Ireland's Ambassador to Great Britain Dan Mulhall will lay a wreath at London's Cenotaph Remembrance Sunday ceremonies in November, it has been announced.
It will be the first time that an invitation has been issued and accepted and coincides with the centenary of the outbreak of World War I.
Mr Mulhall's predecessor as ambassador to Britain, Bobby McDonagh, had previously attended Remembrance Sunday ceremonies, while Taoiseach Enda Kenny laid wreaths in Enniskillen in November 2012 and 2013.
Tánaiste at the time, Eamon Gilmore, did likewise for the past two years at the Cenotaph in Belfast.
This new gesture by an Irish Ambassador will honour the memory of the thousands of Irish men and women who fought and died in World War I.
It is expected a similar invitation will be issued in future years.
Minister for Foreign Affairs Charlie Flanagan said the event marks one of many important centenaries in Ireland and Britain's shared history.
"One hundred years on from the start of the First World War, a war that claimed more Irish lives than any other war, I welcome the invitation for Ireland to take part in this annual wreath-laying ceremony at the Cenotaph to commemorate all those who died," he said.
"Our participation in this solemn occasion will be an opportunity to reflect on and remember the thousands of men from the island of Ireland who, for many different reasons, left their homes and families to fight in the First World War and never returned."