Grant Ernest John Tambling (born 20 June 1943) is an Australian politician. He is a member of the Country Liberal Party. From 1974 to 1977, he was a member of the Northern Territory Legislative Assembly. He was a member of the House of Representatives for the Division of Northern Territory from 1980 to 1983. He also served as a Senator for the Northern Territory from 1987 to 2001. He later served as Administrator of Norfolk Island from 2003 to 2007.