Porto Torres (Sassarese:Posthudorra, Sardinian:Pòrtu Turre) is a comune and city in northern Sardinia, in the Province of Sassari.
It is situated on the north-west coast about 25 kilometres (16mi) east of the Gorditanian promontory (Capo del Falcone), and on the spacious bay of the Gulf of Asinara.