| Stagno | |
| Coordinates: | 43.5911°N 10.3497°W |
| Province: | Livorno (LI) |
| Comune: | Collesalvetti |
| Elevation M: | 3 |
| Population Total: | 4370 |
| Population As Of: | 2011 |
| Postal Code: | 57017 |
| Area Code: | (+39) 0565 |
Stagno is a town in Tuscany, central Italy, administratively a frazione of the comune of Collesalvetti, province of Livorno. At the time of the 2011 census its population was .
The town is about 4 km from Livorno and 12 km from Collesalvetti.