Musei is a comune (municipality) in the Province of Sulcis Iglesiente in the Italian region Sardinia, located about west of Cagliari and about northeast of Carbonia. As of 31 December 2004, it had a population of 1,493 and an area of .
Musei borders the following municipalities: Domusnovas, Iglesias, Siliqua, Villamassargia.