U-634
| Type | VIIC |
| Laid down | 23 Sep 1941, Blohm & Voss, Hamburg |
| Commissioned | 6 Aug 1942, Oblt. Hans-Günther Brosin |
| Commanders | 08.42–01.43: Oblt. Hans-Günther Brosin 02.43–08.43: Oblt. Eberhard Dahlhaus |
| Career | 3 patrols 6 Aug 1942–31 Jan 1943: 5. Flottille (training) 1 Feb 1943–30 Aug 1943: 9. Flottille (front boat) |
| Successes | 1 ship sunk for a total of 7,176 tons |
| Fate | Sunk 30 Aug 1943 in the North Atlantic east of the Azores, in position 40.13N, 19.24W, by depth charges from the British sloop HMS Stork and the corvette Stonecrop. 47 dead (all hands lost). |
| Men lost | 10 Mar 1943: Bootsmaat Ernst Adam, lost overboard. |
| Successes against aircraft | 13 Jun 1943: British Sunderland aircraft, Squadron 228/U. |
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