,057

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      3,224,057

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      2.94%

14  TYPE  OF  REPORTING  PERSON
      CO




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Icahn  Partners  Master  Fund  LP

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Cayman  Islands

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      5,568,678

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      5,568,678

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      5,568,678

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      5.08%

14  TYPE  OF  REPORTING  PERSON
      PN




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Icahn  Partners  Master  Fund  II  LP

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Cayman  Islands

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      1,632,955

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      1,632,955

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      1,632,955

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      1.49%

14  TYPE  OF  REPORTING  PERSON
      PN




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Icahn  Partners  Master  Fund  III  LP

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Cayman  Islands

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      786,410

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      786,410

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      786,410

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      0.72%

14  TYPE  OF  REPORTING  PERSON
      PN



                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Icahn  Offshore  LP

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      7,988,043

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      7,988,043

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      7,988,043

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      7.28%

14  TYPE  OF  REPORTING  PERSON
      PN




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Icahn  Partners  LP

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      4,908,189

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      4,908,189

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      4,908,189

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      4.48%

14  TYPE  OF  REPORTING  PERSON
      PN




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Icahn  Onshore  LP

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      4,908,189

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      4,908,189

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      4,908,189

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      4.48%

14  TYPE  OF  REPORTING  PERSON
      PN




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Icahn  Capital  LP

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      12,896,232

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      12,896,232

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      12,896,232

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      11.76%

14  TYPE  OF  REPORTING  PERSON
      PN




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      IPH  GP  LLC

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      12,896,232

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      12,896,232

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      12,896,232

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      11.76%

14  TYPE  OF  REPORTING  PERSON
      OO




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Icahn  Enterprises  Holdings  L.P.

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      12,896,232

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      12,896,232

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      12,896,232

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      11.76%

14  TYPE  OF  REPORTING  PERSON
      PN




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Icahn  Enterprises  G.P.  Inc.

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      12,896,232

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      12,896,232

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      12,896,232

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      11.76%

14  TYPE  OF  REPORTING  PERSON
      CO




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Beckton  Corp.

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS
      WC

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      12,896,232

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      12,896,232

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      12,896,232

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      11.76%

14  TYPE  OF  REPORTING  PERSON
      CO




                                  SCHEDULE 13D

CUSIP No. 587200106

1   NAME  OF  REPORTING  PERSON
      Carl  C.  Icahn

2   CHECK  THE  APPROPRIATE  BOX  IF  A  MEMBER  OF  A  GROUP
      (a) / /
      (b) / /

3   SEC  USE  ONLY

4   SOURCE  OF  FUNDS

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
    2(d)  or  2(e)     /  /

6   CITIZENSHIP  OR  PLACE  OF  ORGANIZATION
      United  States  of  America

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7   SOLE  VOTING  POWER
      0

8   SHARED  VOTING  POWER
      16,120,289

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      16,120,289

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      16,120,289

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES    / /

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      14.70%

14  TYPE  OF  REPORTING  PERSON
      IN




                                  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 3. Source and Amount of Funds or Other Consideration

     Item 3 of the Initial 13D is hereby amended and restated in its entirety as
follows:

     The  Reporting  Persons  hold,  in  the  aggregate,  16,120,289 Shares. The
aggregate  purchase  price  of  the  Shares  purchased  by the Reporting Persons
collectively  was  $146,433,694  (including  commissions  and  premiums  for the
options  to  purchase  Shares).  The source of funding for the purchase of these
Shares  was the general working capital of the respective purchasers. The Shares
are  held  by  the  Reporting  Persons  in  margin  accounts together with other
securities. Such margin accounts may from time to time have debit balances. Part
of  the  purchase  price  of  the  Shares purchased by the Reporting Persons was
obtained  through  margin  borrowing. As of the close of business on February 7,
2011,  the  indebtedness  of  (i)  High River's margin account was approximately
$767,237,936,  (ii)  Icahn  Partners'  margin  account  was  approximately
$577,082,565,  (iii)  Icahn  Master's  margin  account  was  approximately
$756,279,432,  (iv)  Icahn  Master  II's  margin  account  was  approximately
$285,031,934,  and  (v)  Icahn  Master  III's  margin  account was approximately
$66,422,893.

Item 4. Purpose of Transaction.

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

     Mentor  Graphics  Corporation  (the "Company") on Friday, February 4, 2010,
announced  that  it  will hold its 2011 annual meeting of shareholders six weeks
earlier  than  last  year, and left shareholders with only 10 days to nominate a
dissident  slate. We, at that time, called the Company and stated that, in light
of  our  prior friendly discussions, we viewed the announcement as a hostile and
unprovoked  defensive tactic intended to impede shareholder rights. We asked the
Company  to  rescind  the  announcement,  which  it  refused to do. We therefore
currently  intend to nominate three individuals for election as directors of the
Company  at  the  2011  annual  meeting,  but  reserve  the  right to nominate a
different  number  of  individuals,  up to a full slate. We intend to notify the
Company  as  to  the  composition  of  our  slate  prior  to  the new deadline.

     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 5. Interest in Securities of the Issuer

     Item 5 of the Initial 13D is hereby amended and restated in its entirety as
follows:

     (a)  The  Reporting  Persons  may  be  deemed  to  beneficially own, in the
aggregate,  16,120,289 Shares, representing approximately 14.70% of the Issuer's
outstanding  Shares  (based upon the 109,672,191 Shares stated to be outstanding
as  of  December  3, 2010 by the Issuer in the Issuer's quarterly report on Form
10-Q  filed  with  the  Securities and Exchange Commission on December 7, 2010).

     (b) High River has sole voting power and sole dispositive power with regard
to  3,224,057  Shares.  Each of Hopper, Barberry and Mr. Icahn has shared voting
power  and shared dispositive power with regard to such Shares. Icahn Master has
sole  voting  power  and sole dispositive power with regard to 5,568,678 Shares.
Each  of  Icahn  Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn
Enterprises  GP,  Beckton  and  Mr.  Icahn  has  shared  voting power and shared
dispositive  power  with  regard to such Shares. Icahn Master II has sole voting
power  and sole dispositive power with regard to 1,632,955 Shares. Each of Icahn
Offshore,  Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP,
Beckton  and Mr. Icahn has shared voting power and shared dispositive power with
regard  to  such  Shares.  Icahn  Master  III  has  sole  voting  power and sole
dispositive  power  with regard to 786,410 Shares. Each of Icahn Offshore, Icahn
Capital,  IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr.
Icahn  has  shared voting power and shared dispositive power with regard to such
Shares.  Icahn  Partners  has  sole voting power and sole dispositive power with
regard  to  4,908,189  Shares.  Each of Icahn Onshore, Icahn Capital, IPH, Icahn
Enterprises  Holdings,  Icahn  Enterprises  GP, Beckton and Mr. Icahn has shared
voting  power  and  shared  dispositive  power  with  regard  to  such  Shares.

     Each of Hopper, Barberry and Mr. Icahn, by virtue of their relationships to
High  River  (as  disclosed in Item 2), may be deemed to indirectly beneficially
own  (as that term is defined in Rule 13d-3 under the Act) the Shares which High
River  directly  beneficially  owns.  Each  of  Hopper,  Barberry  and Mr. Icahn
disclaims  beneficial  ownership  of such Shares for all other purposes. Each of
Icahn  Offshore,  Icahn  Capital,  IPH,  Icahn  Enterprises  Holdings,  Icahn
Enterprises  GP, Beckton and Mr. Icahn, by virtue of their relationships to each
of  Icahn Master, Icahn Master II and Icahn Master III (as disclosed in Item 2),
may  be  deemed  to indirectly beneficially own (as that term is defined in Rule
13d-3  under the Act) the Shares which each of Icahn Master, Icahn Master II and
Icahn  Master  III  directly  beneficially  owns.  Each of Icahn Offshore, Icahn
Capital,  IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr.
Icahn disclaims beneficial ownership of such Shares for all other purposes. Each
of  Icahn  Onshore,  Icahn  Capital,  IPH,  Icahn  Enterprises  Holdings,  Icahn
Enterprises GP, Beckton and Mr. Icahn, by virtue of their relationships to Icahn
Partners  (as disclosed in Item 2), may be deemed to indirectly beneficially own
(as  that  term  is  defined in Rule 13d-3 under the Act) the Shares which Icahn
Partners  directly beneficially owns. Each of Icahn Onshore, Icahn Capital, IPH,
Icahn  Enterprises  Holdings,  Icahn  Enterprises  GP,  Beckton  and  Mr.  Icahn
disclaims  beneficial  ownership  of  such  Shares  for  all  other  purposes.

     (c)  There  were no transactions with respect to the Shares effected by the
Reporting  Persons  during  the  past  sixty  days.




                                   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:  February  8,  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]