Trequanda is a comune in the Province of Siena in the Italian region Tuscany, located about 70 kilometres southeast of Florence and about 30 kilometres 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.