The United Kingdom of Great Britain and Northern Ireland (1927–present)

The United Kingdom of Sweden-Norway (1814–1905)

The United Kingdom is also a name for the ancient Israelite Kingdom of King David and his son Solomon—more commonly termed the United Monarchy.

The United Kingdom of Great Britain and Ireland (1801–1927)

The Kalmar Union which united the kingdoms of Norway, Sweden and Denmark (1397–1520)

The United Kingdom of Libya (1951–1969)

The Kingdom of Great Britain (1707–1801) or the United Kingdom of Great Britain

The United Kingdom of Denmark-Norway (1536–1814)

The United Kingdom of Portugal, Brazil, and the Algarve (1815–1822, though formally disbanded in 1825);

The United Kingdom of the Netherlands (1815–1830, though formally disbanded in 1839);

See also Political union and Personal union.