Bosa is a town and comune in the province of Oristano, part of the Sardinia region of Italy. Bosa is situated about two-thirds of the way up the west coast of Sardinia, on a small hill, about 3 kilometres inland on the north bank of the Temo River. The town has maintained a population of around 8,000 people for a significant amount of time, but has an urban character that has differentiated it from other locations in Sardinia. It is one of I Borghi più belli d'Italia.