The President and the Taoiseach are among those attending the annual commemoration to mark the anniversary of the 1916 Easter Rising which is taking place on O'Connell Street in Dublin.
During the service there will be prayers of remembrance, a reading of the Proclamation and the laying of a wreath by the President.
More than 200 members of the Defence Forces and the Combined Army Band and Pipe Band will also take part in the ceremony.
Watch the ceremony live here.
