Cozzo is a comune (municipality) in the Province of Pavia in the Italian region Lombardy , located about 50 km southwest of Milan and about 40 km west of Pavia. As of 31 December 2004, it had a population of 421 and an area of 17.4 km².

Cozzo borders the following municipalities: Candia Lomellina, Castelnovetto , Langosco , Rosasco, Sant'Angelo Lomellina, Valle Lomellina, Zeme.