German submarine U-667 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service 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).

In five patrols she sank one merchant ship, for a total of 7,176 gross register tons (GRT) and 2 warships.

U-667 took part in five wolfpacks, namely: U-667 sunk on 26 August 1944 in the Bay of Biscay in position 46°04′N 01°03′W / 46.067°N 1.050°W / 46.067; -1.050, when she struck a mine.