Daer Reservoir
[file:Southern_Upland_Way_at_Daer_Reservoir_-_geograph.org.uk_-_195341.jpg|right|thumb|Daer Reservoir and dam|alt=Daer Reservoir and dam with a blue footbridge extending out into the water and mown grass banks surrounding and a stone wall leading up to the dam]
Daer Reservoir is a man-made waterbody created by the damming of the Daer Water, a tributary of the River Clyde in the Southern Uplands of Scotland. It lies within the Lowther Hills in South Lanarkshire. It is accessible by a minor public road leaving the A702 follows the Daer Water south to the dam and then continues along the western margin of the reservoir as far as Kirkhope. The reservoir was officially opened by Elizabeth II in 1956 to supply water to the Scottish Central Belt.