| Bârsău | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Maramureș County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Valea Chioarului, Șomcuta Mare, Finteușu Mare, Satulung |
| Length: | 34km (21miles) |
| Mouth: | Someș |
| Mouth Location: | Colțirea |
| Mouth Coordinates: | 47.5981°N 23.3938°W |
| Basin Size: | 164km2 |
| Tributaries Left: | Curtuiuș |
| Tributaries Right: | Ciolt, Berchezoaia, Posta |
The Bârsău (Hungarian: Borszó) is a right tributary of the river Someș in Romania. It discharges into the Someș in Colțirea.[1] Its length is 34km (21miles) and its basin size is 164km2.