| Balasau | |
| Coordinates: | 1.6°N 111.4°W |
| Pushpin Map: | Borneo |
| Pushpin Label Position: | right |
| Subdivision Type: | Country |
| Subdivision Name: |  Malaysia |
| Subdivision Type1: | State |
| Elevation M: | 110 |
Balasau (also known as Rumah Manggoi or Belasau) is a settlement in Sarawak, Malaysia. It lies approximately 118.7km (73.8miles) east of the state capital Kuching.
Neighbouring settlements include: