German submarine U-3507 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 19 July 1944 at F Schichau GmbH, Danzig, as yard number 1652. She was launched on 16 September 1944, and commissioned under the command of Oberleutnant zur See Otto Niethmann on 19 October 1944.
Like all Type XXI U-boats, U-3507 had a displacement of when at the surface and while submerged. She had a total length of (o/a), a beam of , and a draught of . The submarine was powered by two MAN SE supercharged six-cylinder M6V40/46KBB diesel engines each providing , two Siemens-Schuckert GU365/30 double-acting electric motors each providing , and two Siemens-Schuckert silent running GV232/28 electric motors each providing .
The submarine had a maximum surface speed of and a submerged speed of . When running on silent motors the boat could operate at a speed of . When submerged, the boat could operate at for ; when surfaced, she could travel at . U-3507 was fitted with six torpedo tubes in the bow and four C/30 anti-aircraft guns. She could carry twenty-three torpedoes or seventeen torpedoes and twelve mines. The complement was five officers and fifty-two men.
U-3507 was scuttled on 3 May 1945, at Travemünde, as part of Operation Regenbogen. The wreck was later raised and broken up.