WThe 2018 World Para Swimming European Championships, known for sponsorship reasons as the 2018 World Para Swimming Allianz European Championships took place in Dublin, Ireland from the 13th to the 19th of August, 2018. It was the 5th edition of the Championships, the first under the new World Para Swimming branding, and the first time Ireland had hosted. Ukraine topped the medal table for the fourth time in a row.
WThe 2018 Eisenhower Trophy took place 5–8 September at the Carton House Golf Club in Maynooth, County Kildare, Ireland. It was the 31st World Amateur Team Championship for the Eisenhower Trophy. The tournament was a 72-hole stroke play team event with 72 three-man teams. The best two scores for each round counted towards the team total. Each team played two rounds on the Montgomerie and O'Meara courses. The leading teams played the Montgomerie course on the third day and the O'Meara course on the final day.
WThe 2018 Espirito Santo Trophy took place 29 August – 1 September at Carton House Golf Club on its Montgomerie and O'Meara courses in Maynooth, County Kildare, Ireland.
WIreland competed at the 2018 European Athletics Championships in Berlin, Germany, from 6-12 August 2018.
WIreland is one of the nations competing at the inaugural 2018 European Championships in Berlin, Germany and Glasgow, United Kingdom, from 2 to 12 August 2018. Ireland is competing in 7 sports.
WIreland participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 October to 18 October 2018.
WIreland competed at the 2018 Winter Olympics in Pyeongchang, South Korea, from 9 to 25 February 2018. Five athletes represented the country in four sports. OCI Chief Executive Stephen Martin was chef de mission.
WThe 2018 UK & Ireland Greyhound Racing Year was the 93rd year of greyhound racing in the United Kingdom and Ireland.