Mary Stewart, Countess of Arran (13 May 1453 – May 1488) was the elder daughter of James II of Scotland and Mary of Guelders. Her brother was James III of Scotland. She married twice; firstly to Thomas Boyd, 1st Earl of Arran; secondly to James Hamilton, 1st Lord Hamilton. It was through her children by her second husband that the Hamilton Earls of Arran and Stewart Lennoxes derived their claim to the Kingdom of Scotland.