thumb|right|King Charles III in 2024
Charles III has received numerous titles, decorations, and honorary appointments, as a member of the British royal family, as heir apparent to Elizabeth II, and as King of the United Kingdom and the 14 other Commonwealth realms.
Royal and noble titles and styles
Charles was originally styled as "His Royal Highness Prince Charles of Edinburgh" per letters patent issued by his grandfather George VI.
Upon the accession of his mother as queen, as the eldest son of the monarch, Charles automatically became, in England, the Duke of Cornwall and, in Scotland, the Duke of Rothesay, Earl of Carrick, Baron of Renfrew, Lord of the Isles, and Prince and Great Steward of Scotland. As such, he was styled "His Royal Highness The Duke of Cornwall", except in Scotland, where he was known as "His Royal Highness The Duke of Rothesay" instead.
In 1958, letters patent from the then sovereign made Charles the Prince of Wales and Earl of Chester and, on 1 July 1969, he was invested as such during a ceremony in which a coronet and robes were placed on him. In 2021, upon the death of his father, Prince Philip, Charles furthermore inherited the titles Duke of Edinburgh, Earl of Merioneth, and Baron Greenwich. When he became the British sovereign himself on 8 September 2022, these titles merged with the Crown.
{| class="wikitable sortable" style="margin:0.5em 1em 0.5em 0; border:1px #005566 solid; border-collapse:collapse;"
|+Titles as Prince Charles
! rowspan=2 | Title !! colspan=2 | From !! colspan=2 | To
|-
! Date !! Reason !! Date !! Reason
|-
|Duke of Cornwall
| rowspan=6|6 February 1952
| rowspan=6|His mother's accession (automatically)
| rowspan=11|8 September 2022
| rowspan=6|Acceded as Charles III (titles transferred to the new heir apparent)
|-
|Duke of Rothesay
|-
|Earl of Carrick
|-
|Baron of Renfrew
|-
|Lord of the Isles
|-
|Prince and Great Steward of Scotland
|-
|Prince of Wales
| rowspan=2|26 July 1958
| rowspan=2|Granted to the heir apparent
| rowspan=5|Acceded as Charles III (titles merged with the Crown)
|-
|Earl of Chester
|-
|Duke of Edinburgh
| rowspan=3|9 April 2021
| rowspan=3|Death of his father (inherited)
|-
|Earl of Merioneth
|-
|Baron Greenwich
|}