During the Cold War, the Indochina Wars were a series of wars which were waged in Indochina from 1945 to 1991, by communist forces against the opponents. The term "Indochina" referred to former French Indochina, which included the current states of Vietnam, Laos, and Cambodia. In current usage, it applies largely to a geographic region, rather than to a political area. The wars included:The First Indochina War began after the end of World War II in 1945 and lasted until the French defeat in 1954. After a long campaign of unsuccessful resistance against the French and the Japanese, Viet Minh forces claimed a victory in the August Revolution after Japanese forces surrendered to the Allies on 15 August 1945. In the War in Vietnam (1945–1946), British forces temporarily occupied the South with the objective of disarming Japanese forces, starting from 13 September 1945, only to restore French colonial control in 1946. Meanwhile, the communist Viet Minh sought to consolidate power by terrorizing and purging rival Vietnamese nationalist groups and Trotskyist activists. In the United Nations, and through their alliance with the United Kingdom and the United States, the French demanded return of their former Indochina colony prior to agreeing to participate in the NATO alliance opposing Soviet expansion beyond the countries of the Warsaw Pact in the Cold War. The Viet Minh coalition continued fighting the French with support from China and the Soviet Union, ultimately forcing the NATO-backed French out of North Vietnam as a result of 1954 Geneva Conference. The Second Indochina War began as a conflict between the United States-backed South Vietnamese government and its opponents, both the North Vietnamese-based communist Viet Cong and the People's Army of Vietnam (PAVN), known in the West as the North Vietnamese Army (NVA). The conflict began in 1955 and lasted until 1975 when the North Vietnamese conquered South Vietnam. The United States, which had supported France during the first Indochina war, backed the Republic of Vietnam government in opposition to the communist Viet Cong and PAVN. The North benefited from military and financial support from China and the Soviet Union, members of the communist bloc. Fighting also occurred during this time in Cambodia between the US-backed government, the PAVN, and the communist-backed Khmer Rouge and in Laos between the US-backed government, the PAVN, and the communist-backed Pathet Lao. The Third Indochina War was a period of prolonged conflict following the Second Indochina War, in which several wars were fought:The Cambodian–Vietnamese War began when Vietnam invaded Cambodia and deposed the genocidal Khmer Rouge regime. The war lasted from May 1975 to December 1989.The Sino-Vietnamese War was a four-week war fought in February–March 1979 between the People's Republic of China and the Socialist Republic of Vietnam. The Chinese launched a punitive expedition in revenge for the Vietnamese invasion of Cambodia, and withdrew a month later to prewar positions. Skirmishes along the border would continue until November 1991.After the triumph of the Pathet Lao, an anti-communist insurgency in Laos lasted until most Hmong insurgents surrendered in 2007, though some resistance cells remained active for several years after. Thailand, which supported the Lao insurgents, as well as the anti-Vietnamese forces in the Third Indochina War, fought a few skirmishes with Vietnam in 1984, and a short conflict with Laos in 1987.FULRO insurgency in Vietnam – United Front for the Liberation of Oppressed RacesThe Communist Party of Thailand fought an insurgency from 1965 to 1989. They received backing from Laos and Vietnam from 1975 to 1979 but were expelled from their bases and lost most of their supply lines after they sided with the Cambodian-Chinese aligned forces, rather than the pro-Soviet Vietnamese and Laotian regimes.

The August Revolution, also known as the August General Uprising, was a revolution launched by the Việt Minh against the Empire of Vietnam and the Empire of Japan in the latter half of August 1945. The Việt Minh, led by the Indochinese Communist Party, was created in 1941 and designed to appeal to a wider population than what the communists could command.