Deogyusan, formerly spelled Togyusan, is a mountain in South Korea. Its highest peak is 1,614 meters above sea level.
Deogyusan stands on the border of Jeollabuk-do and Gyeongsangnam-do, covering portions of Muju and Jangsu Counties in Jeollabuk-do and Geochang and Hamyang Counties in Gyeongsangnam-do.
Deogyusan stands on the Baekdudaegan, the mountainous spine of the Korean Peninsula. It is composed of numerous ridges which rise to various local peaks; the highest (by which the mountain's elevation is measured) is Hyangjeokbong.Deogyusan is the cornerstone of Deogyusan National Park, established 1975. The attractions of the park include the Chiryeon Waterfall and Cheoksan mountain fortress. It is also famous for the winter ski resort of Muju.