German submarine U-551

German submarine U-551 was a Type VIIC U-boat of the Nazi German Kriegsmarine during World War II. The submarine was laid down on 21 November 1939 at the Blohm & Voss yard in Hamburg as 'werk' 527, launched on 14 September 1940, and commissioned on 7 November 1940 under the command of Kapitänleutnant Karl Schrott.

Service history
Attached to the 7th U-boat Flotilla, she first sailed from Kiel, Germany to Bergen, Norway, before commencing her first and only war patrol on 18 March 1941. She sailed to the waters south of Iceland, and there on 23 March, in position 62.61667°N, -16.78333°W, she was sunk by depth charges from the British anti-submarine warfare trawler HMT Visenda. All 45 hands were lost.