Gartnait of Mar, Earl of Mar – Gartnait mac Domhnall, 8th Mormaer (or Earl) of Mar, was a Scottish noble during the first War of Scottish Independence (1296–1328). His name is sometimes rendered as Gartney or Gratney. A son of Domhnall I, Earl of Mar, and his wife, Elen ferch Llywelyn, Gartnait of Mar died in about 1305.