UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 12b-25

                           NOTIFICATION OF LATE FILING



 (Check One): [X]  Form 10-K  Form 20-F   Form 11-K   Form 10-Q   Form 10-D
Form N-SAR    Form N-CSR
                       For Period Ended: December 31, 2005
                   -------------------------------------------

                     Transition Report on Form 10-K
                     Transition Report on Form 20-F
                     Transition Report on Form 11-K
                     Transition Report on Form 10-Q
                     Transition Report on Form N-SAR

                        For the Transition Period Ended:
                          ----------------------------

Nothing in this form shall be construed to imply that the Commission has
verified any information contained herein.

If the notification relates to a portion of the filing checked above, identify
the item(s) to which the notification relates:

PART I - REGISTRANT INFORMATION

Anteon International Corporation
Full Name of Registrant


Former Name if Applicable

3211 Jermantown Road,
- --------------------------------------------------------------------------------
Address of Principal Executive Office (Street and Number)

Fairfax, VA 22030
City, State and Zip Code

PART II - RULES 12b-25(b) AND (c)

If the subject report could not be filed without unreasonable effort or expense
and the registrant seeks relief pursuant to Rule 12b-25(b), the following should
be completed. (Check box if appropriate)

          (a)  The reasons  described in  reasonable  detail in Part III of this
               form  could  not be  eliminated  without  unreasonable  effort or
               expense;

[X]       (b)  The subject annual report,  semi-annual report, transition report
               on Form 10-K,  Form 20-F, Form 11-K, Form N-SAR or Form N-CSR, or
               portion thereof, will be filed on or before the 15th calendar day
               following  the  prescribed  due date;  or the  subject  quarterly
               report or transition report on Form 10-Q or subject  distribution
               report on Form  10-D,  or  portion  thereof,  will be filed on or
               before the fifth  calendar day following the prescribed due date;
               and

          (c)  The  accountant's  statement  or other  exhibit  required by Rule
               12b-25(c) has been attached if applicable.


PART III - NARRATIVE

State below in reasonable  detail why Forms 10-K, 20-F, 11-K, 10-Q, 10-D, N-SAR,
N-CSR or the transition report or portion thereof, could not be filed within the
prescribed time period. (Attach Extra Sheets if Needed)

The  annual  report  on Form  10-K (the  "Form  10-K")  of Anteon  International
Corporation  (the "Company") for the annual period ended December 31, 2005 could
not be filed within the  prescribed  time period due to technical  difficulties.
The Company  transmitted  its Form 10-K on March 16,  2006,  after the 5:30 p.m.
Eastern Time deadline.

PART IV - OTHER INFORMATION

(1) Name and telephone number of person to contact in regard to this
notification.


 Vincent J. Kiernan,                 703                    246-0200
 -------------------                 ----                   --------
                                 (Area Code)            Telephone Number)
 Senior Vice President
  of Finance
    (Name)

(2)  Have all other periodic  reports  required under Section 13 or 15(d) of the
     Securities Exchange Act of 1934 or Section 30 of the Investment Company Act
     of 1940 during the preceding 12 months or for such shorter  period that the
     registrant was required to file such report(s) been filed? If answer is no,
     identify report(s).

            X  Yes       No

(3)      Is it anticipated that any significant change in results of operations
         from the corresponding period for the last fiscal year will be
         reflected by the earnings statements to be included in the subject
         report or portion thereof?

          X  Yes      No

          If  so,  attach  an  explanation  of  the  anticipated   change,  both
          narratively and quantitatively, and, if appropriate, state the reasons
          why a reasonable estimate of the results cannot be made.

          The results of operations for the fiscal year ending December 31, 2005
          are included in the Company's 10-K filed as of the date hereof.




                        Anteon International Corporation
                        ---------------------------------
                  (Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned
hereunto duly authorized.

Date     March 16, 2006         By       /s/ Vincent J. Kiernan
     ----------------------         ----------------------------------------
                                         Name:    Vincent J. Kiernan
                                         Title:   Senior Vice President
                                                  of Finance


INSTRUCTION: The form may be signed by an executive officer of the registrant or
by any other duly  authorized  representative.  The name and title of the person
signing  the form  shall  be typed or  printed  beneath  the  signature.  If the
statement is signed on behalf of the registrant by an authorized  representative
(other than an executive officer), evidence of the representative's authority to
sign on behalf of the registrant shall be filed with the form.

                                    ATTENTION

Intentional  misstatements  or omissions  of fact  constitute  Federal  Criminal
Violations (See 18 U.S.C. 1001).