German submarine U-1131 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.
She was ordered on 25 August 1941, and was laid down on 6 February 1943 at Howaldtswerke AG, Kiel, as yard number 33. She was launched on 3 April 1944 and commissioned under the command of Oberleutnant zur See Günther Fiebig on 20 May 1944.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-1131 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 Garbe, Lahmeyer & Co. RP 137/c 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-1131 was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes or 26 TMA mines, one SK C/35 naval gun, (220 rounds), one Flak M42 and two twin C/30 anti-aircraft guns. The boat had a complement of between 44 â 52 men.
On 30 March 1945, U-1131 was sunk by bombs while inside a pontoon dock southeast of the U-boat bunker Fink II at Hamburg-Finkenwerder. U-1131 was caught in a US 8th Air Force raid. The wreck was later broken up.
The wreck was located at .