Which Olympians have been heads of state – such as a President, Prime Minister, or King or Queen? We know of this happening 8 times, as follows:
[table]
Athlete,NOC,Sport,Era,Notes
Taro Aso,JPN,SHO,1976,Prime Minister of Japan 2008-09.
Juan Carlos Crown Prince de Borbón,ESP,SAI,1972,King of Spain 1975-present.
Albert Prince Grimaldi,MON,BOB,1988-2002,Prince of Monaco 2005-present.
Crown Prince Harald,NOR,SAI,1964-72,King of Norway 1991-present.
Crown Prince Konstantinos,GRE,SAI,1960,King of Greece 1964-73.
Crown Prince Olav,NOR,SAI,1928,King of Norway 1957-91.
Pál Schmitt,HUN,FEN,1968-76,President of Hungary 2010-12.
Marcus Stephen,NRU/SAM,WLT,1992-2000,President of Nauru 2007-11.
[/table]
See also http://www.sports-reference.com/olympics/friv/lists.cgi
Actually, Taro Aso never was head of state, as Japan has an emperor. He was head of government though.
Missing: The (new) King of Spain.
And Juan Carlos is not King anymore.
@Jeroen Heijmans: The Japanese Emperor has a strange legal status other then Head of State, often translated as “symbol of the state”. This may or may not make Aso the head of state.