Las Plassas, Is Pratzas or Is Platzas in the Sardinian language, is a comune (municipality) in the Province of South Sardinia in the Italian region Sardinia, located about 50 kilometres (31 miles) north of Cagliari and about 15 kilometres (9 miles) northeast of Sanluri.

Las Plassas borders the following municipalities: Barumini, Pauli Arbarei, Tuili, Villamar, Villanovafranca.