| Islandeady Lough | |
| Pushpin Map: | Island of Ireland |
| Pushpin Map Alt: | Islandeady Lough location in Ireland |
| Pushpin Label Position: | none |
| Pushpin Map Caption: | Location in Ireland |
| Location: | County Mayo |
| Outflow: | Castlebar River |
| Catchment: | 55.94km2 |
| Basin Countries: | Ireland |
| Length: | 1.7km (01.1miles) |
| Width: | 1.1km (00.7miles) |
| Area: | 1.39km2 |
| Elevation: | 27m (89feet) |
Islandeady Lough is a freshwater lake in the west of Ireland. It is located in County Mayo.
Islandeady Lough measures about 2km (01miles) long and 1km (01miles) wide. It is located about 10km (10miles) west of Castlebar.
Islandeady Lough drains to neighbouring Castlebar Lough via the Castlebar River. The river in turn flows through Lough Lannagh before passing through Castlebar. Islandeady Lough is stocked annually with brown trout.