Cathedral Mountain is a dominant mountain in the Cradle Mountain-Lake St Clair National Park in the central highlands in the state of Tasmania, Australia. Cathedral Mountain has an altitude of 1387 metres. The western side of this mountain has a spectacular and extensive cliff face which plunges some 700 metres to the Mersey Valley floor.
Due west from Cathedral lies Mount Ossa, Tasmania's highest mountain, due north is Mount Pillinger, due east is Mount Ragoona and due south is Castle Crag in the Du Cane Range. Directly beneath the cliff faces of Cathedral Mountain runs the upper reaches of the Mersey River (Tasmania). The Overland Track passes within two kilometres of the southern side of this mountain. Most features in the general area of Cathedral Mountain have church-based names. These include; Chalice Lake, Chapter Lake, Cloister Lagoon, Convent Hill, Bishop Peak, Curate Bluff, Vicar Bluff and Dean Bluff.