Dublin Castle and the Department of Foreign Affairs headquarters will be lit up in blue light this weekend, to mark the anniversary of the United Nations.
Landmarks around the world will be lit up in the UN's official colour of blue to mark the intergovernmental organisation's 70th anniversary.
The United Nations was set up on this day in 1945, and replaced the League of Nations.
The British Houses of Parliament, the Sydney Opera House and the Leaning Tower of Pisa are among the other iconic landmarks being lit up in blue to mark the milestone.
The wave of blue started in New Zealand and will move across the globe as dusk falls.
In a message to mark UN Day, the organisation's Secretary-General Ban Ki-moon said, "the United Nations works for the entire human family of seven billion people, and cares for the earth, our one and only home. And it is the diverse and talented staff of the United Nations who help bring the Charter to life.
"The 70th anniversary is a moment to recognize their dedication – and to honour the many who made the ultimate sacrifice in the line of duty. The world faces many crises, and the limits of collective international action are painfully clear. Yet no single country or organization can address today’s challenges alone," he added.
