Taoiseach Enda Kenny has laid a wreath of green laurels at the war memorial in Enniskillen, County Fermanagh, to mark Remembrance Sunday.
The war memorial is the site of the 1987 IRA bomb which killed 11 people.
The North's first Minister Peter Robinson was among those laying wreaths at the Cenotaph in Belfast City Hall.
Tánaiste Eamon Gilmore was also at the Belfast ceremony,
Services are taking place across the UK to remember those killed in the two world wars and other conflicts.