Oliena (Italian pronunciation: [oˈliːena] or less correctly [oˈljɛːna]; Sardinian: Ulìana [uˈli.ana]) is a commune in the province of Nuoro, Sardinia, Italy.

The village, developed in medieval times, at the foot of a castle remembered in toponomy, remained to Arborea until its fall.

The territory of Oliena extends towards the north-eastern slope of the Supramonte,[3] as far as the eastern foot of mount Ortobene, embracing the valley crossed by Cedrino river, which opens towards the plains of Galtellì and Orosei.

The inhabited centre lies about 380 metres (1,250 ft) above sea level at the foot of a mountain that rises vertically to the Mount Corrasi.

The passage, leading to a suspension door to the north, forms a trapezoidal span surmounted by a powerful architrave with a window lintel.

The position of the territory is favourable, thanks to its healthiness and the presence of spring-waters still today, permitting to practise a rich variety of cultures on the plains (olive-groves, orchards, vineyards, kitchen gardens).