German submarine U-663

German submarine U-663 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 31 March 1941 by Deutsche Werft, Hamburg as yard number 812, launched on 26 March 1942 and commissioned on 14 May 1942 under Kapitänleutnant Heinrich Schmid.

Service History
The boat's career began with training at 5th U-boat Flotilla on 14 May 1942, followed by active service on 1 October 1942 as part of the 11th Flotilla. After only one month, she transferred to the 9th Flotilla on 1 November 1942, for the remainder of her service.

In 3 patrols she sank 2 merchant ships, for a total of.

Wolfpacks
U-663 took part in four wolfpacks, namely
 * Drachen (22 November – 3 December 1942)
 * Panzer (3–9 December 1942)
 * Büffel (9–14 December 1942)
 * Seeteufel (21–30 March 1943)

Fate
U-663 was sunk on 8 May 1943 in the Bay of Biscay in position 46.83333°N, -10°W, by depth charges from RAAF Sunderland. All hands were lost.