Gahini is a sector and village in Kayonza District, Eastern Province, Rwanda. It is situated on a hill, at an altitude of 1,520 metres (4,990 ft) above sea-level, close to the eastern edge of Lake Muhazi and 73 kilometres (45 mi) by road from the capital, Kigali. The village is the centre of one of the nine dioceses of the Eglise Episcopale au Rwanda, the Anglican church of Rwanda, and one of the four Rwandan sites chosen by the Church Missionary Society, who built a large mission, hospital and schools in the village.

Eastern Province is the largest, the most populous and the least densely populated of Rwanda's five provinces. It was created in early January 2006 as part of a government decentralization program that re-organized the country's local government structures.