Garbagna is a comune (municipality) in the Province of Alessandria, in the Italian region of Piedmont. It is located about 110 kilometres (68 mi) southeast of Turin and about 35 kilometres (22 mi) southeast of Alessandria.
As a comune, Garbagna is the basic administrative unit of local government in Italy, encompassing the town itself and its surrounding territory within the Province of Alessandria. Its position in southeastern Piedmont places it in the part of the region that borders Liguria.