HMS G13 was a British G-class submarine built for the Royal Navy during World War I.

[1] For surface running, the boats were powered by two 800-brake-horsepower (597 kW) Vickers two-stroke diesel engines, each driving one propeller shaft.

On the surface, the G class had a range of 2,400 nautical miles (4,400 km; 2,800 mi) at 14.25 knots (26.39 km/h; 16.40 mph).

[1] Like the rest of her class, G13's role was to patrol an area of the North Sea in search of German U-boats.

On 10 March 1917 G13 torpedoed and sank the German submarine UC-43 off the Shetland Islands, about 9 miles (14 km) NW of Muckle Flugga Lighthouse.