Prince Harry will join forces with his grandfather Prince Philip to visit the Field of Remembrance at Westminster Abbey on 7 November.
"The Duke and Prince Harry will each lay a Cross of Remembrance in front of two wooden crosses from the Graves of Unknown British Soldiers from the First and Second World Wars," Buckingham Palace said in a statement.
"The 'Last Post' will sound followed by a two minutes' silence after which Their Royal Highnesses will visit the plots meeting veterans from past and more recent conflicts."
The two royals will be met by The Dean of Westminster, The Rector of St. Margaret’s Church and members of The Royal British Legion Poppy Factory three days before Remembrance Sunday.
The Field of Remembrance at Westminster is a long-standing engagement for the 92-year-old Duke of Edinburgh.
Prince Harry, an Apache co-pilot gunner, attended the opening of the Field of Remembrance in Wootton Bassett in 2010.