San Lorenzo Cathedral is the episcopal church of the Roman Catholic Diocese of Lugano in Lugano, in the Swiss canton of Ticino. The church, dedicated to Saint Lawrence, was built in 818 as a parish church. In 1078, it became a collegiate church. Since 1884, San Lorenzo has been the seat of the Apostolic Administration for Ticino, from which the Diocese of Lugano was formed in 1971.