Clan Donald, also known as Clan MacDonald (sometime abbreviated to McDonald) (Scottish Gaelic: Clann Dòmhnaill; Mac Dòmhnaill [ˈkʰl̪ˠãũn̪ˠ ˈt̪õː.ɪʎ]), is a Highland Scottish clan and one of the largest Scottish clans. Historically the chiefs of the Clan Donald held the title of Lord of the Isles until 1493 and two of those chiefs also held the title of Earl of Ross until 1476.
The Lord Lyon King of Arms, the Scottish official with responsibility for regulating heraldry in that country, issuing new grants of coats of arms, and serving as the judge of the Court of the Lord Lyon, recognises under Scottish law the High Chief of Clan Donald. There are also numerous branches to the Clan Donald and several of these have chiefs recognised by the Lord Lyon King of Arms; these are: Clan Macdonald of Sleat, Clan Macdonald of Clanranald, Clan MacDonald of Keppoch, Clan MacDonald of Glencoe, Clan MacDonell of Glengarry, and Clan MacAlister.