Juanita Nielsen

Juanita Joan Nielsen (née Smith; 22 April 1937 – disappeared 4 July 1975) was an Australian newspaper publisher, urban conservationist, and heiress. She disappeared after attending a meeting at the Carousel nightclub (also called Les Girls) in Kings Cross in Sydney on 4 July 1975. Her body has never been found.

Nielsen opposed urban development on Victoria Street, Kings Cross, Sydney, initiated by property developer Frank Theeman. She also opposed his development of the nearby suburb of Woolloomooloo. It is generally believed that she was killed because of her conservationism, and there have been strong suspicions of involvement of organised crime and corrupt police.

In the early 1980s, two men associated with Kings Cross crime boss Abe Saffron were jailed for conspiracy to kidnap Nielsen based on incidents leading up to her disappearance. A coronial inquest in November 1983 determined that Nielsen had been killed but did not identify how she died or who killed her. In 1994, a Federal parliamentary committee raised concerns about the case, particularly the fact that the National Crime Authority was using Saffron's deputy and manager of the Carousel Club, James McCartney Anderson, as a protected informer, even though he was a suspect in the disappearance and other criminal activity.

The unsolved mystery has continued to be a concern for the Australian community and has inspired several films.