The riel (Khmer: រៀល; sign: ៛; code: KHR) is the currency of Cambodia. There have been two distinct riel, the first issued between 1953 and May 1975. Between 1975 and 1980, the country had no monetary system. A second currency, also named "riel", has been issued since April 1, 1980. However, this currency has never gained much public acceptance, with most Cambodians preferring foreign currency. The UN peacekeeping operation of 1993 injected a large quantity of U.S. dollars into the local economy. As a result, the dollar has become the country's common currency. Riel notes are used for fractional dollar amounts as U.S. coins are not in circulation. The symbol is encoded in Unicode at U+17DB ៛ khmer currency symbol riel (HTML: ៛).

In 1953, the Cambodia branch of the Institut d'Emission des Etats du Cambodge, du Laos et du Vietnam issued notes dual denominated in piastre and riel with the riel being at par with the piastre. At the same time, the two other branches of the Institut had similar arrangements with the đồng in South Vietnam and the kip in Laos. The piastre itself was derived from Spanish pieces of eight (pesos).

Norodom Sihanouk (Khmer: នរោត្តម សីហនុ) (born 31 October 1922) 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 favour of his son, the current King Norodom Sihamoni. Since his abdication, he has been known as The King-Father of Cambodia (Preahmâhaviraksat), 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.