Exhibit 23.3


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


We consent to the reference to our firm under the caption "Experts" and to the
use of our report dated March 29, 2002, with respect to the financial
statements of Aegis Research Corporation for the year ended December 31, 2001
included in the Registration Statement Form S-1 of ManTech International
Corporation for the registration of 6,150,000 shares of its Class A common
stock.



/s/ Ernst & Young

McLean, Virginia
November 7, 2002