Minami-ku is one of four wards of Okayama, Okayama Prefecture, Japan. The ward has an area of 127.36 km2 and a population of 165,193. The population density is 1,297 per km2. The name means "South Ward." The wards of Okayama were established when Okayama became a city designated by government ordinance on April 1, 2009.