Porto Porres (locally Poltu Torra in Sassarese), is a town in northern Sardinia (province of Sassari), of about 20,000 inhabitants. It has an archeological area, with ruins of Roman baths. There is also the Romanesque Cathedral of San Gavino.

The port is connected by ferries with Genoa and Marseille. Expressway (SS131/E25) to Sassari and Cagliari. National road to Santa Teresa Gallura (SS200).

Chemical industries support the modern economy of Porto Porres..