The Old Slave Mart is a building located at 6 Chalmers Street in Charleston, South Carolina that once housed an antebellum-period slave-auction gallery. Constructed in 1859, the building is believed to be the last extant slave auction facility in South Carolina. In 1975, the Old Slave Mart was added to the National Register of Historic Places for its role in Charleston's African American history. Today, the building houses the Old Slave Mart Museum.