German submarine U-1227 was a Type IXC/40 U-boat of the German Kriegsmarine during World War II. The submarine was laid down on 1 February 1942 at the Deutsche Werft yard at Hamburg, launched on 18 September 1943, and commissioned on 8 December 1943 under the command of Oberleutnant zur See Friedrich Altmeier. The U-boat then served with 31st U-boat Flotilla, a training unit, with 2nd U-boat flotilla from 1 August 1944 to 31 December 1944, and with 33rd U-boat Flotilla from 1 January 1945 to 10 April 1945.