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 the Lomellina traditional region. Robbio borders the following municipalities: Borgolavezzaro, Castelnovetto, Confienza, Nicorvo, Palestro, Rosasco, Vespolate.

The area of Robbio has been settled since Neolithic times. A Roman centre named Redobium is attested by Pliny the Elder. Later it was a Lombard town and, later, a possession of the Catholic diocese of Vercelli. Around the 11th century, it was acquired by the De Robbio family, who ruled it, together with the neighbouring area, until the 13th century, when it was contested between Vercelli and Pavia. In 1220, the latter definitively acquired it through a diploma issued by Emperor Frederick II.

Then part of the Duchy of Milan, it was entrusted to several feudal families. In 1748, it was acquired by the Kingdom of Sardinia and, in the 19th century, it became part of the province of Pavia under the newly formed Kingdom of Italy.

People closely associated with Robbio include: