The Kingdom of Britain may refer to:
- Kingdom of Great Britain (1707–1800)
- United Kingdom of Great Britain and Ireland (1801–1922)
- United Kingdom of Great Britain and Northern Ireland (1922–present)
See also
- Kingdom of Brittany
- King of the Britons
- List of legendary kings of Britain
- Terminology of the British Isles
- Monarchy of the United Kingdom
- Great Britain (disambiguation)
- Britain (disambiguation)
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