German submarine U-957 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.
Laid down by Blohm & Voss, Hamburg on 11 March 1942, the U-boat was launched on 21 November 1942, and commissioned on 7 January 1943, by Oberleutnant zur See Franz Saar.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-957 had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced, two Brown, Boveri & Cie GG UB 720/8 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . U-957 was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one SK C/35 naval gun, 220 rounds, and one twin C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.
Under the command of Oberleutnant zur See Gerhard Schaar U-957 carried out seven war patrols between December 1943 and October 1944, sinking two commercial vessels; the British Fort Bellingham and the Soviet survey vessel Nord; and two military vessels, the American submarine chaser , and the Soviet corvette Brilliant.
Her combat career ended on 19 October 1944 at Lofoten, Norway, when she collided with a German steamer. On 21 October 1944 she was taken out of service in Trondheim.
In May 1945, she was probably scuttled in the Skjömenfjord.