All-Ireland organisations

Anglican church in Ireland

Protestant fraternal order originating in Northern Ireland

Roman Catholic Church in the island of Ireland, including Northern Ireland

public body responsible for the promotion of the Irish language

maritime rescue organization in the UK, Ireland, Channel Islands and Isle of Man

academy of sciences

Irish rugby union competition

organization

Presbyterian Christian theological movement originating in Ireland emphasizing individual conscience in matters of Christian faith.

youth wing of the Irish political party Sinn Féin

General Lighthouse Authority for Northern Ireland and the Republic of Ireland

annual Gaelic football competition between the senior county teams of Ireland plus London

all-Ireland body promoting Ulster-Scots

thumb|The Four Provinces Flag of Ireland contains the flags of Ireland's four traditional constituent provinces: (clockwise, from the top left) [[Munster, Connacht, Leinster, and Ulster]]

umbrella organization for trade unions