The Melbourne gangland killings were the murders in Melbourne, Victoria, Australia of 36 criminal figures or partners between 16 January 1998 and 13 August 2010. The murders were in a series of retributional murders involving various underworld groups. The deaths caused a sustained power vacuum within Melbourne's criminal community, as various factions fought for control and influence. The majority of the murders are still unsolved, although police from the Purana Taskforce believe that Carl Williams was responsible for ten of them. The period culminated in the arrest of Carl Williams, who pleaded guilty on 28 February 2007 to three of the murders.
Since the confession of Williams, the ultimate source of the violence has become public knowledge. On his 29th birthday while meeting with Jason Moran and his half brother Mark Moran on 13 October 1999 at a suburban park in Gladstone Park, Jason Moran shot Carl Williams in the stomach over a dispute about money earned in the amphetamine trade. Through the period after his run-in with the Moran family, Williams commenced a war with the aim of killing all of the Moran clan.
The murder of former lawyer Mario Condello on 6 February 2006, caused speculation of a possible resurgence in the killings, although this was denied by police.
On 19 April 2010, Carl Williams died while incarcerated at Barwon Prison after being attacked by an inmate. Williams would have been 71 before becoming eligible for parole.
The majority of underworld crime figures and major incidents can be traced back to the Painters and Dockers Union that existed on Melbourne's waterfront after the Second World War. The Union had a Mafia-like structure, and most criminal activity was centred around control of the Union, and the cut associated with the drugs (primarily heroin and cocaine) that passed through the port. The Melbourne Markets were seen as a natural distribution point for these illegal substances (they were just across the road from the docks area).