German submarine U-320 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine during World War II.
She carried out just two patrols, but did not sink any ships.
The boat was badly damaged on 8 May 1945 by a British aircraft and consequently scuttled by the crew in the North Sea; the last to be sunk by direct action.
German Type VIIC/41 submarines were preceded by the heavier Type VIIC submarines. U-320 had a displacement of 759t when at the surface and 860t 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-320 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), one 3.7cm (01.5inches) Flak M42 and two 2sp=usNaNsp=us C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.
The submarine was laid down on 1 December 1942 by the Flender Werke yard at Lübeck as yard number 320, launched on 6 November 1943 and commissioned on 30 December under the command of Oberleutnant zur See Siegfried Breinlinger.
She served with the 4th U-boat Flotilla for training, from 30 December 1943 to 1 April 1944 and the 5th flotilla for operations until her sinking on 8 May 1945.
U-320 departed Kiel on 16 April 1945 and arrived in Horten Naval Base (south of Oslo), on the 21st.
The boat left Horten on 27 April 1945. On 8 May she was badly damaged by depth charges dropped from a British Catalina of No. 210 Squadron RAF. The battered submarine managed to surface off the Norwegian coast, where she was scuttled.