| Santiáu de Sierra | |
| Settlement Type: | Parish |
| Pushpin Map: | Spain |
| Coordinates: | 43.2167°N -6.4333°W |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Asturias |
| Subdivision Type2: | Province |
| Subdivision Name2: | Asturias |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Cangas del Narcea |
Santiáu de Sierra is one of 54 parish councils in Cangas del Narcea, a municipality within the province and autonomous community of Asturias, in northern Spain.
Its villages include: Becerrales, Cadrixuela, La Castañal, Bendieḷḷu, Nandu, Parrondu, Santiagu and Siasu.