Hundreds of thousands of well-wishers flocked to London and lined the route through London to say their last goodbyes, while millions around the globe watched proceedings on TV.
The King and his siblings walked behind the coffin as it left Westminster Abbey following the state funeral, while other royals are travelling by car.
During the service, Charles was visibly moved and looked close to tears as the national anthem was sung in the Abbey.
Here are pictures from the historic event.
During the service, Charles was visibly moved and looked close to tears as the national anthem was sung in the Abbey.
9. State Funeral of Queen Elizabeth II
LONDON, ENGLAND - SEPTEMBER 19: Britain's King Charles III, Anne, Princess Royal, Prince Andrew, Duke of York, Vice Admiral Sir Timothy Laurence, Camilla, Queen Consort, Prince Edward, Earl of Wessex, Sophie, Countess of Wessex, William, Prince of Wales, Prince George of Wales, Princess Charlotte of Wales, Catherine, Princess of Wales, Prince Harry, Duke of Sussex, Meghan, Duchess of Sussex, Peter Phillips, David Armstrong-Jones, 2nd Earl of Snowdon, Prince Richard, Duke of Gloucester, Prince Michael of Kent and Prince Edward, Duke of Kent departing Westminster Abbey during the State Funeral of Queen Elizabeth II . (Photo by Gareth Cattermole/Getty Images) Photo: Gareth Cattermole