|Ordered||14 Oct 1941|
|Laid down||4 Feb 1943||Danziger Werft AG, Danzig (werk 138)|
|Launched||28 Aug 1943|
|Commissioned||8 Dec 1943||Oblt. Herbert Wagner|
|Successes||No ships sunk or damaged|
Decommissioned on 28 August 1944 at Kiel, after being badly damaged by a torpedo explosion in Eckernförde on 28 July 1944. Hulk used as floating power station.
Scuttled on 3 May 1945 off dry dock No.2 at the Deutsche Werke shipyard in Kiel. Wreck broken up.
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-1166 did not suffer any casualties (we know of) until the time of her loss.