Norodom Sihanouk was the King of Cambodia from 1941 to 1955 and again from 1993 until his semi-retirement and voluntary abdication on 7 October 2004 in favor of his son, the current King Norodom Sihamoni. Since his abdication, he has been known as The King-Father of Cambodia (Khmer: Preahm haviraksat), a position in which he retains many of his former responsibilities as constitutional monarch.

The son of King Norodom Suramarit and Queen Sisowath Kossamak, Sihanouk has held so many positions since 1941 that the Guinness Book of World Records identifies him as the politician who has served the world's greatest variety of political offices. These included two terms as King, two as Sovereign Prince, one as president, two as prime minister, and one as Cambodia's non-titled head of state, as well as numerous positions as leader of various governments-in-exile.

Most of these positions were only honorific, including the last position as constitutional King of Cambodia. Sihanouk's actual period of effective rule over Cambodia was from 9 November 1953, when France granted independence to Cambodia, until 18 March 1970, when Lon Nol and the National Assembly deposed Sihanouk.