| Riosa | |
| Settlement Type: | Municipality |
| Flag Size: | 150 |
| 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: | Oviedo |
| Seat Type: | Capital |
| Seat: | La Vega |
| Coordinates: | 43.2°N -59°W |
| Elevation Max M: | 1773 |
| Area Total Km2: | 46.49 |
| Population Demonym: | riosano/a |
| 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: | 33160 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | José Antonio Muñiz Álvarez |
| Leader Party: | PSOE |
Riosa is a municipality and parish (administrative division) in the Autonomous Community of the Principality of Asturias, Spain. It is situated in the central mountains of Asturias. Its capital is La Vega.