Piazzolo (Bergamasque: ) is a comune (municipality) in the Province of Bergamo in the Italian region of Lombardy, located about northeast of Milan and about north of Bergamo. As of 31 December 2004, it had a population of 92 and an area of .
Piazzolo borders the following municipalities: Mezzoldo, Moio de' Calvi, Olmo al Brembo, Piazza Brembana, Piazzatorre, Valnegra.
In the cemetery is buried Guido Galli an Italian judge killed by the Red Brigades in the 1980s.