The Maschinengewehr 18 Tank und Flieger or MG 18 TuF, is a German dual-purpose heavy machine gun that was designed to fill both anti-tank and anti-aircraft roles.

Developed at the end of the First World War, it fired the same 13.25 × 92mm SR or tankpatrone 18 armor-piercing round later used by the Mauser 1918 T-Gewehr anti-tank rifle.

In October 1917, the Gewehr Prüfungs Kommission (GPK), on behalf of the Ministry of War, announced a six company competition for the construction of an automatic weapon capable of firing the new 13.25 × 92mm SR ammunition designed by the Polte cartridge factory in Magdeburg.

Besides the end of the war, there were other factors which limited the number of MG 18s produced, such as lack of production capacity, cost, complexity, weight and poor mobility.

The collapse of the German Empire and the prohibition of design and production of weapons imposed by the Versailles Treaty stopped any further development of the MG 18.