Alexander of Islay or Alexander MacDonald (died 1449; Scottish Gaelic: Alasdair MacDomhnaill Dòmhnallach or MacDhòmhnaill) was a medieval Scottish nobleman who succeeded his father Domhnall of Islay as Lord of the Isles (1423–1449) and rose to the rank of Earl of Ross (1437–49). His lively career especially before he attained the earldom of Ross led Hugh MacDonald the 17th century author of History of the MacDonalds to commemorate him as a man born to much trouble all his lifetime.
