German submarine U-47 was a Type VIIB U-boat of Nazi Germany's Kriegsmarine during World War II. She was laid down on 25 February 1937 at Friedrich Krupp Germaniawerft in Kiel as yard number 582 and went into service on 17 December 1938 under the command of Günther Prien.
During U-47's career, she sank a total of 31 enemy vessels, including the British battleship HMS Royal Oak, and damaged nine more. U-47 was the thirteenth most successful U-boat of World War II based on tonnage of enemy shipping sunk.
U-47 disappeared in March 1941, and the 45 crewmembers are presumed to have died. Her fate remains unknown.
