Here is everything we know about what will happen – and when – over the next few days.
The King and Queen meet members of the emergency services and attend a lunch for Commonwealth Governors General.
This evening, eight grandchildren - the Prince of Wales, Duke of Sussex, Princess Beatrice, Princess Eugenie, Peter Phillips, Zara Tindall, Lady Louise Mountbatten-Windsor and Viscount Severn - will form a own silent guard at the Queen's coffin in Westminister Hall for around 15 minutes.
The King and Queen Consort host heads of state and official overseas visitors in a state reception at Buckingham Palace.
Lying in state ends as doors of Westminster Hall are closed to the public.
Westminster Abbey opens for members of the congregation to start taking their seats.
Bearer party of Queen’s Company, 1st Bn Grenadier Guards lifts the coffin from the catafalque and places it on a state gun carriage first used for funeral of Queen Victoria.
Coffin, drawn by 142 Royal Naval Ratings, begins short journey to Westminster Abbey, with members of the Royal family following on foot.
Coffin arrives at West Gate of Westminster Abbey, where it is carried inside for the state funeral and placed on a catafalque.
Funeral service begins.
Last Post is sounded in Westminster Abbey, followed by national two minutes’ silence.
State funeral service ends with a lament played by the Queen’s piper.
Coffin procession leaves Westminster Abbey for Wellington Arch.
Coffin procession arrives at Wellington Arch, where the coffin will be placed in a state hearse to begin its journey to Windsor.
Hearse arrives at Shaw Farm Gate in Albert Road, Windsor, joining a procession already formed up and in position.
Procession steps off and proceeds up the Long Walk to Windsor Castle via the George IV Gate.
Governors general and prime ministers of the Commonwealth Realms take their seats in the nave.
Members of the Royal family not walking behind the coffin arrive and take their seats in the quire and the nave.
The King and other members of the Royal family join the procession on foot in the quadrangle of the castle.
Procession halts at the bottom of the West Steps of St George’s Chapel. Bearer party carries the coffin from the hearse and places it on a catafalque in the quire.
Televised committal service begins, conducted by the Dean of Windsor. At the end of the service, the coffin is lowered into the royal vault.
Private burial service is held in King George VI Memorial Chapel, attended by close family members. The Queen’s coffin, along with that of the Duke of Edinburgh, is moved from the royal vault to the chapel where it will be interred.