Terzo, Piedmont

Terzo is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 70 km southeast of Turin and about 30 km southwest of Alessandria.

It was a fortress of the bishop of Acqui, of which only a late medieval tower remains. Terzo borders the following municipalities: Acqui Terme, Bistagno, Melazzo, and Montabone.