Isola San Giulio or San Giulio Island is an island within Lake Orta in Piedmont, northwestern Italy. The island is 275 metres long (north/south), and is 140 metres wide (east/west). The most famous building on the island is the Basilica di San Giulio close to which is the monumental old seminary (1840s). Since 1976 it has been transformed into a Benedictine monastery. The little island, just west of the lakeshore village of Orta San Giulio, has very picturesque buildings, and takes its name from a local patron saint (Julius of Novara), who lived in the second half of the 4th century.