German submarine U-665

German submarine U-665 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 10 June 1941 by Deutsche Werft, Hamburg as yard number 814, launched on 9 June 1942 and commissioned on 22 July 1942 under Leutnant zur See Hans-Jürgen Haupt.

Service History
The boat's career began with training at 5th U-boat Flotilla on 22 July 1942, followed by active service on 1 February 1943 as part of the 1st Flotilla for the remainder of her short service. In her sole patrol she sank one merchant ship, for a total of.

Wolfpacks
U-665 took part in three wolfpacks, namely
 * Neuland (4-6 March 1943)
 * Ostmark (6-11 March 1943)
 * Stürmer (11-20 March 1943)

Fate
U-665 was sunk on 22 March 1943 in the North Atlantic at 48.06667°N, -10.43333°W, by depth charges from an Armstrong Whitworth Whitley VII of No.10 Operational Training Unit RAF (10 OTU) (call-sign Q), for the loss of all hands.