The Großkampfwagen or "K-Wagen" (short for G.K.-Wagen) was a German super-heavy tank, two prototypes of which were almost completed by the end of World War I.

On June 28, 1917 the War Ministry approved the draft design and ordered ten examples, five to be built by the Riebe ball-bearing factory in Berlin and five by Wegmann & Co. of Kassel.

Two prototypes were built at the request of Hindenburg, but were still incomplete by the end of the war due to lack of raw materials and other demands for weaponry.

The commander could give orders to the crew by means of electric lights: fire control was comparable to that of a destroyer, the Germans seeing the vehicle as a veritable "landship".

One of the tanks, "Ribe"[verification needed] was complete at the end of the war, but it never left the factory and was scrapped under the watchful eyes of the Military Inter-Allied Commission of Control.