| Ruzibazi River | |
| Native Name: | fr|Rivière Ruzibazi |
| Pushpin Map: | Burundi |
| Subdivision Type1: | Country |
| Subdivision Name1: | Burundi |
| Subdivision Type2: | Province |
| Subdivision Name2: | Bujumbura Rural Province, Bururi Province, Rumonge Province |
| Mouth Location: | Lake Tanganyika |
| Mouth Coordinates: | -3.7317°N 29.3135°W |
The Ruzibazi River (fr|Rivière Ruzibazi) is a river in Burundi.
The RuziBazi River rises to the east of Mukike on the border between Bujumbura Rural Province and Bururi Province.It flows along this border in a generally south-southeast direction to the border between Rumonge Province and Bururi Province, which it defines for a short distance, then turns west and flows to its mouth on Lake Tanganyika, which it enters to the south of Magara.
The surroundings of the Ruzibazi River are a mosaic of agricultural land and natural vegetation.The area is quite densely populated, with 207 inhabitants per square kilometer as of 2016.The climate in the area is temperate.The average annual temperature is .The warmest month is July, when the average temperature is, and the coldest is November, with .Average annual rainfall is . The rainiest month is December, with an average of of precipitation, and the driest is July, with of precipitation.
The Monge Forest Nature Reserve contains a remnant of natural Afro-montane forest on the hills of the southern extension of the Congo-Nile ridge, covering parts of the communes of Mukike, Muhuta and Bugarama.Some of the streams flow into the Ruzibazi River, while others flow into the Nile Basin.
The 15MW Ruzibazi Hydroelectric Power Station is in Rutumo colline, Minago zone in the Commune of Rumonge.The dam is on the Ruzibazi River between the Commune of Bugarama and the Commune of Rumonge.Construction by the Chinese company Sinohydro began in October 2018 and was completed ahead of schedule in July 2022.It was inaugurated on 6 September 2022 in a ceremony attended by Evariste Ndayishimiye, President of Burundi.