The SS Cawarra was a paddle-steamer that sank on 12 July 1866 in Newcastle harbour, New South Wales, Australia sending sixty people to their deaths. The sinking was one of the worst maritime disasters in Australian history. While only one passenger survived the sinking, 60 people were already dead. The wreck today sits beneath the wreckage of three more vessels that have since foundered in the harbour. Along with other wrecks they were used in the construction of the Stockton breakwall where plaques commemorate the loss of each of the ships including the Cawarra.