| Asău | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Bacău County |
| Length: | 39km (24miles) |
| Source1: | Tarcău Mountains |
| Mouth: | Trotuș |
| Mouth Location: | Asău |
| Mouth Coordinates: | 46.4342°N 26.4058°W |
| Basin Size: | 208km2 |
The Asău is a left tributary of the river Trotuș in Romania.[1] Its source is located in the Tarcău Mountains. It discharges into the Trotuș in the village Asău, near Comănești.[2] Its length is 39km (24miles) and its basin size is 208km2.
The following rivers are tributaries to the river Asău (from source to mouth):