Robbio is a city and comune (municipality) located in the Province of Pavia within the Lombardy region of northern Italy. It is situated approximately 50 km southwest of Milan and about 45 km west of Pavia.
The municipality is part of the Lomellina traditional region. It shares borders with several neighboring municipalities, including Borgolavezzaro, Castelnovetto, Confienza, Nicorvo, Palestro, Rosasco, and Vespolate.