| Cosmina | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Prahova County |
| Length: | 24km (15miles) |
| Mouth: | Telega |
| Mouth Location: | Plopeni |
| Mouth Coordinates: | 45.0712°N 25.9833°W |
| Basin Size: | 67km2 |
The Cosmina is a left tributary of the river Telega in Romania. It discharges into the Telega in Plopeni. It flows through the villages Cosmina de Sus, Cosmina de Jos, Vâlcănești and Cârjari. Its length is 24km (15miles) and its basin size is 67km2.