German submarine U-683

German submarine U-683 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 23 December 1942 at the Howaldtswerke yard at Hamburg, launched on 7 March 1944, and commissioned on 30 May 1944 under the command of Oberleutnant zur See Günter Keller.

Attached to 31st U-boat Flotilla based at Wesermünde, U-683 completed her training period on 31 December 1944 and was assigned to front-line service.

Service history
On the first and final war patrol, U-683 was last heard from on 20 February 1945 en-route to the assigned patrol area off Cherbourg. The U-boat was declared missing on 3 April 1945.