The Act of Union is a name given to several acts passed by the English, Scottish and British parliaments from 1536 onwards. Among those:
- 1536 Act of Union joining England and Wales
- 1707 Act of Union joining Scotland and England (the union of England and Wales)
- 1801 Act of Union joining Ireland and the Great Britain
- 1840 Act of Union joining Upper Canada and Lower Canada
The term "act of union" is also used as a euphemism for sexual intercourse.
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