Carpeneto is a comune (municipality) in the Province of Alessandria in the Italian region of Piedmont. It is located about 80 km southeast of Turin, and about 25 km south of Alessandria. Carpeneto borders the following municipalities: Montaldo Bormida, Predosa, Rocca Grimalda, Sezzadio, and Trisobbio. The Baroque church of San Giorgio serves as the main Roman Catholic parish for the comune.