Clan MacDuff or Clan Duff is a Lowland Scottish clan. The clan does not currently have a chief and is therefore considered an Armigerous clan, which is registered with the Lyon Court. The early chiefs of Clan MacDuff were the original Earls of Fife, although this title went to the Stewarts of Albany in the late fourteenth century. The title returned to the MacDuff chief when William Duff was made Earl Fife in 1759. His descendant Alexander Duff was made Duke of Fife in 1889.