Santa Eulalia de Oscos (Eonavian: Santalla d'Ozcos) is a municipality in the Autonomous Community of the Principality of Asturias, Spain. It is bordered on the north by Villanueva de Oscos, on the south and west by Lugo province of Galicia, and on the east by Villanueva de Oscos, San Martín de Oscos and Grandas de Salime.

Santa Eulalia de Oscos Santalla d'Ozcos  (Eonavian)
Municipality
Flag Coat of arms
Santa Eulalia de Oscos Location in Spain
Coordinates: 43°15′N 7°1′W / 43.250°N 7.017°W / 43.250; -7.017
Country	Spain
Autonomous community	Asturias
Province	Asturias
Comarca	Eo-Navia
Judicial district	Castopol
Capital	Santa Eulalia de Oscos
Government
• Alcalde	Víctor Lorido Rancaño (PSOE)
Area
• Total	47.12 km2 (18.19 sq mi)
Highest elevation	948 m (3,110 ft)
Population  (2018)[1]
• Total	453
• Density	9.6/km2 (25/sq mi)
Time zone	UTC+1 (CET)
• Summer (DST)	UTC+2 (CEST)
Postal code	33776

The municipality consists of only one parish, Santa Eulalia (Santalla).