Gyton James Grantley (born 17 July 1980) is an Australian actor and comedian, best known for his portrayal of convicted murderer and drug trafficker Carl Williams in the hit Australian television show Underbelly, for which he was nominated for both Most Outstanding Actor in a Drama Series and Most Popular Actor for the 2009 TV Week Logie Awards and the 2008 AFI award (winning for Most Outstanding Actor in a Drama Series).