The 27-year-old royal made a four-day trek to the North Pole with members of the Walking with the Wounded organization last April and was expected to reunite with them to scale Everest this May.
"He won't be going to the Himalayas because of his military commitments. Naturally, he is very disappointed that he won't be able to join the Walking with the Wounded team," Harry's representative told The Daily Telegraph.
Among his other upcoming engagements are his grandmother's Diamond Jubilee celebration, the London Olympics and his first official solo tour of Jamaica, Belize and the Bahamas, the Telegraph said.
Notable deaths of 2014 [PHOTOS]