| Selemnos | |
|---|---|
 | |
| Native name | Σέλεμνος (Greek) |
| Location | |
| Country | Greece |
| Physical characteristics | |
| Source | |
| • location | Panachaiko |
| Mouth | |
• location | Gulf of Corinth |
• coordinates | 38°18′43″N 21°47′32″E / 38.3120°N 21.7921°E |
| Length | approximately 20 km (12 mi) |
Selemnos (Ancient Greek: Σέλεμνος, Latin: Selemnus) is a river in the northern part of Achaea, Greece. The river flows entirely in the municipal unit of Rio and empties into the Gulf of Corinth.