Portoscuso, Portu de Scusi in sardinian language, is a comune (municipality) in the Province of Carbonia-Iglesias in the Italian region Sardinia, located about 75 km west of Cagliari and about 14 km northwest of Carbonia. The languages used here is Italian and Sardinian Campidanese.
Portoscuso borders the following municipalities: Carbonia, Gonnesa, San Giovanni Suergiu.
The town originated a hamlet inhabited by tuna and coral fishermen. It became a comune in 1853. Notable sights include the Spanish Tower, the church of Madonna d'Itria and Arsenal (known as Su Pranu).
At Portoscuso, there is Sulcis Power Station, the largest power station of Sardinia, whose chimney is the tallest man-made structure on Sardinia.
- ^ All demographics and other statistics: Italian statistical institute Istat.