Somiedo (Asturian: Somiedu) is a municipality in the Autonomous Community of the Principality of Asturias, Spain. It is bordered on the north by Belmonte de Miranda, on the east by Teverga, on the west by Tineo and Cangas del Narcea, and on the south by the province of León.

It is the second least densely populated municipality in Asturias.

All of the municipality forms part of Somiedo Natural Park, which has been declared a biosphere reserve by Unesco. Saliencia Lakes are located in Somiedo.