Ji'an County (simplified Chinese: 吉安县; traditional Chinese: 吉安縣; pinyin: Jí'ān Xiàn) is a county of west-central Jiangxi province, China. It is under the jurisdiction of the prefecture-level city of Ji'an.

In the present, Ji'an County has 1 subdistrict, 12 towns and 7 townships.

The population of the county was 554,693 in 1999.

27°01′37″N 114°38′10″E / 27.02694°N 114.63611°E / 27.02694; 114.63611