The Provisional Irish Republican Army (IRA) was a republican paramilitary organization formed in 1969 seeking to end British rule in Northern Ireland and achieve Irish reunification. It became the dominant armed group during the conflict known as the Troubles (late 1960s–1998) and was closely associated—though officially distinct—from the political party Sinn Féin.
The Provisional IRA emerged after a 1969 schism within the historic Irish Republican Army over how to respond to sectarian violence against Catholics and over abstention from political institutions. The “Provos,” as they were known, organized to defend nationalist areas and wage a guerrilla campaign against British forces, arguing that the older, Marxist-leaning Official IRA had failed to protect Catholic communities.
From 1970 onward, the group waged what it called the “Long War,” employing bombings, assassinations, and ambushes targeting British soldiers, police, and infrastructure. Major incidents included the 1979 attacks that killed Lord Mountbatten and 18 British soldiers at Warrenpoint. Violence by both republican and loyalist groups defined the Troubles, costing more than 3,500 lives by the mid-1990s.
The hunger strikes of 1981, during which ten republican prisoners died, transformed the movement’s strategy. Gerry Adams and Martin McGuinness advanced the “Armalite and ballot box” approach, pairing armed struggle with electoral politics through Sinn Féin. Negotiations with British and Irish governments led to the 1994 cease-fire and, ultimately, the 1998 Good Friday Agreement, which established power sharing in Northern Ireland.
Although initially resistant to full disarmament, the IRA completed verified weapons decommissioning by 2005 and declared its armed campaign over, pledging to pursue goals solely by peaceful means. Splinter groups such as the Real Irish Republican Army and the Continuity Irish Republican Army later rejected the peace settlement and continued sporadic violence. The Provisional IRA’s transition remains central to Northern Ireland’s peace and political landscape.