
French Indochina, officially known as the Indochinese Union from 1887 and the Indochinese Federation after 1947, was a grouping of French colonial territories in Southeast Asia until its demise in 1954. It comprised Cambodia, Laos, the Chinese territory of Guangzhouwan, and the Vietnamese regions of Tonkin in the north, Annam in the centre, and Cochinchina in the south. The capital for most of its history (1902–45) was Hanoi; Saigon was the capital from 1887 to 1902 and again from 1945 to 1954.

The 1916 Cochinchina uprising was a series of defiant protests and attempted revolts in February against the French authority of southern Vietnam, which had been the colony of Cochinchina since 1862.

1940—1946 in French Indochina focuses on events that happened in French Indochina during and after World War II and which influenced the eventual decision for military intervention by the United States in the Vietnam War. French Indochina in the 1940s was divided into five protectorates: Cambodia, Laos, Tonkin, Annam, and Cochinchina. The latter three made up Vietnam. In 1940, the French controlled 23 million Vietnamese with 12,000 French soldiers, about 40,000 Vietnamese soldiers, and the Sûreté, a powerful police force. At that time, the U.S. had little interest in Vietnam or French Indochina as a whole. Fewer than 100 Americans, mostly missionaries, lived in Vietnam and U.S. government representation consisted of one consul resident in Saigon.

1947–1950 in French Indochina focuses on events influencing the eventual decision for military intervention by the United States in the First Indochina War. In 1947, France still ruled Indochina as a colonial power, conceding little real political power to Vietnamese nationalists. French Indochina was divided into five protectorates: Cambodia, Laos, Tonkin, Annam, and Cochinchina. The latter three made up Vietnam.

The Geneva Conference, intended to settle outstanding issues resulting from the Korean War and the First Indochina War, was a conference involving several nations that took place in Geneva, Switzerland, from April 26 to July 20, 1954. The part of the conference on the Korean question ended without adopting any declarations or proposals, so is generally considered less relevant. The Geneva Accords that dealt with the dismantling of French Indochina proved to have long-lasting repercussions, however. The crumbling of the French Empire in Southeast Asia led to the formation of the states of the Democratic Republic of Vietnam, the State of Vietnam, the Kingdom of Cambodia and the Kingdom of Laos.

Annam, or Trung Kỳ (中圻), was a French protectorate encompassing Central Vietnam. Before the protectorate's establishment, the name Annam was used in the West to refer to Vietnam as a whole; Vietnamese people were referred to as Annamites. The protectorate of Annam became a part of French Indochina in 1887, along with two other Vietnamese regions, Cochinchina in the South and Tonkin in the North. The region had a dual system of French and Vietnamese administration. The Nguyễn Dynasty still nominally ruled Annam, with a puppet emperor residing in Huế. In 1948, the protectorate was merged in the Provisional Central Government of Vietnam, which was replaced the next year by the newly established State of Vietnam. The region was divided between communist North Vietnam and anti-communist South Vietnam under the terms of the Geneva Accord of 1954.

Between 1878 and 1885, the Cochinchina piastre was the currency of the French colony of Cochinchina. It was replaced by the French Indochinese piastre after the creation of a unified administration for Cochinchina and the other French protectorates and colonies in the Far East on 22 December 1885.

The First Indochina War began in French Indochina on December 19, 1946, and lasted until July 20, 1954. Fighting between French forces and their Việt Minh opponents in the south dated from September 1945. The conflict pitted a range of forces, including the French Union's French Far East Expeditionary Corps, led by the government of France and supported by the former emperor Bảo Đại's Vietnamese National Army against the People's Army of Vietnam and Việt Minh, led by Võ Nguyên Giáp and Hồ Chí Minh. Most of the fighting took place in Tonkin in northern Vietnam, although the conflict engulfed the entire country and also extended into the neighboring French Indochina protectorates of Laos and Cambodia.

French Cochinchina was a colony of French Indochina, encompassing the whole region of Lower Cochinchina or Southern Vietnam from 1862 to early 1945. In 1946, it was established as the Autonomous Republic of Cochinchina, a controversial decision that helped trigger the First Indochina War. In 1948, the autonomous republic, whose legal status had never been formalized, was renamed as the Provisional Government of Southern Vietnam, not to be confused with the 1969–76 Viet Cong government. It was reunited with the rest of Vietnam in 1949.

The French protectorate of Laos was a French protectorate in Southeast Asia of what is today Laos between 1893 and 1953—with a brief interregnum as a Japanese puppet state in 1945—which constituted part of French Indochina. It was established over the Siamese vassal, the Kingdom of Luang Phrabang, following the Franco-Siamese War in 1893. It was integrated into French Indochina and in the following years further Siamese vassals, the Principality of Phuan and Kingdom of Champasak, were annexed into it in 1899 and 1904, respectively.

The French Union (1946–1958) was a political entity created by the French Fourth Republic to replace the old French colonial empire system, colloquially known as the "French Empire". It was the formal end of the "indigenous" status of French subjects in colonial areas.

The Haiphong Incident or the Haiphong Massacre occurred on November 23, 1946, when the French cruiser Suffren bombarded the Vietnamese coastal city of Haiphong, killing some 6,000 Vietnamese people. The incident, also known as the Shelling of Haiphong, is thought of as the first armed clash in a series of events that would lead to the Battle of Hanoi on December 19, 1946, and with it the official outbreak of the First Indochina War.

The Poisoning at Hanoi Citadel was a poisoning plot which occurred in 1908 when a group of Vietnamese indigenous tirailleurs attempted to poison the entire French colonial army's garrison in the Citadel of Hanoi. The aim of the plot was to neutralize the French garrison and make way for Hoang Hoa Tham's rebel army to capture Hanoi. The plot was disclosed, and then was suppressed by the French.

Thành Hưng Hóa was a fort and settlement in present-day Phú Thọ Province, northern Vietnam. The capture of Hưng Hóa in 1884 was an important French victory in the Tonkin Campaign.

The Code de l'indigénat, called régime de l'indigénat or simply indigénat by modern French historians, were diverse and fluctuating sets of laws and regulations characterized by arbitrariness which created in practice an inferior legal status for natives of French colonies from 1881 until 1944–1947.

The Japanese invasion of French Indochina was a short undeclared military confrontation between Japan and France in northern French Indochina. Fighting lasted from 22 to 26 September 1940, simultaneous with the Battle of South Guangxi in the Sino-Japanese War.

The Yunnan–Haiphong railway is an 855 km (531 mi) railway built by France during 1904–1910, connecting Haiphong, Vietnam, with Kunming, Yunnan province, China. The section within China from Kunming to Hekou is known as the Kunming–Hekou railway, and is 466 km long. The section within Vietnam is 389 km (242 mi) long, and is known as the Hanoi–Lào Cai railway. The railway was built with 1,000 mm gauge due to the mountainous terrain along the route. Currently it is the only main line in China using 1,000 mm metre gauge.

The following is a list of flags of French Indochina from 18 February 1859 to 9 March 1945.

The Mekong expedition of 1866–1868, conceived and promoted by a group of French colonial officers and launched under the leadership of captain Ernest Doudard de Lagrée, was a naval exploration and scientific expedition of the Mekong River on behalf of the French colonial authorities of Cochinchina. Its primary objective, besides scientific documentation, mapping, and the mission civilisatrice, was an assessment of the river's navigability in order to link the delta region and the port of Saigon with the riches of southern China and upper Siam. Ambitions were to turn Saigon into a successful commercial center such as British controlled Shanghai at the mouth of the Yangtze River.

The Paris Colonial Exhibition was a six-month colonial exhibition held in Paris, France, in 1931 that attempted to display the diverse cultures and immense resources of France's colonial possessions.

The Geneva Conference, intended to settle outstanding issues resulting from the Korean War and the First Indochina War, was a conference involving several nations that took place in Geneva, Switzerland, from April 26 to July 20, 1954. The part of the conference on the Korean question ended without adopting any declarations or proposals, so is generally considered less relevant. The Geneva Accords that dealt with the dismantling of French Indochina proved to have long-lasting repercussions, however. The crumbling of the French Empire in Southeast Asia led to the formation of the states of the Democratic Republic of Vietnam, the State of Vietnam, the Kingdom of Cambodia and the Kingdom of Laos.

The piastre de commerce was the currency of French Indochina between 1885 and 1952. It was subdivided into 100 cent, each of 2~6 sapèque.

A concise postal history of French Annam protectorate and Tongking protectorate, former territories of colonial French Indochina, that were located in present-day Vietnam. Dates 1888 - 1892

The Thái Nguyên uprising in 1917 has been described as the "largest and most destructive" anti-French rebellion in Vietnam between the Pacification of Tonkin in the 1880s and the Nghe-Tinh Revolt of 1930–31. On 30 August 1917, an eclectic band of political prisoners, common criminals and insubordinate prison guards mutinied at the Thai Nguyen Penitentiary, the largest one in the region. The rebels came from over thirty provinces and according to estimates, involved at some point roughly 300 civilians, 200 ex-prisoners and 130 prison guards.

The Tirailleurs indochinois were soldiers of several regiments of local ethnic Indochinese infantry organized as Tirailleurs by the French colonial authorities, initially in Vietnam from 15 March 1880. The most notable, and first established, of these units were the Tonkinese Rifles.

Tonkin, or Bắc Kỳ (北圻), was a French protectorate encompassing modern Northern Vietnam. Like the French protectorate of Annam, Tonkin was still nominally ruled by the Nguyễn dynasty but in 1886 the French separated Tonkin from the Nguyễn imperial court in Huế by establishing the office of "Viceroy". However, on 26 July 1897 the position of Viceroy was abolished officially making the French Resident-Superior of Tonkin both the representative of the French colonial administration and the Nguyễn dynasty court in Huế giving him the power to appoint local mandarins. In 1887 Tonkin became a part of the Union of Indochina.

The Tonkin Affair, named after the French protectorate of Tonkin, of March 1885 was a major French political crisis that erupted in the closing weeks of the Sino-French War. It effectively destroyed the political career of the French prime minister, Jules Ferry, and abruptly ended the string of Republican governments inaugurated several years earlier by Léon Gambetta. The suspicion by the French public and political classes that French troops were being sent to their deaths far from home for little measurable gain, both in Tonkin and elsewhere, also discredited French colonial expansion for nearly a decade.

The Tonkin campaign was an armed conflict fought between June 1883 and April 1886 by the French against, variously, the Vietnamese, Liu Yongfu's Black Flag Army and the Chinese Guangxi and Yunnan armies to occupy Tonkin and entrench a French protectorate there. The campaign, complicated in August 1884 by the outbreak of the Sino-French War and in July 1885 by the Cần Vương nationalist uprising in Annam, which required the diversion of large numbers of French troops, was conducted by the Tonkin Expeditionary Corps, supported by the gunboats of the Tonkin Flotilla. The campaign officially ended in April 1886, when the expeditionary corps was reduced in size to a division of occupation, but Tonkin was not effectively pacified until 1896.

At the outbreak of World War I, Vietnam was under French protectorate and part of French Indochina. While seeking to maximize the use of Indochina's natural resources and manpower to fight the war, France cracked down all patriotic movements in Vietnam. As the country remained a member of the French Empire, many Vietnamese fought later in the conflict.

The Yên Bái mutiny was an uprising of Vietnamese soldiers in the French colonial army on 10 February 1930 in collaboration with civilian supporters who were members of the Việt Nam Quốc Dân Đảng.