SM U-80 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-80 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

U-80 is credited for sinking the Laurentic, the 24th largest ship sunk in World War I by U-boats, at 14,892 GRT.

[7] U-80 was surrendered to the Allies at Harwich on 16 January 1919 in accordance with the requirements of the Armistice with Germany.

She was sold by the British Admiralty to George Cohen on 3 March 1919 for £2,300 (excluding engines), and was broken up at Swansea.

[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).