Joanne Ratcliffe and Kirste Jane Gordon were two Australian girls who went missing while attending an Australian rules football match at the Adelaide Oval on 25 August 1973. Their disappearance, and presumed abduction and murder, became one of South Australia's most infamous crimes. The presumed murders are thought by South Australia Police and the media to be related to the disappearance of the Beaumont children in 1966. The case is sometimes referred to as the Adelaide Oval abductions.

Jane Nartare Beaumont, Arnna Kathleen Beaumont and Grant Ellis Beaumont, collectively referred to as the Beaumont children, were three Australian siblings who disappeared from Glenelg Beach near Adelaide, South Australia, on 26 January 1966 in a suspected abduction and murder.