Montabone is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about southeast of Turin and about southeast of Asti. As of 31 December 2004, it had a population of 357 and an area of .
Montabone borders the following municipalities: Acqui Terme, Bistagno, Castel Boglione, Castel Rocchero, Rocchetta Palafea, and Terzo.