The Große Teufelsmühle is a natural monument on the Viktorshöhe near Friedrichsbrunn in the Harz Mountains of central Germany. The name means Great Devil's Mill. It is a tor, a granite rock formation that displays typical spheroidal or mattress weathering. The Große Teufelsmühle is a protected monument. Next to it is a checkpoint (no. 189) in the Harzer Wandernadel hiking system. In the vicinity is another rock formation, the Kleine Teufelsmühle.