Clan MacAulay has three distinct branches.
They are the MacAulay's of Ardencaple, the MacAulay's of Lochbroom and Coigach, and the MacAulay's of Lewis.

There are three provenances for the surname, one that it comes from Clan Alpen, from which also descends Clan Macgregor; the second is that the MacAuleys originate from a branch of the earldom of Lennox. Duncan filius Auleth witnessed a Charter by Malcolm, Earl of Lennox in c.1285, and for the following three centuries the family are on record as being principal vassals of the Lennox earldom.

The pages below give an interesting insight into the role that Clan MacAulay played in Scottish history. More recent articles tell the story of Iain MacMillan MacAulay's revival of the clan which had disintegrated more than 200 years ago and how the Clan went about electing a new Chief.