German submarine U-243
 German submarine U-243 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.An order was placed for U-243 on 10 April 1941 and construction began on 28 October 1942 at Germaniawerft Kiel as 'werk' 677. She was launched the following year on 2 September 1943 and commissioned on 2 October under the command of Oberleutnant zur See Hans Märtens.Three days into her only patrol she shot a German aircraft down.She was sunk in the Bay of Biscay in July 1944