Olmedo (Sardinian: S' Ulumedu) is a comune (municipality) in the Province of Sassari in the Italian region of Sardinia, located about 170 kilometres (110 mi) northwest of Cagliari and about 15 kilometres (9 mi) southwest of Sassari. As of 31 December 2004, it had a population of 3,041 and an area of 33.7 square kilometres (13.0 sq mi).

Olmedo borders the following municipalities: Alghero, Sassari, Uri.

Demographic evolution