UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                   FORM 12b-25

                           NOTIFICATION OF LATE FILING

                                                      SEC File Number 000-49604
                                                       CUSIP NUMBER 564563 10 4


        ManTech International Corporation Employee Stock Ownership Plan


(Check One): [_]Form 10-K [_]Form 20-F [X]Form 11-K [_]Form 10-Q [_]Form N-SAR


For Period Ended: December 31, 2002 and years ended December 30, 2002 and 2001

[_] 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:  N/A

                                     PART I
                             REGISTRANT INFORMATION

Full name of registrant:  ManTech International Corporation.

Former name if applicable: N/A

Address of principal executive office (Street and number): 12015 Lee Jackson
Highway

City, state and zip code: Fairfax, VA 22033





                                     PART II
                             RULE 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.) [X]

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

         (b)  The subject annual report, semi-annual report, transition
              report on Form 10-K, 20-F, 11-K or Form N-SAR, 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 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 the Form 10-K, 20-F, 11-K, 10-Q, N-SAR or
the transition report portion thereof could not be filed within the prescribed
time period. (Attach extra sheets if needed.)

The Company requires more time to complete financial information within the
prescribed time.

                                     PART IV
                                OTHER INFORMATION

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

                          Jodee L. Engle (703) 218-8224
                          (Name) (Area Code) (Telephone Number)

(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 the 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?
[_] Yes [X] 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.

                        ManTech International Corporation
                  (Name of Registrant as Specified in Charter)

Has caused this notification to be signed on its behalf by the undersigned
thereunto duly authorized.

Date: June 30, 2003 By: /s/       Matthew P. Galaski
                        --------------------------------------
                           Name:    Matthew P. Galaski
                           Title:   Vice President and Assistant Chief Financial
                                    Officer

                                    ATTENTION

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