German submarine U-634

German submarine U-634 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 23 September 1941 by Blohm & Voss, Hamburg as yard number 610, launched on 10 June 1942 and commissioned on 6 August 1942 under Oberleutnant zur See Hans-Günther Brosin.

Service History
The boat's career began with training at 5th U-boat Flotilla on 6 August 1942, followed by active service on 1 February 1943 as part of the 9th Flotilla for the remainder of her service.

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

Wolfpacks
U-634 took part in five wolfpacks, namely
 * Westmark (6-11 March 1943)
 * Amsel (22 April - 3 May 1943)
 * Amsel 2 (3-6 May 1943)
 * Elbe (7-10 May 1943)
 * Elbe 1 (10-14 May 1943)

Fate
U-634 was sunk on 30 August 1943 in the North Atlantic in position 40.21667°N, -19.4°W, by depth charges from HMS Stork (L81) and HMS Stonecrop (K142). All hands were lost.