4 July – The Dáil debated the Fethard-on-Sea Ne Temere boycott.
22 July – The Gough Monument in the Phoenix Park in Dublin was wrecked by an explosion so violent that it was heard all over the city.
7 August – A 20-foot high war memorial in Limerick was blown up. It was erected to commemorate British soldiers from Limerick who died in World War I.
30 September – Last day of operation of 97 miles (155 km) of railway in Northern Ireland (Great Northern Railway (GNR) branches and the entire Sligo, Leitrim and Northern Counties Railway) following government instructions. County Fermanagh lost all its lines. The GNR closed a further 84 miles (134 km) of connecting lines in the Republic on October 12.
10 October – The Windscale fire began with a fire in a graphite core of a reactor at the Windscale Nuclear Power station and reprocessing centre on the Cumberland coast of North West England. Years later there were claims that the radiation caused cancers and birth defects in County Louth.
27 October – The foundation stone of Galway Cathedral was blessed.
1 November – The Soviet satellite Sputnik was visible over Dublin for the second time in a month.
November – Border Campaign: The premature explosion of a bomb at a farmhouse in County Louth killed four IRA men and a householder.[1]
12 May – The Pike Theatre in Dublin staged the Tennessee Williams play The Rose Tattoo. During its short run the theatre was invaded by Gardaí (police) and director Alan Simpson was arrested for producing "a lewd entertainment" for a mime of dropping a condom onto the floor.[7]
The Bachelors musical group formed as The Harmonichords in Dublin.