Brunello 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 1,006 and an area of .
The municipality of Brunello contains the frazioni (subdivisions, mainly villages and hamlets) Collodri and Rosea.
Brunello borders the following municipalities: Azzate, Buguggiate, Castronno, Gazzada Schianno, Morazzone, Sumirago.