German submarine U-1171 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine during World War II. She was ordered on 16 July 1942, and was laid down on 5 May 1943, at Danziger Werft AG, Danzig, as yard number 143. She was launched on 23 November 1943, and commissioned under the command of Oberleutnant zur See Otto Heinrich Nachtigall on 22 March 1944.