Sedilo (Sardinian: Sèdilo) is a comune (municipality) in the Province of Oristano in the Italian region Sardinia, located about 110 kilometres (68 mi) north of Cagliari and about 40 kilometres (25 mi) northeast of Oristano.
Sedilo borders the following municipalities: Aidomaggiore, Bidonì, Dualchi, Ghilarza, Noragugume, Olzai, Ottana, Sorradile.