| Trequanda | |
| Official Name: | Comune di Trequanda |
| Coordinates: | 43.1833°N 51°W |
| Region: | Tuscany |
| Province: | Siena (SI) |
| Frazioni: | Petroio, Castelmuzio |
| Mayor Party: | centre-left |
| Mayor: | Andrea Francini |
| Area Total Km2: | 64.1 |
| Population Footnotes: | [1] |
| Population Total: | 1380 |
| Population As Of: | 31 December 2010 |
| Population Demonym: | Trequandini |
| Elevation M: | 453 |
| Postal Code: | 53020 |
| Area Code: | 0577 |
Trequanda is a comune (municipality) in the Province of Siena in the Italian region Tuscany, located about 70km (40miles) southeast of Florence and about 30km (20miles) southeast of Siena.
Trequanda borders the following municipalities: Asciano, Pienza, Rapolano Terme, San Giovanni d'Asso, Sinalunga and Torrita di Siena and consists of the following villages: Trequanda, Castelmuzio and Petroio.
The parish church, in Gothic-Romanesque style, was built from 1327, and later renovated in Renaissance style. It houses an Ascension attributed to Il Sodoma and a terracotta of "Madonna with Child" attributed to Andrea Sansovino. The high altar (15th century) is by Giovanni di Paolo.