Well Hill is a Graham of 606.1 m in Dumfries and Galloway, South Lanarkshire. All four of its nearest neighbours are higher, up to Hart Fell at 808 m.
Only four of the 737 hills profiled in Scotland are lower. It is the lowest of the seven register hills in the The Glenkens to Annandale region, where Cairnsmore of Carsphairn is highest. It falls on two OS 1:50,000 sheets, 71 and 78.