| Busu River | |
| Subdivision Type1: | Country |
| Subdivision Type3: | Region |
| Subdivision Name3: | Morobe Province |
| Length Km: | 75 |
| Length Ref: | [1] |
| Discharge1 Location: | Near mouth |
| Discharge1 Avg: | [2] |
| Source1 Location: | Saruwaged Range, Papua New Guinea |
| Source1 Coordinates: | -6.3167°N 147.0864°W |
| Mouth: | Huon Gulf |
| Mouth Coordinates: | -6.7289°N 147.0514°W |
| Basin Size Km2: | 1,311.32 |
| Basin Size Ref: | [3] |
The Busu River is a river located near Wagang, Lae in Morobe Province of Papua New Guinea.[4] It is the fastest-flowing river in Papua New Guinea[5] and the sixth-fastest in the world.