| Ansedonia | |
| Coordinates: | 42.4106°N 11.2886°W |
| Province: | Grosseto (GR) |
| Comune: | Orbetello |
| Elevation M: | 13 |
| Population Total: | 116 |
| Population As Of: | 2011 |
| Gentilic: | Ansedonian |
| Postal Code: | 58015 |
| Area Code: | (+39) 0564 |
Ansedonia is a frazione of the comune of Orbetello, in the province of Grosseto, southern Tuscany (Italy). At the time of the 2001 census, its population was 88.[1]
It is a renowned tourist resort. The village lies near the ruins of the ancient Roman town of Cosa.