Clan MacDonald of Keppoch, also known as Clan MacDonell of Keppoch or Clan Ranald of Lochaber (Scottish Gaelic: Clann Dòmhnaill na Ceapaich [ˈkʰl̪ˠãũn̪ˠ ˈt̪õː.ɪʎ nə ˈkʲʰɛʰpɪç]), is a Highland Scottish clan and a branch of Clan Donald. The progenitor of the clan is Alistair Carrach MacDonald, 4th great-grandson of the warrior Somerled. The clan chief is traditionally designated as the "Son of Ranald's son" (Scottish Gaelic: Mac Mhic Raonuill).
Clan MacDonald of Keppoch has a chief that is recognized by the Court of the Lord Lyon, and the Lord Lyon King of Arms, who is the heraldic authority in Scotland.