| Siejo | |
| Settlement Type: | Parish |
| Pushpin Map: | Spain |
| Coordinates: | 43.3333°N -4.5833°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: | Peñamellera Baja |
| Population Total: | 96 |
Siejo is one of eight parishes (administrative divisions) in Peñamellera Baja, a municipality within the province and autonomous community of Asturias, in northern Spain.
The population is 96 (INE 2011).