German submarine U-107 was a Type IXB U-boat of Nazi Germany's Kriegsmarine that operated during World War II.

The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of 4,400 metric horsepower (3,240 kW; 4,340 shp) for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of 1,000 metric horsepower (740 kW; 990 shp) for use while submerged.

[2] When submerged, the boat could operate for 64 nautical miles (119 km; 74 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 12,000 nautical miles (22,000 km; 14,000 mi) at 10 knots (19 km/h; 12 mph).

[2] On 16 August 1944, U-107 departed from Lorient on a transport run to La Pallice.

[3] She was intercepted on 18 August in the Bay of Biscay, west of La Rochelle, in position 46°46′N 03°49′W / 46.767°N 3.817°W / 46.767; -3.817, by Allied forces, and was sunk by depth charges from a Short Sunderland (serialEJ150) of No.