South Williamson is a unincorporated community in the Appalachian Mountains of northeastern Pike County, Kentucky, United States, on the border with West Virginia.

For statistical purposes, the United States Census Bureau has defined that community as a census-designated place (CDP).

The South Williamson area includes the surrounding Kentucky communities of Goody, Forest Hills, Toler, and Belfry.

[3] The local economy is largely fueled by coal mining, transportation, health care, and retail.

[citation needed] South Williamson is protected by a floodwall, built by the US Army Corps of Engineers in response to a devastating flood along the Tug Fork River in 1977.