|Ordered||20 Jan 1941|
|Laid down||26 Aug 1942||Howaldtswerke AG, Kiel (werk 30)|
|Launched||6 Nov 1943|
|Commissioned||18 Dec 1943||Korvkpt. Johann Reckhoff|
|Successes||No ships sunk or damaged|
Missing since 17 April 1945 in the North Sea or North Atlantic. No explanation exists for its loss. 43 dead (all hands lost).
U-398 was ordered to operate west of the English Channel and was not seen or heard of after sailing from Kristiansand in the evening of 17 April 1945. It was posted as missing after failing to return to port or signal its position after the cessation of hostilities.
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-398 did not suffer any casualties (we know of) until the time of her loss.
U-boats Missing in Action.