Porto Torres is a comune (municipality) and a city of the Province of Sassari in north-west of Sardinia, Italy. Founded during the 1st century BC as Colonia Iulia Turris Libisonis, it was the first Roman colony of the entire island. It is situated on the coast at about 25 kilometres (16 mi) east of Falcone Cape and in the center of the Gulf of Asinara. The port of Porto Torres is the second biggest seaport of the island, followed by the port of Olbia. The town is very close to the main city of Sassari, where the local university takes office.

The province of Sassari is a province in the autonomous island region of Sardinia, Italy. Its capital is the city of Sassari. As of 2017, the province had a population of 493,357 inhabitants.