Act of Union may be an act that refers to:

In the United Kingdom:

• Laws in Wales Acts 1535-1542, passed by the Parliament of England, annexing Wales to the Kingdom of England are sometimes known as the "Acts of Union"
• Acts of Union 1707, passed by both the Parliament of England and the Parliament of Scotland to form the Kingdom of Great Britain.
• Act of Union 1800, passed by both the Parliament of Great Britain and the Parliament of Ireland to form the United Kingdom of Great Britain and Ireland.
• Act of Union 1840, passed by the Parliament of the United Kingdom, joining Upper Canada and Lower Canada (to form the Province of Canada).

In Scandinavia:

• Act of Union 1814 forming a personal union between Sweden and Norway

Other meanings

• An agreement between the Presbyterian and Congregationalist churches, within the United States
• The term "act of union" is also used as a euphemism for sexual intercourse

English laws | History of England | History of Ireland | History of Quebec | History of Wales | History of Scotland | History of the United Kingdom | Scottish laws | Constitutional laws of the United Kingdom

Acta de Unión | Acte d'Union | Acht an Aontais | 합병령 | Atto di Unione | 連合法 | Acto de União