| Castel del Piano | |
| Official Name: | Comune di Castel del Piano |
| Coordinates: | 42.8908°N 11.5394°W |
| Region: | Tuscany |
| Province: | Grosseto (GR) |
| Frazioni: | Montegiovi, Montenero d'Orcia |
| Mayor: | Michele Bartalini |
| Area Total Km2: | 67.77 |
| Population Total: | 4814 |
| Population As Of: | 31 May 2017 |
| Population Demonym: | Casteldelpianesi or Cioli |
| Elevation M: | 637 |
| Saint: | Maria Santissima delle Grazie |
| Day: | September 8 |
| Postal Code: | 58033 |
| Area Code: | 0564 |
Castel del Piano is a town and comune (municipality) of Province of Grosseto in the Tuscany, central Italy.
The area of Castel del Piano is known to have been inhabited in prehistoric times, but the town itself is mentioned for the first time in a document from 890 AD. From 1175 to 1321 it was a possession of the Aldobrandeschi family. After the fall of the Republic of Siena, it became part of the Grand Duchy of Tuscany.
The municipality is formed by the municipal seat of Castel del Piano and the villages (frazioni) of Montegiovi and Montenero d'Orcia.
| Mayor | Term start | Term end | Party | |
|---|---|---|---|---|
| Alvaro Giannelli | 1975 | 1985 | Italian Communist Party | |
| Elia Francesco Forti | 1985 | 1995 | Italian Socialist Party | |
| Mario Rotellini | 1995 | 1999 | Italian People's Party | |
| Franco Ulivieri | 1999 | 2009 | Democrats of the Left | |
| Claudio Franci | 2009 | 2019 | Democratic Party | |
| Michele Bartalini | 2019 | Incumbent | Civic |
The city is divided into four contrade (quarters) which take part in a palio held every 8 September. The palio was raced for the first time in 1402.
The contrade are: