Earl of Merioneth was a title in the Peerage of the United Kingdom created in 1947 along with the Duke of Edinburgh and the Baron Greenwich for Philip Mountbatten, later Prince Philip, upon his marriage to Princess Elizabeth, later Queen Elizabeth II.
Merionethshire is one of thirteen historic counties of Wales, a vice county and a former administrative county.
| Prince Philip<br/>Mountbatten<br/>1947âÂÂ2021<br/><small>also: Duke of Edinburgh and Baron Greenwich (1947)</small> | | 10 June 1921<br/>Mon Repos, Corfu<br/>son of Prince Andrew of Greece and Denmark and Princess Alice of Battenberg | Princess Elizabeth<br/>20 November 1947<br/>4 children | 9 April 2021<br>Windsor Castle, Windsor<br>aged 99 |- | Prince Charles <br/>House of Windsor<br/>2021âÂÂ2022<br/><small>also: Prince of Wales and Earl of Chester (1958), Duke of Cornwall, Duke of Rothesay (1952), Duke of Edinburgh and Baron Greenwich (2021)</small> | | 14 November 1948<br/>Buckingham Palace, London<br/>son of Prince Philip and Queen Elizabeth II | Lady Diana Spencer<br/>29 July 198128 August 1996<br/>2 children<br />Camilla Parker Bowles<br/>9 April 2005 | <br> now old |- | colspan=5|Prince Charles succeeded as Charles III in 2022 upon his mother's death, and his hereditary titles merged in the Crown.