Naka-ku (中区) is one of four wards of Okayama, Okayama Prefecture, Japan. The ward has an area of 51.24 km (19.78 sq mi) and a population of 138,949. The population density is 2,711 inhabitants per square kilometer (7,020/sq mi). The name means "Central Ward."

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

Media related to Naka-ku, Okayama at Wikimedia Commons

• 岡山市中区役所 (Ward office official home page)

34°40′15″N 133°56′35″E / 34.67083°N 133.94306°E / 34.67083; 133.94306