Großer Kalmberg, Mountain summit in Ilm-Saale-Platte, Thuringia, Germany

Großer Kalmberg is a 547.5-meter-high mountain in the Ilm-Saale-Platte, a Muschelkalk limestone plateau, making it the highest elevation of that plateau apart from the Singener Berg. It lies on the border between the Ilm-Kreis and the Landkreis Saalfeld-Rudolstadt, with its western part belonging to Stadtilm and its eastern part to Rudolstadt. The mountain is covered with pines; its southern side drops steeply to the Remdaer Graben, while the northern side slopes gently toward the Ilm valley.

The hill served as a military helicopter landing site during the German Democratic Republic period operated by the National People's Army's anti-aircraft division. This military use shaped the area's history during the Cold War era.

The summit sits on the border between the Ilm-Kreis and the Saalfeld-Rudolstadt district: the western part belongs to Stadtilm, the eastern part to Rudolstadt. Villages such as Dienstedt, Kleinhettstedt and Oesteröda lie to the north, Döllstedt, Nahwinden and Ehrenstein to the southwest, and Altremda, Remda and Breitenheerda to the east.

Multiple marked hiking trails lead from the nearby town of Stadtilm to the summit with varying difficulty levels. The paths are clearly signposted allowing visitors of different fitness levels to choose routes that suit their abilities.

On the summit stands a 169-metre transmission mast of the Remda transmitter, built on part of the former NVA site after 1990. The southern slope was designated an FFH protected area in 1999, covering 264 hectares of dry limestone grassland, rock ledges and small fen biotopes.