<Page> Exhibit 23.1 CONSENT OF INDEPENDENT AUDITORS We consent to the reference to our firm under the caption "Experts" and to the use of our reports on the consolidated financial statements and schedule of DigitalNet Holdings, Inc. dated January 27, 2003 (except with respect to the matter discussed in paragraph 6 in Note 1, as to which the date is March 28, 2003) and to our reports on the consolidated financial statements and schedule of DigitalNet Goverment Solutions, LLC dated January 27, 2003 in Amendment No. 5 to the registration statement (Form S-1 No. 333-107764) and related prospectus of DigitalNet Holdings, Inc. for the registration of shares of its common stock. /s/ Ernst and Young LLP McLean, Virginia October 8, 2003