Domusnovas, Domus Noas (new houses) in sardinian language, is a comune (municipality) in the Province of Carbonia-Iglesias in the Italian region Sardinia, located about 40 kilometres (25 mi) northwest of Cagliari and about 20 kilometres (12 mi) northeast of Carbonia, in the Sulcis-Iglesiente region, in the valley of the Cixerri river.