There are currently two earldoms of Mar in the Peerage of Scotland, and the title has been created seven times. The first creation of the earldom is currently held by Margaret of Mar, 31st Countess of Mar, who is also clan chief of Clan Mar. The seventh creation is currently held by James Erskine, 14th Earl of Mar and 16th Earl of Kellie, who is also clan chief of Clan Erskine.

Clan Mar is a Scottish clan of the Scottish Lowlands. It is also officially known as the Tribe of Mar. The chiefs of the Clan Mar were the original Earls of Mar, although this title later went via an heiress to the Douglases in the late fourteenth century, and then to the Stewarts before going to the Erskines. The current chief of Clan Mar is Margaret of Mar, Countess.