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 kilometres (47 mi) west of Cagliari and about 14 kilometres (9 mi) 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.