Torrazza Coste is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about south of Milan and about southwest of Pavia. As of 31 December 2004, it had a population of 1,516 and an area of .
Torrazza Coste borders the following municipalities: Borgo Priolo, Codevilla, Montebello della Battaglia, Retorbido, Rocca Susella.