Colonno ( ) is a comune (municipality) in the Province of Como in the Italian region Lombardy, located about north of Milan and about northeast of Como. As of 31 December 2004, it had a population of 557 and an area of 5.7 km<sup>2</sup>.
Colonno borders the following municipalities: Argegno, Laino, Lezzeno, Ossuccio, Pigra, Ponna, Sala Comacina.