Brenna is a comune (municipality) in the Province of Como in the Italian region Lombardy, located about north of Milan and about southeast of Como. As of 31 December 2004, it had a population of 1,860 and an area of .
Brenna borders the following municipalities: Alzate Brianza, Cantù, Carugo, Inverigo, Mariano Comense.
Brenna is twinned with: