Coosawhatchie (koo-saw-HATCH-ee) is an unincorporated community and census-designated place (CDP) located in Jasper County, South Carolina, United States at the northern head of the Broad River.

The area derives its name from its original inhabitants, the Coosaw band of Native Americans and their word for river, hatchie.

Designed by British architect William Jay, the two story structure remained in use until 1840, when the county seat was moved to nearby Gillisonville.

Robert E. Lee made his headquarters in Coosawhatchie when he was fortifying the coastal defenses of South Carolina and Georgia during late 1861 and early 1862.

[7] To protect the railroad bridge in Coosawhatchie against Federal gunboats coming up the Broad River, Lee's troops dug massive earthworks along its banks.