German submarine U-806

German submarine U-806 was a Type IXC/40 U-boat built for Nazi Germany's Kriegsmarine during World War II.

U-801 was ordered in April 1941 from DeSchiMAG Seebeckwerft in Geestemünde under the yard number 716. Her keel was laid down on 27 April 1943 and the U-boat was launched sometime late in 1943. On 29 April 1944 she was commissioned into service under the command of Kapitänleutnant Klaus Hornbostel (Crew 34) in the 4th U-boat Flotilla.

After work up for deployment in the Baltic Sea, U-806 transferred to the 33rd U-boat Flotilla for front-line service on 19 October 1944. She left Kiel for her first - and only - war patrol on 23 October. On the way to her assigned operational area off Canada she stopped at Horten and Kristiansand. While operating against convoy HX-327 in late December 1944, U-806 sank two ships, the British steamer SS Samtucky of, and the Canadian escort HMCS Clayoqout (J174) on 21 and 24 December respectively. An attack on another Canadian escort, HMCS Transcona (J271), failed.

Two months later, U-806 returned to base via Norway, arriving in Flensburg on 27 February 1945. Spending the rest of the war in training, U-806 ran aground on Hatter Reef on 5 May 1945 and had to be towed free by a tug the next day. She arrived in Aarhus later that day in order to surrender to the Allies.

In June 1945 the U-boat was transferred to Loch Ryan via Fredericia, Kiel, and Wilhelmshaven, arriving in Scotland on 26 June. On 20 December 1945, as part of Operation Deadlight, U-806 left Loch Ryan under tow from HMS Masterful to be sunk by ORP Błyskawica by artillery.