The Leichter Kampfwagen () or "LK I" was a German light tank prototype of the First World War. Designed to be a cheap light tank as opposed to the expensive heavies coming into service at the time, the tank only reached the prototype stage before the end of the war.
The LK I was designed by Joseph Vollmer. It was based on a Daimler car chassis, with the sprocket and idler wheels mounted to the existing axles, and, like a car, had the engine in front. The LK I was the first German tank to have a turret, with it being mounted at the rear of the vehicle and armed with a 7.92 mm MG08 machine gun. Armor ranged from 8mm to 14mm thick and it was powered by a 4-cylinder Daimler-Benz Otto Model 1910 engine which gave it a top speed of 14 km/h and a range of 70km.
Only two prototypes were produced in mid 1918, but no vehicles were ordered. Designed as an experimental cavalry tank, it paved the way to the LK II.