San Martino Siccomario is a comune in the Province of Pavia in the Italian region Lombardy, located about 35 km south of Milan and about 4 km southwest of Pavia. It is now effectively part of Pavia metropolitan area. San Martino Siccomario borders the following municipalities: Carbonara al Ticino, Cava Manara, Pavia, Travacò Siccomario.