Nancy's Stone is a small offshore rock located along the southeastern coast of Pitcairn Island, south of St Paul's Point. It forms part of the island's rugged volcanic coastline and is classified as a small islet in geographical databases. The formation is also identified by name on the 2008 Pitcairn Islands Environment Management Plan map. Although its geographical position and name are documented, little published information is available about its naming history or possible association with a person named Nancy.