Folly Beach is a public city on Folly Island in Charleston County, South Carolina, United States. The population was 2,617 at the 2010 census, up from 2,116 in 2000. Folly Beach is within the Charleston-North Charleston-Summerville metropolitan area and the Charleston-North Charleston Urbanized Areas.

Folly Island is a barrier island in the Atlantic Ocean near Charleston, South Carolina. It is one of the Sea Islands and is within the boundaries of Charleston County, South Carolina. During the American Civil War, the 7-square-mile (18 km2) island served as a major staging area for troops of the Union Army that were attacking Confederate forces in the Charleston region. The largest settlement on Folly Island is Folly Beach.