Ottana () is a comune (municipality), former bishopric and Latin titular see in the Province of Nuoro in the Italian region Sardinia. It is located about north of Cagliari and about southwest of Nuoro.
The commune of Ottana borders the following municipalities: Bolotana, Noragugume, Olzai, Orani, Sarule, Sedilo.
The town is known for its traditional carnival costumes, including distinctive masks worn by the Boes, Merdules and Filonzana.
The date of the establishment of the diocese of Ottana (Othana in Latin) is unknown, but it was in existence by the first decade of the 12th century. It was a suffragan of the archbishop of Torres (Sassari).
Bishop Antonio di AlcalÃÂ held a diocesan synod on 3 June 1475.
Pope Julius II, in his papal bull "Aequum Reputamus" of 8 December 1503, suppressed the diocese of Bisarcio, the Diocese of Castro, and Diocese of Ottana. Their territories, and some from the Archdiocese of Sassari, were combined and reassigned to establish the Diocese of Alghero. Alghero was made a suffragan of Sassari. Ottana was no longer a cathedral city. The town was in a malarial zone, and it gradually lost nearly all of its population in thr 16th century.
Ottana is the site of the Romanesque church of San Nicola, built 1150.
In October 2004, the title, but not the diocese itself, was restored as a Latin titular bishopric, named Ottana in Italian, or Othana in Latin.
Holders of the title include: