| Gleann Loch | |
| Pushpin Map: | Scotland Argyll and Bute |
| Location: | North Knapdale, Scotland |
| Coords: | 56.0384°N -5.5051°W |
| Type: | Reservoir |
| Basin Countries: | Scotland, United Kingdom |
| Area: | 121000m2 |
| Volume: | 495000m2 |
| Elevation: | 209m (686feet) |
The loch runs south west to north east and is an impounding reservoir located to the west of Lochgilphead, Scotland. It is one of a number of lochs supplying water to the Crinan Canal. The earthen dam is 15 metres high. Records show the dam was constructed before 1860.