Created by the Italian sculptor Verrocchio, this statue is a commemoration of the 15th-century captain-general of the Republic of Venice. It is located on the Campo Santi Giovanni e Paolo together with Scuola Grande di San Marco and Basilica of Saint John and Paul so you can see several interesting things at one place.
Wikipedia https://en.wikipedia.org/wiki/Equestrian_statue_of_Bartolomeo_Colleoni
Address Campo Giovanni e Paolo Santissimi, 30122 Venice, Italy
Coordinates 45°26'21.135" N 12°20'28.905" E