Act of Union
Act of Union stands for:
- Act of Union 1536–1542, an obsolete term for the incorporation of Wales into the legal area of England, see Acts Incorporating Wales 1535–1542
- Act of Union 1707 , a legal agreement between England and Scotland
- Act of Union 1800 , a legal agreement between Great Britain and Ireland
- Act of Union 1840 , a United Kingdom law creating the Province of Canada , which includes the unification of Lower and Upper Canada