The Treaty of Haddington was a treaty signed in 1548 between France and Scotland that promised Mary, Queen of Scots to Dauphin Francis in marriage in return for French assistance in the Siege of Haddington and subsequent French influence in Scotland. Mary, only six years old at the time, subsequently went to live in France, eventually marrying the Dauphin, while her regents ruled in her name in Scotland.

Mary, Queen of Scots, also known as Mary Stuart or Mary I of Scotland, was Queen of Scotland from 14 December 1542 until her forced abdication in 1567.