Clan MacAulay, also spelt Macaulay or Macauley is a Scottish clan. The clan was historically centred on the lands of Ardincaple, which are today consumed by the little village of Rhu and burgh of Helensburgh in Argyll and Bute. The MacAulays of Ardincaple were located mainly in the traditional county of Dunbartonshire, which straddles the "Highland Line" between the Scottish Highlands and Lowlands.