| Nyabusyo River | |
| Pushpin Map: | Burundi |
| Subdivision Type1: | Country |
| Subdivision Name1: | Burundi |
| Mouth Location: | Nyakagezi River |
| Mouth Coordinates: | -3.0591°N 29.9394°W |
The Nyabusyo River (fr|Rivière Nyabusyo) is a river in Burundi, a tributary of the Kinyankuru River.
The Nyabusyo flows southwest along the border between Ngozi Province and Karuzi Province to join the Kinyankuru River from the left.The Kinyankuru is in turn a tributary of the Ruvubu River.Tributaries of the Nyabusyo include the Gashayura, Nyankezi and Tambi / Rusimbuko.
The surroundings of Nyabusyo are a mosaic of farmland and natural vegetation. The area is densely populated, with 331 inhabitants per square kilometer as of 2016.The average annual temperature in the area is .The warmest month is September, when the average temperature is, and the coldest is April, with .Average annual rainfall is .The wettest month is December, with an average of of precipitation, and the driest is July, with of precipitation.
There is a unmanaged marsh on the Nyabusyo in the Commune of Tangara, Ngozi Province.In Karuzi Province there is a unmanaged marsh on the Nyabusyo in the Commune of Bugenyuzi, and a unmanaged marsh on the Nyabusyo in the Commune of Gitaramuka.