All events · The War's Long Shadow

Jeju 4·3 Uprising and Suppression

c. 1948–1949 · East & Southeast Asia

Displacement Mass Killing Killing was the defining act

Displaced

20,000

No reliable count of the displaced exists. During the scorched-earth phase from mid-November 1948 residents of the mid-mountain villages were ordered to the coast and their villages burned; the flow figure here is indicative rather than measured, and later flight to Japan is undocumented in official sources.

Share of the population affected

7.1%

of the population of Jeju Island in 1948, 1948

Killed

14,373–30,000

direct killing

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What happened

On 3 April 1948 the Jeju branch of the South Korean Labor Party launched an armed uprising against planned separate elections in the south. The suppression that followed, carried out by police, army units and rightist paramilitary groups first under the US military government and then under the Republic of Korea, escalated in mid-November 1948 into a scorched-earth campaign in which mountain villages were burned and their inhabitants ordered to the coast. The government's National Committee for Investigation of the Truth about the Jeju 4·3 Incident put civilian deaths at 25,000 to 30,000, roughly a tenth of the island's population, with about 14,373 individual deaths registered; South Korea's Truth and Reconciliation Commission found that 86 per cent of reported deaths were caused by security forces, police and rightist groups. The state renamed the events from a 'rebellion' to an 'incident' and recognised the dead as civilians; the archives were inscribed on UNESCO's Memory of the World register in 2025. Parallel mass executions of detainees and Bodo League registrants elsewhere in South Korea in 1950 were investigated by the same commission.

Parties

South Korean police, army units and rightist youth groups, under the US military government and then the new Republic of Korea, suppressed an armed uprising on Jeju Island and destroyed and emptied its mid-mountain villages

Disputed

The total death toll (25,000-30,000 estimated against 14,373 individually registered), the extent of US military government responsibility, and whether the killings should be characterised as genocide remain disputed.

The denominator

Jeju's population at the time of the uprising is generally put at about 280,000-300,000, based on US Military Government and early Republic of Korea administrative counts. The 2003 report of South Korea's National Committee for the Investigation of the Truth about the Jeju April 3 Incident works from this order of magnitude in estimating that some 10 per cent of islanders died.

Where the baseline comes from

Jeju uprising — Wikipediaopen-edited
Jeju Province — Wikipediaopen-edited

On the death toll

The lower figure is the number of individual deaths registered with the government investigation committee; the upper figure is that committee's estimate of total civilian deaths. The gap reflects families who never reported deaths, often because association with the uprising carried a lasting political stigma.

Documented forms of violence

Mass KillingSummary ExecutionDestruction of Property

The scorched-earth burning of mountain villages and the mass killing of civilians are documented by the government's Jeju 4·3 investigation and by the Truth and Reconciliation Commission of Korea.

Formal findings

Truth and Reconciliation Commission of Korea (2010) — Found that 86 per cent of reported deaths were committed by security forces including the National Guard, the police and rightist groups, and that victims were civilians rather than insurgents — source