| Crasna | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Covasna County |
| Length: | 9km (06miles) |
| Source1: | Mount Tătăruțu |
| Source1 Location: | Siriu Mountains |
| Mouth: | Buzău |
| Mouth Location: | Crasna |
| Mouth Coordinates: | 45.5867°N 26.1482°W |
| Basin Size: | 25km2 |
| Tributaries Right: | Urlătoarea, Manea |
The Crasna is a right tributary of the river Buzău in Romania. It discharges into the Buzău in the village Crasna.[1] Its length is 9km (06miles) and its basin size is 25km2.