| Lough Meelagh | |
| Pushpin Map: | Island of Ireland |
| Pushpin Map Alt: | Lough Meelagh location in Ireland |
| Pushpin Label Position: | none |
| Pushpin Map Caption: | Location in Ireland |
| Location: | County Roscommon |
| Catchment: | 7.04km2 |
| Basin Countries: | Ireland |
| Length: | 2.3km (01.4miles) |
| Width: | 0.9km (00.6miles) |
| Area: | 1.16km2 |
| Depth: | 4m (13feet) |
| Max-Depth: | 14m (46feet) |
| Elevation: | 50m (160feet) |
| Islands: | Orchard Island |
Lough Meelagh is a freshwater lake in the northwest of Ireland. It is located in north County Roscommon.
Lough Meelagh measures about 2km (01miles) long and 1km (01miles) wide. It lies about 10km (10miles) west of Drumshanbo, near the village of Keadue. The Kilronan Castle estate occupies the western shore of the lake.
Fish species in Lough Meelagh include perch, roach, pike, and the critically endangered European eel.