Murialdo (; ) is a comune (municipality) in the Province of Savona in the Italian region Liguria, located about west of Genoa and about west of Savona. As of 31 December 2004, it had a population of 882 and an area of .
The municipality of Murialdo contains the "Borgate" (subdivisions, mainly villages and hamlets): Piani, Piavata, Piano, Ponte, Bonetti, Valle, Isolagrande and Riofreddo.
Murialdo borders the following municipalities: Calizzano, Castelnuovo di Ceva, Massimino, Millesimo, Osiglia, Perlo, Priero, and Roccavignale.
Murialdo is twinned with: