German submarine U-443 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II.
She was laid down at Schichau-Werke, Danzig, on 10 February 1941, launched on 31 January 1942 and commissioned on 18 April with Oberleutnant zur See Konstantin von Puttkamer in command. She served with the 8th U-boat Flotilla for training, then with the 9th flotilla from 1 October 1942 until 31 December 1942, and the 29th flotilla from 1 January 1943 until 23 February for operations.
U-443 completed three patrols, sinking three merchant ships totalling and one warship of .
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-443 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 AEG GU 460/8–27 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-443 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.
U-443 began her operational service when she departed Kiel on 1 October 1942 and sailed out into the Atlantic, clearing the northern coast of Scotland. On 9 October in rough weather, a lookout broke his arm. The U-boat sank two ships from Convoy ON 139 in mid-Atlantic on 22 October, but was then forced to submerge where she was held by the escort ships until the convoy had escaped. She subsequently steamed into Brest in occupied France, arriving on 4 November.
Her second sortie saw her leave Brest on 29 November 1942, penetrate the heavily defended Strait of Gibraltar, sink two more ships in the western Mediterranean and arrive at the Italian port of La Spezia on 22 December.
The U-boat left La Spezia on 16 February 1943 and headed southwest. She was sunk with all hands on 23 February northwest of Algiers by depth charges from the escort destroyers, and .
U-443 took part in two wolfpacks, namely:
| Date | Ship Name | Nationality | Tonnage[1] | Fate[2] | |
|---|---|---|---|---|---|
| 22 October 1942 | Donax |  United Kingdom | 8,036 | Sunk | |
| 22 October 1942 | Winnipeg II | United Kingdom | 9,807 | Sunk | |
| 11 December 1942 | 1,087 | Sunk | |||
| 14 December 1942 | Edencrag | United Kingdom | 1,592 | Sunk |