Musei is a comune (municipality) in the Province of Carbonia-Iglesias in the Italian region Sardinia, located about 40 kilometres (25 mi) west of Cagliari and about 20 kilometres (12 mi) northeast of Carbonia. As of 31 December 2004, it had a population of 1,493 and an area of 20.3 square kilometres (7.8 sq mi).