Alexander John Gosse Downer, AC (born 9 September 1951) is a former Australian Liberal Party politician who was Foreign Minister of Australia from 11 March 1996 to 3 December 2007, the longest-serving in Australian history. He was also the Leader of the Opposition for eight months from 1994 to 1995. Until early February 2014, Downer was the United Nations Special Adviser to the Secretary-General on Cyprus.