Montafia is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about southeast of Turin and about northwest of Asti. As of 31 January 2024, it had a population of 950 and an area of .
Montafia borders the following municipalities: Buttigliera d'Asti, Capriglio, Cortazzone, Piea, PiovÃÂ Massaia, Roatto, San Paolo Solbrito, Viale, and Villanova d'Asti.