Carl Anthony Williams (13 October 1970[2] – 19 April 2010) was an Australian convicted murderer and drug trafficker from Melbourne, Victoria.

[2][3] On 19 April 2010, while incarcerated at HM Prison Barwon, Williams was beaten to death with the stem of an exercise bike by another inmate, Matthew Charles Johnson.

Williams spent much of his childhood in Western Melbourne with his friends and older brother Shane who died of a heroin overdose in 1997.

Williams held various labouring jobs before opening a children's clothing store in partnership with his wife, which eventually failed.

In 2002, after meeting through a mutual friend, Tony Mokbel, Williams courted the services of the murderer Andrew Veniamin as his right-hand man until early 2004.

[2] On 19 April 2010 News Limited newspapers including the Herald Sun revealed that Victoria Police were paying $8,000 in school fees for Williams's daughter, Dhakota.

Later, during the 2011 murder trial, it was revealed Williams had turned informant and had struck a deal with Assistant Commissioner Simon Overland.

Specifically, the belief was that the Victorian Police paid for Dhakota's private schooling on behalf of her father in return for his co-operation as an informant while in prison.

[21] There was speculation that the police may have agreed to pay the school fees in exchange for information and that publication of the story may have led to Williams's death.

Her first notable media attention began after an arrangement emerged between the Victorian Police and her family to pay for her private school fees whilst Carl Williams was in prison.

[31][32] In September 2024, his stepdaughter Breanane Stephens commenced legal action against the Victorian state government over Williams' death in custody.

He was bludgeoned to death with an exercise bike handle by another inmate,[21] Matthew Charles Johnson, who was convicted of the murder[34][35] and sentenced to 32 years in jail in December 2011.

[43] Williams was portrayed by Gyton Grantley in the 2008 Australian television series Underbelly, based on the events surrounding the Melbourne gangland wars from 1995 up to his arrest in 2004.