Ōmuta is a city in Fukuoka Prefecture on the island of Kyūshū, Japan. As of 31 December 2023, the city had an estimated population of 106,393 in 55,373 households, and a population density of 1,300 persons per km2. The total area of the city is 81.45 km2 (31.45 sq mi).

Fukuoka Prefecture is a prefecture of Japan located on the island of Kyūshū. Fukuoka Prefecture has a population of 5,109,323 and has a geographic area of 4,986 km2. Fukuoka Prefecture borders Saga Prefecture to the southwest, Kumamoto Prefecture to the south, and Ōita Prefecture to the southeast.