Sir Robert Keith (died 1346) was a Scottish nobleman and a hereditary Great Marischal of Scotland.

[1] Robert Keith fought for King David II of Scotland in his wars against Edward Balliol and the English.

[2] He accompanied King David when he fled for protection to France where the exiled Scottish royal court was given Château Gaillard as a residence.

Through this alliance the Keiths acquired large estates in Kincardinshire, and, by purchase, the sea-girt rock of Dunnattor, where they built a castle, which they made their chief seat.

The family was ennobled about 1458, and the fourth earl nearly doubled his domains by marriage with the heiress of Inveragie, and was reputed the wealthiest peer in Scotland.