| Cojmănești | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Gorj County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Cojmănești |
| Length: | 11km (07miles) |
| Mouth: | Jilțul Slivilești |
| Mouth Coordinates: | 44.7717°N 23.1401°W |
| Progression: | Jilțul Slivilești→ |
| Basin Size: | 38km2 |
| Tributaries Right: | Tehomir |
| Custom Label: | River code |
| Custom Data: | VII.1.33.2.1 |
The Cojmănești is a left tributary of the river Jilțul Slivilești in Romania. It flows into the Jilțul Slivilești in Slivilești. Its length is 11km (07miles) and its basin size is 38km2.