Crosio della Valle is a comune (municipality) in the Province of Varese in the Italian region Lombardy, located about northwest of Milan and about southwest of Varese. As of 31 December 2004, it had a population of 604 and an area of .
Crosio della Valle borders the following municipalities: Azzate, Casale Litta, Daverio, Mornago, Sumirago.