Norodom Sihamoni is King of Cambodia. He became King on 14 October 2004, a week after the abdication of his father, Norodom Sihanouk.

The monarchy of Cambodia refers to the constitutional monarchy of the Kingdom of Cambodia. The King of Cambodia is the head of state and head of the ruling Royal House of Norodom. In the contemporary period, the king's power has been limited to that of a symbolic figurehead. The monarchy had been in existence since at least 68 AD except during its abolition from 1970 to 1993. Since 1993, the king of Cambodia has been an elected monarch, making Cambodia one of the few elective monarchies of the world. The king is elected for life by the Royal Council of the Throne, which consists of several senior political and religious figures. Candidates are chosen from among male descendants of King Ang Duong who are at least 30 years old, from the two royal houses of Cambodia.