The Waterloo Bay massacre, also known as the Elliston massacre, was a clash between European settlers and Aboriginal Australians that took place on the cliffs of Waterloo Bay near Elliston, South Australia, in late May 1849. Part of the Australian frontier wars, the most recent scholarship indicates that it is likely that it resulted in the deaths of tens or scores of Aboriginal people. The events leading up to the fatal clash included the killings of three European settlers by Aboriginal people, the killing of one Aboriginal person, and the death by poisoning of five others by European settlers. The limited archival records indicate that three Aboriginal people were killed or died of wounds from the clash and five were captured, although accounts of the killing of up to 260 Aboriginal people at the cliffs have circulated since at least 1880.