Leaders around the world are expressing their condolences and paying homage to Queen Elizabeth's legacy.
Prime Minister Justin Trudeau of Canada, the largest country in the Commonwealth, said the Queen's service to Canadians will remain an important part of their history.
He said, "In a complicated world, her steady grace and resolve brought comfort and strength to us all."
US President Joe Biden and First Lady Jill Biden also sent their condolences to the Royal Family.
They recalled how she charmed them with her wit, moved them with her kindness and generously shared her wisdom.
President Biden said, "I had the opportunity to meet her before she passed and she was an incredibly gracious and decent woman. Our thoughts and prayers of the American people are with the people in the United Kingdom and the Commonwealth in their grief."
Japanese Prime Minister Kishida Fumio also expressed his condolences.
Kishida said, "This is a huge loss not only for the British people, but also for the international community. Japan will be with the people of Britain in overcoming this deep sorrow."
Members of the public will have a chance to pay their respects in London.
Officials are already finalizing plans for a state funeral, within two weeks, at Westminster Abbey.