Soglio is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about east of Turin and about northwest of Asti. As of 31 December 2004, it had a population of 129 and an area of .
Soglio borders the following municipalities: Camerano Casasco, Cortanze, Cortazzone, Montechiaro d'Asti, Piea, and Viale.