The Cambodian Civil War (Khmer: សង្គ្រាមស៊ីវិលកម្ពុជា) was a military conflict that pitted the forces of the Communist Party of Kampuchea (known as the Khmer Rouge) and their allies the Democratic Republic of Vietnam (North Vietnam) and the Viet Cong against the government forces of the Kingdom of Cambodia and, after October 1970, the Khmer Republic, which were supported by the United States (U.S.) and the Republic of Vietnam (South Vietnam).
Perang Saudara Kamboja (bahasa Khmer: សង្គ្រាមស៊ីវិលកម្ពុជា) adalah sebuah konflik militer yang mengadu kekuatan Partai Komunis Kampuchea (dikenal sebagai Khmer Merah) dan sekutunya Republik Demokratik Vietnam (Vietnam Utara) dan Viet Cong melawan pasukan pemerintah dari Kerajaan Kamboja dan, setelah bulan Oktober 1970, Republik Khmer, yang didukung oleh Amerika Serikat (AS) dan Republik Vietnam (Vietnam Selatan).