Karongi is a district (akarere) in Western Province, Rwanda. The district's capital is Rubengera. However, it comprises Kibuye, provincial capital and a major Rwandan lakeside resort. It is one of the districts with the lowest population density of 380 inhabitants per square kilometre (980/sq mi) as of the 2022 census.
The district lies on the shores of Lake Kivu, about halfway down the lake between Gisenyi and Cyangugu. Rubengera is approximately 100km from the national capital, Kigali.