The Dunbar was a full-rigged ship designed and built from 1852 to 1853 by James Laing & Sons of Deptford Yard in Sunderland, England and used for maritime trade, as a troop ship and transport. The Dunbar was wrecked near the entrance to Sydney Harbour, Australia in 1857 with the loss of 121 lives. The wreck of the Dunbar ranks as one of Australia's worst maritime disasters, with the event still retained in the social history of Sydney and NSW.