1970 Cambodian coup d'état

1970 Cambodian coup d'état
	Part of the Cambodian Civil War
Date	18 March 1970
Location	Cambodia
Result	Successful coup Disestablishment of the Kingdom of Cambodia and establishment of the transitional government and then the Khmer Republic; Abandonment of neutrality policy and alignment with United States; Expansion of the FANK and escalation of the Cambodian Civil War; Persecution of Vietnamese Cambodians ;
Belligerents
House of Norodom ; Royal Cambodian Armed Forces loyalists; Popular Socialist Community (pro Sihanouk)	Government of Cambodia Royal Cambodian Armed Forces coup plotters; Parliament; National Assembly; Khmer Serei; Popular Socialist Community (pro Lon Nol); ; FULRO (FLC faction); Supported by:; United States (Alleged)
Commanders and leaders
Norodom Sihanouk; Sisowath Kossamak; Penn Nouth; Son Sann	Lon Nol; Lon Non; Cheng Heng; In Tam; Long Boret; Sisowath Sirik Matak; Sơn Ngọc Thành; Chhan Sokhom; Les Kosem;

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.