Seui (<small>Sardinian and</small> ) is a comune (municipality) in the Province of Ogliastra in the Italian region Sardinia, located about north of Cagliari and about southwest of Tortolì. As of 31 December 2004, it had a population of 1,525 and an area of .
Seui borders the following municipalities: Arzana, Escalaplano, Esterzili, Gairo, Perdasdefogu, Sadali, Seulo, Ulassai, Ussassai.