Silo (died 783) is the king of Asturias from 774 to 783, succeeding Aurelius.

He comes to the throne upon his marriage to Adosinda, daughter of Alfonso I ("Alfonso the Catholic").

He moves the capital of the Kingdom of Asturias from Cangas de Onís to Pravia, closer to the center of the kingdom.

He is a contemporary of Abd al-Rahman I, Umayyad Emir of Córdoba, and of Charlemagne.