German submarine U-3508 was a Type XXI U-boat of Nazi Germany's Kriegsmarine during World War II.

The Elektroboote submarine was laid down on 25 July 1944 at the Schichau-Werke yard at Danzig, launched on 22 September 1944, and commissioned on 2 November 1944 under the command of Oberleutnant zur See Detlef von Lehsten.

[3] The submarine was powered by two MAN SE supercharged six-cylinder M6V40/46KBB diesel engines each providing 4,000 metric horsepower (2,900 kilowatts; 3,900 shaft horsepower), two Siemens-Schuckert GU365/30 double-acting electric motors each providing 5,000 PS (3,700 kW; 4,900 shp), and two Siemens-Schuckert silent running GV232/28 electric motors each providing 226 PS (166 kW; 223 shp).

When running on silent motors the boat could operate at a speed of 6.1 knots (11.3 km/h; 7.0 mph).

[3] She was sunk on 4 March 1945 in an Allied bombing raid by US Eighth Air Force B-24 Liberator bombers on Wilhelmshaven.