Robbio is a city and comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 50 km southwest of Milan and about 45 km west of Pavia. It is part of Lomellina traditional region.Robbio borders the following municipalities: Borgolavezzaro, Castelnovetto, Confienza, Nicorvo, Palestro, Rosasco, Vespolate.