Nileas
Nileas 
    Νηλέας  | |
|---|---|
| Coordinates: 38°52′N 23°24′E / 38.867°N 23.400°E | |
| Country | Greece | 
| Administrative region | Central Greece | 
| Regional unit | Euboea | 
| Municipality | Mantoudi-Limni-Agia Anna | 
| Area | |
| • Municipal unit | 129.02 km2 (49.81 sq mi) | 
| Population  (2021)  | |
| • Municipal unit | 2,261 | 
| • Municipal unit density | 18/km2 (45/sq mi) | 
| Time zone | UTC+2 (EET) | 
| • Summer (DST) | UTC+3 (EEST) | 
| Vehicle registration | ΧΑ | 
Nileas (Greek: Νηλέας) is a former municipality in Euboea, Greece, named after the river Nilèas. Since the 2011 local government reform it is part of the municipality Mantoudi-Limni-Agia Anna, of which it is a municipal unit. The municipal unit has an area of 129.017 km2. Population 2,261 (2021). The seat of the municipality was in Agia Anna.