A gu (; ), or district, is an administrative unit in South Korea. There are two kinds of districts in South Korea. One is the autonomous district () of special and metropolitan cities, which is a municipal entity similar to a city with its own mayor along with its own legislative council. The other is the non-autonomous district () of municipal cities. Cities with over 500,000 people are allowed to have gu (notable exceptions to this rule are the cities of Gimhae, Hwaseong, and Namyangju).