Mount Sumbing () is an active stratovolcano in Central Java, Indonesia. This volcano is symmetrical like its neighbor Mount Sindoro which lies to its northwest. Administratively, The volcano is divided between 3 regencies: Temanggung, Wonosobo, and Magelang. The only report of historical eruptions is from 1730. It has created a small phreatic crater at the summit.
The summit of Mount Sumbing serves as the meeting point of the borders of three river basins, namely, the on the eastern side of the mountain, the , and the on the western side of the mountain. The Progo River Basin covers more than 50% of the Mount Sumbing complex. Each of these river basins flows towards the , eventually emptying into the Indian Ocean.