February 15 - Decimalisation: The Republic of Ireland and United Kingdom both switch to decimal currency.
March 20 - Maj. James Chichester-Clark resigns as Prime Minister of Northern Ireland. He is succeeded on March 23 by Brian Faulkner.
April 3 - The Eurovision Song Contest is held in Dublin. Presented by Bernadette NÃ GhallchÃ³ir, it is the first colour broadcast by RTÃ‰.
April 11 - Ten British Army soldiers are injured in rioting in Derry.
The Gaelic Athletic Association votes to lift its ban on members participating in "foreign games" such as soccer, rugby and cricket.
April 20 - Two British Royal Navy survey launches moored off Baltimore, County Cork, are towed out to sea and bombed by a Provisional Irish Republican Army unit, one, the Stork, being wrecked.
May 11 - SeÃ¡n Lemass, Taoiseach from 1959 to 1966, dies in Dublin aged 71. He was active during the 1916 Easter Rising, the War of Independence and the Civil War.
May 22 - Members of the Irish Women's Liberation Movement return to Dublin on the "Contraceptive Train" from Belfast bringing contraceptives as a protest against the law banning their importation.
July 8 - Two rioters are shot dead by British troops in Derry.
July 16 - The Social Democratic and Labour Party (SDLP) announces that it is withdrawing from Stormont.
August 9 - Internment without trial is introduced in Northern Ireland. Over 300 republicans are 'lifted' in pre-dawn raids by British security forces and interned in Long Kesh prison. Some Loyalists are later arrested. Twenty people die in riots that follow, including eleven in the Ballymurphy Massacre.
August 12 - British troops begin clearing operations in Belfast following the worst rioting in years. Taoiseach Jack Lynch calls for an end to the Stormont administration.
September 7 - The death toll in The Troubles reaches 100 after three years with the death of 14-year-old Annette McGavigan, who is fatally wounded by a gunshot in crossfire between British soldiers and the IRA.
September 25 - A rally takes place in Dublin in support of a campaign of civil disobedience in Northern Ireland.
September 27 - Prime ministers Edward Heath, Jack Lynch and Brian Faulkner meet at Chequers to discuss the Northern Ireland situation.
October 13 - The British Army begins to destroy roads between the Republic of Ireland and Northern Ireland as a security measure.
October 23 - Two women are shot dead by soldiers in Belfast as their car fails to stop at a checkpoint.
October 31 - An IRA bomb explodes at the top of the Post Office Tower in London.
The Standard Time (Amendment) Act, 1971 reverses the main provision of the Standard Time Act 1968, returning Irish winter time to UTC+0 (Western European Time).
November 10 - The government defeats a motion of no confidence in Jim Gibbons.
November 17 - Neil Blaney and Paudge Brennan are expelled from the Fianna FÃ¡il parliamentary party.
December 4 - The McGurk's Bar bombing, carried out by the Ulster Volunteer Force in Belfast, kills 15 people, the highest death toll from a single incident in the city during "the Troubles".