Naka-ku, Okayama

Naka-ku (中区) is one of four wards of Okayama, Okayama Prefecture, Japan. The ward has an area of 51.24 km2 and a population of 138,949. The population density is 2711 PD/km2. The name means "Central Ward."

The wards of Okayama were established when Okayama became a city designated by government ordinance on April 1, 2009.