| Santa Eulalia de Oscos | |
| Settlement Type: | Municipality |
| Native Name: | Santalla d'Ozcos (Eonavian) |
| Pushpin Map: | Spain |
| Pushpin Map Caption: | Location in Spain |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Asturias |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Eo-Navia |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | Castopol |
| Seat Type: | Capital |
| Seat: | Santa Eulalia de Oscos |
| Coordinates: | 43.25°N -8°W |
| Elevation Max M: | 948 |
| Area Total Km2: | 47.12 |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 33776 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | Víctor Lorido Rancaño |
| Leader Party: | PSOE |
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.
The municipality consists of only one parish, Santa Eulalia (Santalla).