莱彻县（Letcher County, Kentucky）是位于美国肯塔基州东南部的一个县，东南邻维吉尼亚州。面积878平方公里。根据美国2000年人口普查，共有人口25,277人。县治怀茨堡 （Whitesburg），最大城市詹金斯 （Jenkins）。

成立于1842年3月3日。县名纪念联邦众议员、肯塔基州州长、驻墨西哥公使罗伯特·P·莱彻 （Robert Perkins Letcher）。

Letcher County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 24,519. Its county seat is Whitesburg. The county, founded in 1842, is named for Robert P. Letcher, Governor of Kentucky from 1840-1844.

Letcher County is a dry county, with the only exceptions being the Highland Winery, the city of Whitesburg, and the city of Jenkins.