Buonconvento is a comune (municipality) in the Province of Siena in the Italian region Tuscany, located about 70 kilometres (43 mi) south of Florence and about 25 kilometres (16 mi) southeast of Siena in the area known as the Crete Senesi.

[3] Buonconvento (from the Latin bonus conventus, "happy place") is mentioned for the first time in 1100.

It was surrounded by a line of walls starting from 1371, carried on by the Republic of Siena to which it belonged until 1559, when it became part of the Grand Duchy of Tuscany.

The church of Santi Pietro e Paolo has a Madonna Enthroned with Child (c. 1450) by Matteo di Giovanni and an early-fifteenth century fresco of the Sienese school.

Inhabited places in the comune consist of the town of Buonconvento, the frazioni of Bibbiano, Ponte d'Arbia and Serravalle, and other settlements including Castelnuovo Tancredi, Chiatina, Percenna and Piana.