A statement issued by the palace just after midday spoke of the Queen’s “deep sorrow” following his death at Windsor Castle on Friday morning.
The Duke of Edinburgh, the longest-serving royal consort in British history, was at the Queen’s side for more than her six decades of reign.
Prince Philip who died at 99 years was married to the Queen for 73 years.
“It is with deep sorrow that Her Majesty The Queen announces the death of her beloved husband,” Buckingham Palace said.
“The Royal Family join with people around the world in mourning his loss.”
British Prime Minister Boris Johnson said he “inspired the lives of countless young people”.
Speaking at Downing Street, the prime minister said that the duke had “earned the affection of generations here in the United Kingdom, across the Commonwealth, and around the world”.