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Upon the Queen's death, her eldest son Charles, Prince of Wales, immediately acceded to the throne as King of the United Kingdom with the regnal name "Charles III".

There was some speculation regarding the regnal name that would be adopted by the former Prince of Wales upon succeeding his mother. During her formal televised address outside 10 Downing Street, Prime Minister Liz Truss made the first mention of the King's regnal name during a tribute to the Queen. Clarence House officially confirmed the new King would be known as Charles III shortly after the Prime Minister's address. Buckingham Palace released the King's first official statement as monarch at 19:04:

Most of Charles III's pre-accession Scottish titles, as well as the title Duke of Cornwall, were passed to his eldest son and the new heir apparent to the throne, Prince William, Duke of Cambridge. On 9 September, William was created Prince of Wales and Earl of Chester, succeeding his now-reigning father.

The Accession Council assembled on 10 September at St James's Palace to formally proclaim the accession of Charles III. Although about seven hundred people were eligible to attend the ceremony, because the event was planned on such short notice, the number in attendance was two hundred. In addition to other formalities, the Council de jure confirmed "Charles III" as the King's regnal name.

No dates have been announced yet for the coronation of Charles III and Camilla, or for the investiture of Prince William as the new Prince of Wales.