Langxi County () is a county in the southeast of Anhui Province, People's Republic of China, bordering Jiangsu Province to the north. It is under the jurisdiction of the prefecture-level city of Xuancheng. It has a population of and an area of . The government of Langxi County is located in Jianping Town.
Langxi County has jurisdiction over eight towns and nine townships.
Langxi County is divided to 8 towns and 4 townships.
The county is served by Langxi South railway station, situated near Shizi town.