Olzai (Sardinian:Ortzài) is a comune (municipality) in the Province of Nuoro in the Italian region Sardinia, located about 110 kilometres (68mi) north of Cagliari and about 20 kilometres (12mi) southwest of Nuoro. As of 31 December 2004, it had a population of 1,016 and an area of 69.7 square kilometres (26.9sqmi).