Ula Tirso (in Sardinian language just Ula) is a comune (municipality) in the Province of Oristano in the Italian region Sardinia, located about north of Cagliari and about northeast of Oristano. As of 31 December 2004, it had a population of 616 and an area of .
Ula Tirso borders the following municipalities: Ardauli, Busachi, Ghilarza, Neoneli, Ortueri.