| Crasna | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Iași, Vaslui |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Rotăria, Dolhești, Podu Oprii, Tăbălăiești, Tătărăni, Crăsnășeni, Vinețești, Crasna |
| Length: | 61km (38miles) |
| Discharge1 Location: | |
| Discharge1 Avg: | 0.454m3/s |
| Mouth: | Bârlad |
| Mouth Coordinates: | 46.5131°N 27.8128°W |
| Basin Size: | 527km2 |
| Tributaries Left: | Cetățuia, Hrușca, Lohan |
| Tributaries Right: | Brădicești, Burghina |
The Crasna is a left tributary of the river Bârlad in Romania. It discharges into the Bârlad near the village Crasna.[1] The Mânjești dam is located on the Crasna. Its length is 61km (38miles) and its basin size is 527km2.