| Type: | municipality |
| Official Name: | Riello |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Name3: | Riello |
| Area Total Km2: | 235 |
| Population Density Km2: | auto |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Riello is a municipality located in the province of León, Castile and León, Spain. According to the 2004 census (INE), the municipality has a population of 864 inhabitants.