German submarine U-843 was a Type IXC/40 U-boat of the German Kriegsmarine during World War II. The submarine was laid down on 21 April 1942 at the AG Weser yard in Bremen, launched on 15 December 1942, and commissioned on 24 March 1943 under the command of Kapitänleutnant Oskar Herwartz. After training with 4th U-boat Flotilla in the Baltic Sea, U-843 was transferred to 2nd U-boat Flotilla on 1 November 1943 for front-line service, and was transferred to 33rd U-boat Flotilla on 1 October 1944. She carried out three war patrols, sinking one ship, and was sunk by a British aircraft in April 1945. In 1958 the wreck was raised, and then broken up at Gothenburg.