Big Bill Neidjie OAM (c. 1913 – 23 May 2002), nicknamed "Kakadu Man", was the last surviving speaker of the Gaagudju language, an Aboriginal Australian language from northern Kakadu, after which Kakadu National Park is named. He was an elder of the Gaagudju people and a custodian of the land, who cared deeply about preserving his culture and land.