German submarine U-633

German submarine U-633 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 22 September 1941 by Blohm & Voss, Hamburg as yard number 609, launched on 10 June 1942 and commissioned on 30 July 1942 under Oberleutnant zur See Bernhard Müller.

Service History
The boat's career began with training at 5th U-boat Flotilla on 30 July 1942, followed by active service on 1 March 1943 as part of the 9th Flotilla for the remainder of her short service.

In one patrol she sank one merchant ship, for a total of.

Wolfpacks
U-633 took part in two wolfpacks, namely
 * Neuland (4–6 March 1943)
 * Ostmark (6–10 March 1943)

Fate
U-633 was sunk on 10 March 1943 in the North Atlantic in position 58.85°N, -19.91667°W, after being rammed by British freighter SS Scorton. All 43 hands were lost.