Robert Capellanus ("Robert the Chaplain"; d. c. 1249), was a chaplain of King William I of Scotland and afterwards, Bishop of Ross (1214–1249). On 25 February 1213, he witnessed a confirmation of the properties of Arbroath Abbey as Roberto Capellano domini regis, "Robert Chaplain of the lord king". King William had had another chaplain called Robert who became Archdeacon of Glasgow 1195 × 1196, but although neither used surnames, it is certain that they were not the same men. It would probably be possible to know more about Robert if he had used a surname, but as it happens his details are lost in those large number of Norman and Anglo-Norman incomers in William's reign using that name.