German submarine U-2343 was a Type XXIII U-boat of Nazi Germany's Kriegsmarine during World War II. She was ordered on 20 September 1943, and was laid down on 31 August 1944 at Deutsche Werft AG, Hamburg, as yard number 497. She was launched on 18 October 1944 and commissioned under the command of Oberleutnant zur See Harald Fuhlendorf on 6 November 1944.