Cuvio () is a comune (municipality) in the Province of Varese in the Italian region Lombardy, located about northwest of Milan and about northwest of Varese.
Cuvio borders the following municipalities: Azzio, Barasso, Casalzuigno, Castello Cabiaglio, Cocquio-Trevisago, Comerio, Cuveglio, Gavirate, Orino.