United Kingdom: Heads of State: 1801-2024All Heads of State in the following index are also Heads of State in other realms and territories. |
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| By the Grace of God, of the United Kingdom of Great Britain and Ireland King, Defender of the Faith | |
| 1 Jan 1801 - 29 Jan 1820 | George III [1] |
| 29 Jan 1820 - 26 Jun 1830 | George IV |
| 26 Jun 1830 - 20 Jun 1837 | William IV |
| By the Grace of God, of the United Kingdom of Great Britain and Ireland Queen, Defender of the Faith | |
| 20 Jun 1837 - 28 Apr 1876 | Victoria |
| By the Grace of God, of the United Kingdom of Great Britain and Ireland Queen, Defender of the Faith, Empress of India | |
| 28 Apr 1876 - 22 Jan 1901 | Victoria |
| By the Grace of God, of the United Kingdom of Great Britain and Ireland King, Defender of the Faith, Emperor of India | |
| 22 Jan 1901 - 4 Nov 1901 | Edward VII |
| By the Grace of God of the United Kingdom of Great Britain and Ireland and of the British Dominions beyond the Seas King, Defender of the Faith, Emperor of India | |
| 4 Nov 1901 - 6 May 1910 | Edward VII |
| 6 May 1910 - 13 May 1927 | George V |
| By the Grace of God of Great Britain, Ireland and the British Dominions beyond the Seas King, Defender of the Faith, Emperor of India | |
| 13 May 1927 - 20 Jan 1936 | George V |
| 20 Jan 1936 - 11 Dec 1936 | Edward VIII |
| 11 Dec 1936 - 22 Jun 1948 | George VI |
| By the Grace of God of Great Britain, Ireland and the British Dominions beyond the Seas King, Defender of the Faith | |
| 22 Jun 1948 - 6 Feb 1952 | George VI |
| By the Grace of God of Great Britain, Ireland and the British Dominions beyond the Seas Queen, Defender of the Faith | |
| 6 Feb 1952 - 29 May 1953 | Elizabeth II |
| By the Grace of God of the United Kingdom of Great Britain and Northern Ireland and of Her other Realms and Territories Queen, Head of the Commonwealth, Defender of the Faith | |
| 29 May 1953 - 8 Sep 2022 | Elizabeth II |
| By the Grace of God of the United Kingdom of Great Britain and Northern Ireland and of His other Realms and Territories King, Head of the Commonwealth, Defender of the Faith | |
| 8 Sep 2022 - | Charles III |
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| [1] | Regent of the United Kingdom of Great Britain and Ireland |
| 6 Feb 1811 - 29 Jan 1820 George Prince of Wales (= George IV) | |
Last update: 20 Feb 2024