German submarine U-756 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. Laid down as yard number 139 at the Kriegsmarinewerft (KMW) in Wilhelmshaven, she served with 6th U-boat flotilla from 30 December 1941 until 1 September 1942 under the command of Kapitänleutnant Klaus Harney. U-756 did not survive to complete her first patrol and did not sink or damage any ships.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-756 had a displacement of 769t when at the surface and 871t while submerged. She had a total length of 67.1m (220.1feet), a pressure hull length of 50.5m (165.7feet), a beam of 6.2m (20.3feet), a height of 9.6m (31.5feet), and a draught of 4.74m (15.55feet). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of NaNPS for use while surfaced, two Garbe, Lahmeyer & Co. RP 137/c double-acting electric motors producing a total of 750PS for use while submerged. She had two shafts and two 1.23abbr=onNaNabbr=on propellers. The boat was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . U-756 was fitted with five 53.30NaN0 torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.82NaN2 SK C/35 naval gun, 220 rounds, and a 2sp=usNaNsp=us C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.
Eighteen days into her first patrol,[1] on 1 September 1942 U-756 was in position 58.1333°N -60°W in the mid North-Atlantic[2] when she was attacked by the Canadian corvette . Heavily damaged, the vessel went down with all 43 aboard.