Suisio is a comune in the Italian region of Lombardy, located about 35 kilometres (22 mi) northeast of Milan and about 14 kilometres (9 mi) southwest of Bergamo. As of 31 December 2004, it had a population of 3,614 and an area of 4.6 square kilometres (1.8 sq mi).
Suisio borders the following municipalities: Bottanuco, Chignolo d'Isola, Cornate d'Adda, Medolago.