The Provisional Revolutionary Government of the Republic of South Vietnam (PRG, Vietnamese: Chính phủ Cách mạng Lâm thời Cộng hòa miền Nam Việt Nam), was formed on 8 June 1969, by the Democratic Republic of Vietnam (North Vietnam), as an armed rival government opposing the government of the Republic of Vietnam (South Vietnam) under President Nguyễn Văn Thiệu. Delegates of the National Liberation Front of South Vietnam (Viet Cong), as well as several smaller groups, participated in its creation.
The PRG was recognized as the government of South Vietnam by most communist states and Malta. It signed the 1973 Paris Peace Treaty as an independent entity, separate from both South Vietnam and North Vietnam. After the Fall of Saigon on 30 April 1975, the PRG formally replaced the Republic of Vietnam to become the nominal and representative government of South Vietnam under the official name Republic of South Vietnam (Vietnamese: Cộng hòa miền Nam Việt Nam), inheriting all properties, rights, obligations and sovereignty representation of the Republic of Vietnam. On 2 July 1976, the Republic of South Vietnam and the Democratic Republic of Vietnam constitutionally merged to form the current Socialist Republic of Vietnam.