Grant Ernest John Tambling, AM (born 20 June 1943) is an Australian politician. He was a member of the House of Representatives from 1980 to 1983 and then a Senator for the Northern Territory from 1987 to 2001, representing the Country Liberal Party. In federal parliament, he sat with the National Country Party, later renamed National Party. He later served as Administrator of Norfolk Island from 2003 to 2007.