3 April – There was all-party support for the Criminal Justice Bill to abolish capital punishment for all offences and to replace it with lengthy prison sentences (although in practice the penalty for murder has always been commuted in Ireland since 1954).
26 April – The Labour Party selected Mary Robinson as its candidate for the November presidential election.
17 June – Ireland's World Cup continued with a goalless draw against Egypt.
20 June – The Irish Pound coin was introduced into circulation to replace the note of the same denomination.
21 June – The Irish football team completed their World Cup group stage unbeaten and reached the last 16 group with a 1–1 draw against the Netherlands.
25 June – Ireland reached the World Cup quarter-finals by beating Romania on penalties after a goalless draw in the last 16 tie, in Genoa. As of 2022, this was Ireland's best World Cup result
1 July – Half a million people gathered in Dublin to pay tribute to the Irish football team and to former South African President, Nelson Mandela. The football team had reached the World Cup quarter final in Italia '90 before being beaten by Italy, while Mandela accepted the Freedom of the City of Dublin, granted to him two years earlier, at an open-air ceremony outside the Mansion House.[1]
2 July – Nelson Mandela addressed a joint session of both houses of the Oireachtas.
11 July – The Criminal Justice Act abolished capital punishment for all offences and replaced it with lengthy prison sentences.[2]
24 August – Brian Keenan was released after 1,574 days in captivity in Beirut.
September – Janet Catterall became the first woman in Ireland to be ordained as a priest in the Church of Ireland.[3]
28 September – The centenary of People's Park in Dún Laoghaire, was celebrated.
24 October – The IRA killed six soldiers and a civilian in proxy bomb attacks in Derry and Newry.
25 October – Presidential candidate Brian Lenihan denied that he tried to contact President Hillery to stop the dissolution of the Dáil in 1982. This was in spite of a taped interview where he confirmed that he did.
31 October – Tánaiste and Minister for Defence Brian Lenihan was dismissed from the government over the 1982 Hillery telephone call controversy.
Irish Times (2 July 1990). "Heroes' welcome for team: Streets lined by at least 500,000 joyful fans". The Irish Times. Dublin.
Irish Press (2 July 1990). "Thanks, lads! 500,000 fans cheer Jack and his heroes". Irish Press. Dublin.
Dunphy, Eamon (7 October 2013). The Rocky Road. Penguin Ireland. ISBN9781844883325. Our plane landed at Dublin one hour before the team's. Flying in over the city we could see the vast crowd, an estimated 500,000, gathered for the homecoming party.