Tineo (Asturian Tinéu) is a concejo (municipality) in the Principality of Asturias, Spain. It is situated on a small tributary of the Narcea River. It is the second-largest municipality in Asturias. It is bordered to the north by Valdés, to the south by Cangas del Narcea, to the west by Villayón and Allande, and to the east by Salas, Belmonte de Miranda and Somiedo.

Mining, agriculture and stock-rearing have been the principal industries since the early 20th century.