| Alfilorios Reservoir | |
| Location Map: | Spain Asturias |
| Location Map Caption: | Location of the Alfilorios reservoir in Asturias |
| Coordinates: | 43.295°N -5.9167°W |
| Country: | Spain |
| Location: | Ribera de Arriba, Asturias |
| Construction Began: | 1960 |
| Opening: | 1990 |
| Owner: | Hydrographic Confederation of the Cantabric |
| Dam Type: | Embankment |
| Dam Length: | 171.7m (563.3feet) |
| Dam Height: | 67m (220feet) |
| Dam Volume: | 346740m2 |
| Dam Crosses: | Barrea River |
| Spillway Count: | 1 main |
| Spillway Type: | Chute Spillway |
| Spillway Capacity: | 35.5m3/s |
| Res Name: | Embalse de Alfilorios |
| Res Capacity Total: | 9.14lk=inNaNlk=in |
| Res Catchment: | 4.09km2 |
| Res Surface: | 52ha |
| Res Max Depth: | 66m (217feet) |
Alfilorios Reservoir is a reservoir in Asturias, Spain across the Barrea River. The dam is located in Ribera de Arriba, but the reservoir is between this municipality and Morcín. It has the aim of supply water to the central zone of Asturias, essentially Oviedo and also an area for fishing and canoeing.
The construction of the dam started in 1968, but one year later the works were disrupted until 1974. After this year, the construction continued until 1983.[1] The dam was finally opened in 1990.