Cusago is a comune (municipality) in the Province of Milan in the Italian region Lombardy, located about 11 km west of Milan. As of 31 December 2004, it had a population of 3,343 and an area of 11.5 km².
Cusago borders the following municipalities: Milan, Cornaredo, Settimo Milanese, Bareggio, Cisliano, Trezzano sul Naviglio, Gaggiano.