Drygarn Fawr is a mountain in the county of Powys, Wales. It is one of the highest summits in Mid Wales standing at 645 metres or 2114 feet above sea level. It lies to the south of the Elan Valley Reservoirs. Rising above the remote moorland plateau of the Cambrian Mountains, and to the west of the peaks of Radnor Forest, the summit is topped by two distinctive, large cairns. The mountain has a gentle, grassy, conical shape with a few rocks near the summit. Nearby are the summits of Gorllwyn and Y Gamriw, both over 600m.