Sulby Glen is a wooded glen in Sulby, Isle of Man through which the Sulby River flows from the Sulby Reservoir (the largest reservoir in the island) towards Ramsey.
The area is contiguous with Tholt-y-Will, a forest in the glen. The glen is managed, preserved and maintained in a semi-natural state by government agencies, the Forestry Amenity and Lands Directorate of the Department of Environment, Food and Agriculture.
Coordinates: 54°17′42″N 4°29′16″W / 54.2951°N 4.4877°W