German submarine U-240

German submarine U-240 was a Type VIIC U-boat of the Nazi German Kriegsmarine during World War II. The submarine was laid down on 14 May 1942 at the Friedrich Krupp Germaniawerft yard at Kiel as 'werk' 670, launched on 18 February 1943 and commissioned on 3 April 1943 under the command of Oberleutnant zur See Günther Link.

Service history
After training with the 5th U-boat Flotilla at Kiel, U-240 was transferred to the 9th U-boat Flotilla for front-line service on 1 February 1944.

She sailed from Kiel to Kristiansand in Norway, on 27–28 March 1944, departing from there on her first combat patrol on 13 May.

The U-boat was listed as missing in the North Sea west of Norway from 17 May 1944. No explanation exists for her loss.

Previously recorded fate
U-240 was originally thought to have been sunk west of Norway by depth charges dropped by a Norwegian Short Sunderland flying boat of No. 330 Squadron RAF. The attack was against U-668. No damage was caused.