|Ordered||14 Oct 1941|
|Laid down||21 Jan 1943||Flender Werke AG, Lübeck (werk 321)|
|Launched||27 Nov 1943|
|Commissioned||20 Jan 1944||Kptlt. Ulrich Drews|
|Successes||No ships sunk or damaged|
Sunk 2 April, 1945 south-west of Ireland, in position 50.00N, 12.57W, by depth charges from a Polish Wellington aircraft (Sqdn. 304/Y). 41 dead (all hands lost).
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-321 did not suffer any casualties (we know of) until the time of her loss.