German submarine U-427 was a Type VIIC U boat of the German Kriegsmarine during World War II. Built by Danziger Werft, Danzig, the U-boat was laid down on 27 July 1942, launched on 6 February 1943 and commissioned on 2 June 1943 with a crew of 53 under their Austrian commander Oberleutnant Graf Carl-Gabriel von Gudenus. It survived until the end of the war. Ironically, most U-boats achieved notoriety for the number of kills they achieved, or the total tonnage of the vessels they sank, but in the case of U-427 fame was achieved in a different way.