Cairnsmore of Carsphairn is a hill in the Carsphairn and Scaur Hills range, part of the Southern Uplands of Scotland. An alternative name, rarely used nowadays, is Cairnsmore of Deugh. It is the highest hill in the range, and its summit is just under north-east of Carsphairn village as the crow flies, in the far north of Kirkcudbrightshire.