Trezzano Rosa is a comune in the Province of Milan in the Italian region Lombardy, located about 30 kilometres northeast of Milan. As of 31 December 2004, it had a population of 3,992 and an area of 3.5 square kilometres. Trezzano Rosa borders the following municipalities: Busnago, Roncello, Grezzago, Basiano, Pozzo d'Adda.