Ozzero (Milanese: or ) is a comune (municipality) in the Province of Milan in the Italian region Lombardy, located about southwest of Milan. As of 31 December 2004, it had a population of 1,337 and an area of .
The municipality of Ozzero contains the frazioni (subdivisions, mainly villages and hamlets) Soria Vecchia and Bugo.
Ozzero borders the following municipalities: Abbiategrasso and Morimondo.