Illano (Eonavian: Eilao) is a municipality in the Principality of Asturias Spanish autonomous community. It is bordered on the north by Boal, on the south by San Martín de Oscos, on the east by Boal,  Villayón and Allande, and on the west by Villanueva de Oscos and Castropol.

Illano (Eonavian: Eilao) is a municipality in the Principality of Asturias Spanish autonomous community. It is bordered on the north by Boal, on the south by San Martín de Oscos, on the east by Boal,  Villayón and Allande, and on the west by Villanueva de Oscos and Castropol.