San Pietro Island (Italian: Isola di San Pietro, Ligurian Tabarchino: Uiza de San Pé, Sardinian: Isula 'e Sàntu Pèdru) is an island approximately off the South western Coast of Sardinia, Italy, facing the Sulcis peninsula. With it is the sixth largest island of Italy by area. The approximately 6,000 inhabitants are mostly concentrated in the fishing town of Carloforte, the only comune in the island. It is included in the province of Carbonia-Iglesias. It is named after Saint Peter.