Sulcis (Maurreddia or Meurreddia in Sardinian language) is a subregion of Sardinia, Italy, in the Province of South Sardinia.
Its municipalities are: Calasetta, Carbonia, Carloforte, Giba, Gonnesa, Masainas, Narcao, Nuxis, Perdaxius, Piscinas, Portoscuso, San Giovanni Suergiu, Santadi, Sant'Anna Arresi, Sant'Antioco, Tratalias, Villaperuccio, Teulada.
Part of the region are also the islands of San Pietro and Sant'Antioco.
Today it is used the term "Basso Sulcis" (Lower Sulcis) to indicate the municipalities that belonged to the old Curatoria of Sulcis (without Cixerri valley) and, sometimes, it is erroneously attributed to the towns of Pula, Villa San Pietro, Sarroch and Domus de Maria, who never belonged to the territory of ancient Sulci but to that of Nora, never belonged to the diocese of Sulci but always to that of Cagliari and, in the Middle Ages, belonged exclusively to the Curatoria of Nuras of the Giudicato of Cagliari.