Prince William will attend the New Zealand Commemoration for the Battle of Passchendaele on October 12, Kensington Palace has confirmed.
Prime Minister Bill English this morning welcomed the announcement.
The commemorations will take place at Tyne Cot Cemetery, near Zonnebeke in Belgium - the largest Commonwealth War Grave cemetery in the world.
"The Duke of Cambridge, representing HM The Queen, will attend the New Zealand Commemoration for the Battle of Passchendaele on 12th October," the Palace tweeted.
The cemetery contains 520 New Zealand graves and more Kiwi soldiers are listed on the New Zealand Memorial to the Missing in the Battles of Passchendaele.
The Prince will be joined by Princess Astrid of Belgium, who will attend on behalf of her brother, King Philippe.
"It is fitting that the Duke of Cambridge will be there to mark 100 years since the battle and to recognise an important part of New Zealand's story," English said.
"Passchendaele was the greatest disaster in New Zealand military history. Some 843 men are recorded as having lost their lives on 12 October 1917, the most on any single day of combat involving New Zealand troops.
"A century later we will remember the courage and sacrifice of those who fought and died and commemorate a significant chapter in our nation's history."