Ownership Submission
FORM 5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Form 3 Holdings Reported
Form 4 Transactions Reported
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

ANNUAL STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person *
ISAAC ROBERT O
 2. Issuer Name and Ticker or Trading Symbol
ENSCO INTERNATIONAL INC [ESV] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Assistant Secretary
(Last)
(First)
(Middle)

500 N. AKARD STREET, SUITE 4300		 3. Statement for Issuer's Fiscal Year Ended (Month/Day/Year)
12/31/2006
(Street)


DALLAS, TX 75201-3331		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Reporting
(check applicable line)

_X_ Form Filed by One Reporting Person
___ Form Filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned at end of Issuer's Fiscal Year
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Amount (A) or (D) Price
Common Stock 12/31/2006(1)   A 20,617 (2) A $ 50.06 (3) 20,617 (4) D  
Common Stock 12/31/2006(1)   A 0.095 (5) A $ 31.32 (6) 91.638 (7) I ENSCO Savings Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 2270 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned at End of Issuer's Fiscal Year
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
(A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (Right to Buy) $ 31.765 12/31/2006(1)   J 2,500 (8)   06/03/2007(13) 06/03/2007 Common Stock
2,500 (8)
$ 31.765 2,500 (8)
D
 
Employee Stock Option (Right to Buy) $ 30.04 12/31/2006(1)   J 5,000 (9)   06/02/2007(13) 06/02/2008 Common Stock
5,000 (9)
$ 30.04 5,000 (9)
D
 
Employee Stock Option (Right to Buy) $ 27.315 12/31/2006(1)   J 12,000 (10)   08/17/2007(13) 08/17/2009 Common Stock
12,000 (10)
$ 27.315 12,000 (10)
D
 
Employee Stock Option (Right to Buy) $ 33.545 12/31/2006(1)   J 5,760 (11)   06/01/2007(13) 06/01/2012 Common Stock
5,760 (11)
$ 33.545 5,760 (11)
D
 
Employee Stock Option (Right to Buy) $ 50.28 12/31/2006(1)   J 6,000 (12)   06/01/2007(13) 06/01/2013 Common Stock
6,000 (12)
$ 50.28 6,000 (12)
D
 

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
ISAAC ROBERT O
500 N. AKARD STREET
SUITE 4300
DALLAS, TX 75201-3331		       Assistant Secretary  

Signatures

/s/ Robert O. Isaac 01/31/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Transaction date is issuer's fiscal year end of 12/31/06. All transactions accomplished during 2006 have been previously reported.
(2) Amount of securities beneficially owned is as of issuer's fiscal year end of 12/31/06.
(3) Price of securities is the trading price at close of business 12/29/06.
(4) Amount is representative of securities beneficially owned following all transactions accomplished during the issuer's fiscal year 2006. All previous dispositions of securities have been previously reported.
(5) Amount is representative of common stock acquired, and held indirectly, through normal payroll contributions to the ENSCO Savings Plan during the months of August through December 2006.
(6) Price of securities dependent upon trading price applicable on date of future transactions. The average cost/price is representative of all beneficially, indirectly owned securities acquired via normal payroll contributions to the ENSCO Savings Plan.
(7) Amount is representative of common stock acquired, and held indirectly, through normal payroll contributions to the ENSCO Savings Plan as of 12/31/06.
(8) Amount is representative of the balance of vested options out of an original total grant of 10,000 options. The options were vested and exercisable on issuer's fiscal year end of 12/31/06.
(9) Amount is representative of the balance of options out of an original total grant of 10,000 options. Of the 5,000 options, 2,500 options were vested and exercisable on issuer's fiscal year end of 12/31/06. The remaining unvested balance of 2,500 options will vest on June 2, 2007.
(10) Amount is representative of an original total grant, of which 6,000 options were vested and exercisable on issuer's fiscal year end of 12/31/06. The remaining unvested balance of 6,000 options will vest in increments of 3,000 each on August 17th 2007 and 2008.
(11) Amount is representative of an original total grant, of which 1,440 options were vested and exercisable on issuer's fiscal year end of 12/31/06. The remaining unvested balance of 4,320 options will vest in increments of 1,440 on each June 1st 2007, 2008 and 2009.
(12) Amount is representative of a total options grant, which will vest in increments of 1,500 each on June 1st 2007, 2008, 2009 and 2010. No options under this grant were vested and exercisable on issuer's fiscal year end of 12/31/06.
(13) Employee Stock Options vest at a rate of 25% per annum on the anniversary date of the grant.

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