Rialto () is a comune (municipality) in the Province of Savona in the Italian region Liguria, located about southwest of Genoa and about southwest of Savona. As of 31 December 2004, it had a population of 570 and an area of .
Rialto borders the following municipalities: Bormida, Calice Ligure, Calizzano, Magliolo, Osiglia, and Tovo San Giacomo.
Rialto is twinned with: