1971 in Northern Ireland
- 6 February - Gunner Robert Curtis becomes the first British Army soldier to be killed in The Troubles.
- 15 February - Decimal Day: The United Kingdom and Republic of Ireland both switch to decimal currency.
- 10 March - 1971 Scottish soldiers' killings: Three young off-duty Royal Highland Fusiliers are lured from a bar in Belfast and shot by the Provisional Irish Republican Army.
- 20 March - Maj. James Chichester-Clark resigns as Prime Minister of Northern Ireland. He is succeeded on 23 March by Brian Faulkner.
- 16 July - The Social Democratic and Labour Party (SDLP) announces that it is withdrawing from the Parliament of Northern Ireland.
- 9 August - Internment without trial is introduced in Northern Ireland. In Operation Demetrius, over 300 republicans are 'lifted' in pre-dawn raids. Some loyalists are later arrested.
- 12 August - British troops begin clearing operations in Belfast following the worst rioting in years. Taoiseach Jack Lynch calls for an end to the Stormont administration.
- 27 September - Prime ministers Edward Heath, Jack Lynch and Brian Faulkner meet at Chequers to discuss the Northern Ireland situation.
- 30 October - The Democratic Unionist Party is founded by the Rev. Ian Paisley.
- 19 November - Taoiseach Jack Lynch has talks with Prime Minister of the United Kingdom Harold Wilson in Dublin.
- 4 December - The McGurk's Bar bombing, carried out by the Ulster Volunteer Force in Belfast, kills fifteen people, the highest death toll from a single incident in the city during The Troubles.
Arts and literature
- 5 March - Ulster Hall, Belfast, becomes the first place in which Led Zeppelin play their iconic song "Stairway to Heaven".
- Paul Muldoon publishes his first poetry collection Knowing My Place.
- Frank Ormsby publishes his first poetry collection Ripe for Company.
- Blackstaff Press established in Belfast.
- Winners: Linfield
- 31 January - Patrick Kielty, comedian and television presenter.
- 1 February - Alan Fettis, footballer.
- 5 June - Susan Lynch, actress.
- 25 June - Neil Lennon, footballer.
- 13 July - Eamonn Magee, boxer.
- 2 August - Michael Hughes, footballer.
- 2 August - Anthony Tohill, Gaelic footballer.
- 10 September - David Humphreys, Irish international rugby union footballer.
- 12 December - Naomi Long, Alliance Party MLA.
Full date unknown
- 24 January - St. John Greer Ervine, dramatist and author (born 1883).
- 15 May - Billy Reid, volunteer in Provisional Irish Republican Army, killed in gunfight with British Army (born 1939).
- 14 June - Gerard Dillon, artist (born 1916).
- 27 July - Charlie Tully, footballer (born 1924).