Clan MacEwen or Clan MacEwan is a Scottish clan recorded in the fifteenth century as Clan Ewen of Otter. Historically, there have been several different MacEwen clans and septs, with some distinct, and some interrelated, origins for the modern surname. Each of these historical clans could be described by the name, "Clan MacEwen" or, at times, "Clan Ewen". Since the death of Swene MacEwen in 1493, the clan has not had a chief recognized by either the members, or the Lord Lyon King of Arms, and as such Clan MacEwen is considered an Armigerous clan.