Borgoratto Mormorolo is a comune, or municipality, located in the Province of Pavia within the Italian region of Lombardy. It is situated approximately 30 km (19 mi) south of the city of Pavia and about 60 km (37 mi) south of Milan.
As of December 31, 2004, the municipality covered an area of 16.0 km2 (6.2 sq mi) and had a recorded population of 415 residents.