Calvenzano is a comune in the Province of Bergamo in the Italian region of Lombardy, located about 35 kilometres east of Milan and about 25 kilometres south of Bergamo. As of 31 December 2004, it had a population of 3,618 and an area of 6.5 square kilometres. Calvenzano borders the following municipalities: Arzago d'Adda, Caravaggio, Casirate d'Adda, Misano di Gera d'Adda, Treviglio, Vailate.