| Castelu River | |
| River | |
| Countries | Romania |
|---|---|
| Counties | Constanţa County |
| Villages | Castelu |
| Mouth | Danube-Black Sea Canal |
| Length | 10 km (6 mi) |
| Basin | 21 km2 (8 sq mi) |
| Official River Code | XV.1.10b.6 |
The Castelu River is a tributary of the main branch of the Danube-Black Sea Canal in Romania.