Castelnuovo Berardenga is a comune (municipality) in the province of Siena in the Italian region Tuscany, located about 50km southeast of Florence and about 14km east of Siena. Since 1932 it is included in the Chianti wine-production area. The Battle of Montaperti between Guelphs and Ghibellines was fought nearby on 4 September 1260. The territory of Castelnuovo Berardenga borders that of the comuni of Asciano, Bucine, Castellina in Chianti, Gaiole in Chianti, Monteriggioni, Radda in Chianti, Rapolano Terme and Siena.
