Ottana (Sardinian: Otzàna) is a comune (municipality), former bishopric and Latin titular see in the Province of Nuoro in the Italian region Sardinia, located about 110 kilometres (68 mi) north of Cagliari and about 25 kilometres (16 mi) southwest of Nuoro.

The town is known for its traditional carnival costumes, including distinctive masks worn by the Boes, Merdules and Filonzana.

Ottana borders the following municipalities: Bolotana, Noragugume, Olzai, Orani, Sarule, Sedilo.

In 1110 was established a bishopric of Ottana (Italiano) or Othana in Latin.

(all Roman Rite) Only in October 2004 it was nominally restored as Latin Titular bishopric of the lowest (Episcopal) rank, named Ottana (in Curiate Italian) or Othana in Latin.