| Lago di Chiusi | |
| Location: | Province of Siena, Tuscany |
| Coords: | 43.0561°N 11.9655°W |
| Inflow: | Tresa |
| Outflow: | Canale Maestro della Chiana |
| Pushpin Map: | Tuscany |
| Basin Countries: | Italy |
| Area: | 3.87km2 |
| Elevation: | 251m (823feet) |
Lago di Chiusi is a lake in the Province of Siena, Tuscany, Italy. At an elevation of 251 m, its surface area is 3.87 km².
Like other lakes in Etruria, such as Lake Bolsena and Lake Vico, it was formed from a volcanic crater.[1]