Isabella of Lennox (died 1458) was the ruler of Lennox, at least from 1437 to 1458, and last in the line of Mormaers or native Scottish rulers. As the wife of Murdoch Stewart, 2nd Duke of Albany (died 1425), she was also Duchess of Albany (1420–1425), but in 1425 her family would be almost completely destroyed when her husband, father and two sons were executed by King James I of Scotland because of their rebellion. Only one son, James the Fat, would escape their family's punishment, and he would die in exile in Ireland. Isabella succeeded in escaping the fate of her family, and would eventually regain her title and estates, retiring to her castle in Loch Lomond where she raised her grandchildren. She would eventually live to see the assassination of her family's opponent, King James. Though none of her four sons survived her, her grandson Andrew Stewart, 1st Lord Avandale would in time rise to become Lord Chancellor of Scotland.