The Fountain of Neptune is a fountain in Florence, Italy, situated on the Piazza della Signoria (Signoria square), in front of the Palazzo Vecchio.
This work by Bartolomeo Ammannati (1563–1565) and some assistants, such as Giambologna, was commissioned on the occasion of the wedding of Francesco I de' Medici with grand duchess Johanna of Austria in 1565. The assignment had first been given to Baccio Bandinelli, who designed the model but he died before he could start working on the block of Apuan marble.
The Neptune figure, whose face resembles that of Cosimo I de' Medici, was meant to be an allusion to the dominion of the Florentines over the sea. The figure stands on a high pedestal in the middle of an octagonal fountain. The pedestal in the middle is decorated with the mythical chained figures of Scylla and Charybdis. The statue of Neptune is a copy made in the nineteenth century, while the original is in the National Museum.