Kusu is a town located in Kusu District, Ōita Prefecture, Japan. As of 30 November 2023, the town had an estimated population of 14,085 in 6590 households, and a population density of 49 persons per km2. The total area of the city is 286.51 km2 (110.62 sq mi)

Ōita Prefecture is a prefecture of Japan located on the island of Kyūshū. Ōita Prefecture has a population of 1,136,245 and has a geographic area of 6,340 km2. Ōita Prefecture borders Fukuoka Prefecture to the northwest, Kumamoto Prefecture to the southwest, and Miyazaki Prefecture to the south.