The Battistero di San Giovanni (Italian: "Baptistry of St. John") is a religious building in Siena, Italy. It is located in the square with the same name, near the final spans of the choir of the city's cathedral. It was built between 1316 and 1325 by Camaino di Crescentino, the father of Tino di Camaino. The façade, in Gothic style, is unfinished in the upper part, such as the apse of the cathedral.