Palazzo dei Trecento (also called Palazzo della Ragione) is a building in Treviso, Veneto, northern Italy, located in the Piazza dei Signori. It is home to Treviso municipal council. The palace was erected in the 13th and 14th centuries, as the seat of the Maggior Consiglio ("Highest Council"), the main administrative council in the city. It was designed by the venetian architect Gabriele Saccon. Built in brickworks, it has two floors, the lower one entered through a loggia. The upper floor has three triple mullioned windows. In 1944 the palace was bombed by Allied planes and nearly destroyed.