Act of Union

Act of Union may refer to:

In Britain and Ireland

• Laws in Wales Acts 1535–1542, passed by the Parliament of England, annexing Wales to England, sometimes known as the "Acts of Union"
• Tender of Union (Act of Union 1652), 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
• Acts 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

In the British Empire

• 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, the Union between Sweden and Norway, forming a personal union between Sweden and Norway
• Danish–Icelandic Act of Union, a 1918 union granting independence to Iceland

Other uses

• Act of Union, a poem by Seamus Heaney, written in 1975
• Laetentur Caeli, a 1439 papal bull sometimes referred to as the Act of Union