German submarine U-2356 was a Type XXIII U-boat of Nazi Germany's Kriegsmarine during World War II. She was ordered on 20 September 1944, and was laid down on 21 October 1944 at Deutsche Werft AG, Hamburg, as yard number 510. She was launched on 19 December 1944 and commissioned under the command of Oberleutnant zur See Friedrich Hartel on 12 January 1945.[2]