Dew Barn is a historic tobacco barn for curing leaves located near Zion, Marion County, South Carolina. It was built before 1935, and is a hewn-timber tobacco barn with a steep, metal-covered gable roof, surrounded on all sides by a metal-roofed shed. The barn has an arched brick firebox, which supplied the heat for curing. It was listed in the National Register of Historic Places in 1984.