German submarine U-3008 was a Type XXI U-boat of Nazi Germany's Kriegsmarine that served in the United States Navy for several years after World War II.

Her keel was laid down on 2 July 1944 by DeSchiMAG AG Weser of Bremen, and she was commissioned on 19 October 1944 with Kapitänleutnant Fokko Schlömer in command.

On 21 June 1945 U-3008 was part of a flotilla of six U-boats escorted by HMS Hargood from Wilhelmshaven to Lishally, Northern Ireland.

[4] On 13 September, she moved to the Portsmouth Navy Yard in Kittery, Maine, where she began an extensive overhaul the following day.

Work proceeded on an intermittent basis due to the lack of final and total approval of the vessel's allocation to the United States by the Allied powers concerned.

However, by the spring of 1946, the naval shipyard received orders to proceed with the overhaul as expeditiously as possible and to place the submarine in service immediately upon its completion.

U-3008's overhaul was completed by mid-summer, and she was placed into active U.S. Navy service on 24 July 1946 with Commander Everett H. Steinmetz in charge.