| Lough Craghy | |
| Pushpin Map: | Island of Ireland |
| Pushpin Map Alt: | Lough Craghy location in Ireland |
| Pushpin Label Position: | none |
| Pushpin Map Caption: | Location in Ireland |
| Location: | County Donegal |
| Outflow: | Dunglow Lough |
| Catchment: | 25.22km2 |
| Basin Countries: | Ireland |
| Length: | 1.4km (00.9miles) |
| Width: | 0.8km (00.5miles) |
| Area: | 0.5km2 |
| Elevation: | 14m (46feet) |
Lough Craghy, also locally known as Tully Lake, is a freshwater lake in the northwest of Ireland. It is located in north County Donegal in the Rosses fishery.
Lough Craghy is 3km (02miles) east of Dungloe. The lake drains westwards into Dunglow Lough.
Fish species in Lough Craghy include sea trout. These trout are seasonal, present in summer only.