German submarine U-3514 was a Type XXI U-boat (one of the "Elektroboote") of Nazi Germany's Kriegsmarine, built for service in World War II.

She was ordered on 6 November 1943, and was laid down on 21 August 1944 at F Schichau GmbH, Danzig, as yard number 1659.

She was launched on 21 October 1944, and commissioned under the command of Oberleutnant zur See Günther Fritze on 9 December 1944.

[4] 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).

She was being held up in reserve just in case one of the Type XXI that had been transferred to the Soviets after the war did not arrive intact.