| Gleann Dubh | |
| Location: | Barcaldine, Scotland |
| Coords: | 56.5287°N -5.2878°W |
| Type: | Reservoir |
| Pushpin Map: | Scotland Argyll and Bute |
| Basin Countries: | Scotland, United Kingdom |
| Area: | 166000m2 |
| Elevation: | 32m (105feet) |
The reservoir (the "Black Glen") is an impounding reservoir located 9 kilometres north east of the Connel Bridge in Barcaldine Forest. The earthen dam is 23.4 metres high and was completed in 1984. The reservoir provides a supply of water for the hydroelectric scheme at the Marine Resource Centre in the village of Barcaldine.