Tombolo is a comune (municipality) in the Province of Padua in the Italian region Veneto, located about 45 km northwest of Venice and about 25 km north of Padua. Tombolo borders the following municipalities: Cittadella, Galliera Veneta, San Giorgio in Bosco, San Martino di Lupari, and Villa del Conte. Its frazione of Onara was the seat of the Ezzelini family of Italian medieval lords until 1199; it is also home to a marshy landscape now preserved by a regional park.