Koinadugu District is a district in the Northern Province of Sierra Leone. It is the largest District in Sierra Leone in geographical area, and one of the least densely populated. Its capital and largest city is Kabala, which is also one of the main cities in Northern Sierra Leone. The District of Koinadugu has a population of 404,097, based on the 2015 Sierra Leone national census; and has a total area of 12,121 km2 (4,680 sq mi). Koinadugu District is subdivided into eleven chiefdoms.

Kabala is the capital and largest town of Koinadugu District in the Northern Province of Sierra Leone. Kabala is one of the main towns in Northern Sierra Leone and is set in a rural landscape, surrounded by mountains.