The Duomo Vecchio or Old Cathedral (also called "La Rotonda" because of its round layout) is a Roman Catholic church in Brescia, Italy; the rustic circular Romanesque co-cathedral stands next to the Duomo Nuovo (New Cathedral) of Brescia. It is officially known as the Winter Co-Cathedral of Santa Maria Assunta, while the adjacent main cathedral is known as the Summer Cathedral.
It is one of the most important examples of Romanesque round church in Italy.