Abraham Gilbert Saffron (6 October 1919 – 15 September 2006) was an Australian hotelier, nightclub owner and property developer who was one of the major figures in organised crime in Australia in the latter half of the 20th century. He gained nationwide notoriety in the media, earning various nicknames including "Mr Sin", "a Mr Big of Australian crime" and "the boss of the Cross" (a reference to the Kings Cross red-light district, where he owned numerous businesses).