Ossona (Milanese: Ossòna [uˈsɔna]) is a comune (municipality) in the Metropolitan City of Milan in the Italian region Lombardy, located about 20 kilometres (12 mi) west of Milan. As of 31 December 2004, it had a population of 3,928 and an area of 6.0 square kilometres (2.3 sq mi).

The municipality of Ossona contains the frazione (subdivision) Asmonte.

Ossona borders the following municipalities: Casorezzo, Inveruno, Arluno, Mesero, Marcallo con Casone, Santo Stefano Ticino.