Minami-ku, Sakai

 is a ward of the city of Sakai in Osaka Prefecture, Japan. The ward has an area of 40.44 km² and a population of 155,266. The population density is 3,839 per square kilometer. The name means "South Ward."
The wards of Sakai were established when Sakai became a city designated by government ordinance on April 1, 2006.