German submarine U-407 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine during World War II.

The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two Siemens-Schuckert GU 343/38–8 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged.

[2] When submerged, the boat could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph).

However, within 3 months, she transferred for operations in the Mediterranean with 29th Flotilla for the remainder of her service.

In twelve patrols she sank three merchant ships – including the 19,627 GRT RMS Viceroy of India on 11 November 1942 – for a total of 26,892 gross register tons (GRT), one merchant ship damaged of 6,207 GRT, two warships damaged (17,900 tons) and one more ship a total loss 7,176 GRT; however, some sources claim that the damaging of HMS Newfoundland is to be attributed to the Italian submarine Ascianghi.