German submarine U-231 was a Type VIIC U-boat of the Nazi German Kriegsmarine during World War II. The submarine was laid down on 30 January 1942 at the Friedrich Krupp Germaniawerft yard at Kiel as 'werk' 661, launched on 1 October, and commissioned on 14 November under the command of Kapitänleutnant Wolfgang Wenzel. U-231 was sunk on 13 January 1944 in the North Atlantic northeast of the Azores by a British aircraft.