| Negreasca | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Buzău County |
| Length: | 20km (10miles) |
| Mouth: | Călmățui |
| Mouth Coordinates: | 44.9931°N 26.929°W |
| Progression: | Călmățui→ |
| Basin Size: | 73km2 |
The Negreasca is a left tributary of the river Călmățui in Romania. It flows into the Călmățui in Albești. Its length is 20km (10miles) and its basin size is 73km2.