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The Union Flag, commonly also known as the Union Jack, is the flag of the United Kingdom, as well as a flag with an official or semi-official status in some Commonwealth realms; for example, it is known by law in Canada as the Royal Union Flag. It is also used as an official flag in some of the smaller British overseas territories. The Union Flag also appears in the canton (upper left-hand quarter) of the flags of several nations and territories that were former British colonies.

The origins of the flag date back to 1603, when James VI of Scotland inherited the English and Irish thrones (as James I), thereby uniting the crowns of England, Scotland and Ireland in a personal union (which remained separate states). On 12 April 1606, a new flag to represent this regal union between England and Scotland was specified in a royal decree, according to which the flag of England (a red cross on a white background, known as St George's Cross), and the flag of Scotland (a white saltire on a blue background, known as the Saltire or St Andrew's Cross), would be joined together, forming the flag of Great Britain and first union flag.

The current design dates from the Union of Great Britain and Ireland in 1801. The flag combines aspects of three national flags: the red cross of Saint George, the red saltire of Saint Patrick's Flag, and the Flag of Scotland.