The Fountain of Neptune is a monumental civic fountain located in the eponymous square, Piazza del Nettuno, next to Piazza Maggiore, in Bologna, Italy The fountain is a model example of Mannerist taste of the Italian courtly elite in the mid-sixteenth century.

Giambologna, also known as Jean de Boulogne (French), Jehan Boulongne (Flemish) and Giovanni da Bologna (Italian), was the last significant Italian Renaissance sculptor, with a large workshop producing large and small works in bronze and marble in a late Mannerist style.