Mountjoy Prison helicopter escape. Three Provisional Irish Republican Army members escape from Mountjoy Prison, Dublin aboard a hijacked helicopter that landed in the exercise yard.

The Mountjoy Prison helicopter escape occurred on 31 October 1973 when three Provisional Irish Republican Army (IRA) volunteers escaped from Mountjoy Prison in Dublin, Ireland, by boarding a hijacked helicopter that briefly landed in the prison's exercise yard. The escape made headlines around the world and was an embarrassment to the Irish coalition government of the time, led by Fine Gael's Liam Cosgrave, which was criticised by opposition party Fianna Fáil. A manhunt involving twenty thousand members of the Irish Defence Forces and Garda Síochána was launched for the escapees, one of whom, Seamus Twomey, was not recaptured until December 1977.

The Provisional Irish Republican Army, officially known as the Irish Republican Army and informally known as the Provos, was an Irish republican paramilitary force that sought to end British rule in Northern Ireland, facilitate Irish reunification and bring about an independent republic encompassing all of Ireland. It was the most active republican paramilitary group during the Troubles. It argued that the all-island Irish Republic continued to exist, and it saw itself as that state's army, the sole legitimate successor to the original IRA from the Irish War of Independence. It was designated a terrorist organisation in the United Kingdom and an unlawful organisation in the Republic of Ireland, both of whose authority it rejected.

Mountjoy Prison, founded as Mountjoy Gaol and nicknamed The Joy, is a medium security men's prison located in Phibsborough in the centre of Dublin, Ireland. The current prison Governor is Ray Murtagh.

Dublin is the capital and largest city of Ireland. Situated on Dublin Bay at the mouth of the River Liffey, it is in the province of Leinster, and is bordered on the south by the Dublin Mountains, part of the Wicklow Mountains range. Dublin is the largest city by population on the island of Ireland; at the 2022 census, the city council area had a population of 592,713, while the city including suburbs had a population of 1,263,219, County Dublin had a population of 1,501,500. Various definitions of a metropolitan Greater Dublin Area exist.