勒星顿县（Lexington County, South Carolina）是美国南卡罗莱纳州中西部的一个县。成立于1785年。面积1,963平方公里。根据美国2000年人口普查，共有人口216,014人。县治勒星顿（Lexington）。

成立于1785年，1791年合并入奥兰治堡县，1804年恢复。县名纪念美国独立战争中列克星敦和康科德战役。

Lexington County is a county located in the U.S. state of South Carolina. As of the 2010 census, the population was 262,391, and the 2014 population estimate was 277,888. Its county seat and largest town is Lexington. The county was created in 1785. Its name commemorates the Battle of Lexington in the American Revolutionary War.