Piazza della Cisterna is a piazza in San Gimignano, Italy. It has a triangular shape with a slight natural slope and is connected to the nearby Piazza del Duomo by an open passage. The pavement is brick and the piazza is surrounded by houses and medieval towers. In the south-west corner, the piazza meets the Arc of Becci, (l'arco dei Becci), an ancient city gate.