The Belbo is a 95 km long river of southern Piedmont, Italy. It is a right-side tributary of the Tanaro.
The Belbo rises in the Langhe, on the borders between Piedmont and Liguria in the hills of Montezemolo. After flowing through the Piedmontese provinces of Cuneo, Asti and Alessandria, the river joins the Tanaro from the right at Villa del Foro, in the comune of Alessandria.
