This is a list of heads of state of Cambodia from the accession of King Norodom on 19 October 1860 to the present day. It lists various heads of state which served in the modern history of Cambodia, under several different regimes and with various titles.
From 1860 onward, there have been 12 heads of state (acting heads of state are not counted).
The 1970 Cambodian coup d'état (Khmer: រដ្ឋប្រហារឆ្នាំ១៩៧០, French: Coup d'État de 1970) was the removal of the Cambodian Chief of State, Prince Norodom Sihanouk, after a vote in the National Assembly on 18 March 1970. Emergency powers were subsequently invoked by the Prime Minister Lon Nol, who became effective head of state, and led ultimately to the removal of Queen Sisowath Kossamak and the proclamation of the Khmer Republic later that year. It is generally seen as a turning point in the Cambodian Civil War. No longer a monarchy, Cambodia was semi-officially called "État du Cambodge" (State of Cambodia) in the intervening six months after the coup, until the republic was proclaimed.
It also marked the change of Cambodia involvement in the Vietnam War, as Lon Nol issued an ultimatum to North Vietnamese forces to leave Cambodia.
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