Hundreds of thousands of people have travelled to London and Windsor for the state funeral and burial service, which is being watched on television by millions around the world.
The Queen's coffin has arrived at Windsor Castle where she will be laid to rest beside her husband, as the nation bids farewell to Britain's longest reigning monarch.
Thousands of people lined the Long Walk and broke out in applause as the coffin was carried in a procession to the landmark.
A committal ceremony is taking place at St George's Chapel in the grounds of the castle followed by a private burial service attended by senior royals.
The Queen's final resting place will be the King George VI memorial chapel, an annex to the main chapel where her mother and father were buried, along with the ashes of her sister, Princess Margaret.
The coffin of the Queen's beloved husband, Prince Philip, will move from the royal vault to the memorial chapel to join her.
In a touching gesture, the late monarch's two faithful friends, her corgis Muick and Sandy, were part of the day and made an appearance outside St George's Chapel.
Around 800 people, including members of the Queen's Household and Windsor estate staff, attend the committal service.
Prior to the final hymn, the Imperial State Crown, the orb and the sceptre were removed from the Queen's coffin, and placed on the altar.
Earlier, the King led members of the Royal Family in a procession to Westminster Abbey for the Queen's state funeral, where world leaders were among the congregation at the hour-long service.
In a personal touch, the wreath adorning the Queen's coffin had a handwritten note written by the King, which read: "In loving and devoted memory. Charles R."