German submarine U-669

German submarine U-669 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 3 November 1941 at the Howaldtswerke yard at Hamburg, launched on 5 October 1942, and commissioned on 16 December 1942 under the command of Oberleutnant zur See d.R. Kurt Köhl.

Attached to 5th U-boat Flotilla based at Kiel, U-669 completed her training period on 31 May 1943 and was assigned to front-line service.

Service history
On the second war patrol U-669 went missing in the Bay of Biscay in August 1943. The U-boat had left St. Nazaire on 29 August and had not been heard of since. Subsequently U-669 and her crew of 52 was declared missing on 8 September 1943.