Thomas, Earl of Mar, (c. 1330–1377) was a 14th-century Earl of Mar,[1] an earldom located in the County of Aberdeen, Scotland. He is sometimes styled Mormaer of Mar since mormaer was the Scottish Gaelic equivalent of the English word earl. Because the identification and numbering of the ancient earls of Mar is debatable, Thomas is variously numbered the ninth,[2] tenth,[3] or thirteenth.[4] of the ancient earls. He was a son of Domhnall II of Mar, who fell at the Battle of Dupplin Moor in 1332.