Chi'an is a prefecture-level city in the central region of Jiangxi province in the People's Republic of China. It lies in the central part of the province and borders Hunan province to the west. The city covers an area of 25,219 square kilometres.
At the 2020 census, Chi'an had a population of 4,469,176, of whom 643,399 lived in the built-up area formed by its two urban districts. The city sits next to the Luoxiao Mountains, with the Gan River running through its middle. Local dialects include a form of Gan Chinese as well as Hakka Chinese.