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".
• Act of Union 1652‎, (more commonly known as the Tender of Union), annexation of Scotland by the Commonwealth of England
• 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).
• South Africa Act 1909, passed by the Parliament of the United Kingdom creating the Union of South Africa, is sometimes referred to as the Act of Union.

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.
• The poem by Seamus Heaney, written in 1975.

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