| Pesa | |
| Source1 Location: | Monte San Michele |
| Subdivision Type1: | Country |
| Length: | 53km (33miles) |
| Source1 Elevation: | 892m (2,927feet) |
| Discharge1 Avg: | variable--> |
| Basin Size: | 339km2 |
The Pesa is a river in Tuscany, central Italy. It has a length of 53 km, and, after crossing the provinces of Siena and Florence, flows into the Arno River near Montelupo Fiorentino.