Sedilo (possibly sedulus of Latin diligently) is a place in the province of Oristano in Sardinia with 2,144 inhabitants (December 31, 2015). Sedilo is located 288 m s.l.m. and 10 km north-east of Ghilarza on the north bank of the applied in the 1920s reservoir Lake Omodeo which dams the Tirso.