SM U-75 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-75 was engaged in naval warfare and took part in the First Battle of the Atlantic.

On her first mission, U-75 laid the mine that sank the cruiser HMS Hampshire during her voyage to Russia carrying British Secretary of State for War Lord Kitchener.

The cruiser sank at 59°07′N 03°24′W / 59.117°N 3.400°W / 59.117; -3.400 west of the Orkney Islands with nearly total loss of life in a force 9 gale.

The submarine was powered by two 900 metric horsepower (660 kW; 890 shp) engines for use while surfaced, and two 800 metric horsepower (590 kW; 790 shp) engines for use while submerged.

[2] When submerged, she could operate for 83 nautical miles (154 km; 96 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 7,880 nautical miles (14,590 km; 9,070 mi) at 7 knots (13 km/h; 8.1 mph).