Sant'Antonio di Gallura is a municipality in the Province of Gallura North-East Sardinia in the Italian region Sardinia, located about 200 kilometres (120 mi) north of Cagliari and about 20 kilometres (12 mi) northwest of Olbia. Sant'Antonio di Gallura borders the following municipalities: Arzachena, Calangianus, Luras, Olbia, Telti.