President Michael D Higgins and Taoiseach Leo Varadkar lead a ceremony to mark the National Day of Commemoration at the Royal Hospital in Kilmainham.
Events were also held in Cork, Galway, Limerick, Sligo, Kilkenny and Waterford.
Today's event was a multi-faith service of prayer and a military service.
It honoured all Irish people who died in past wars or on service with the United Nations.
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The President and Taoiseach were joined my members of Government, the judiciary, the Council of State, veterans' organisations and diplomats.
Relatives of those who have died in conflicts, including the 1916 Rising, also attended.
3,000 people were invited to the ceremony in Dublin, which was also open to the public.
At the conclusion of the service, there was an Air Corps flyover.