| Lough Atedaun | |
| Pushpin Map: | Island of Ireland |
| Pushpin Map Alt: | Lough Atedaun location in Ireland |
| Pushpin Label Position: | none |
| Pushpin Map Caption: | Location in Ireland |
| Location: | County Clare |
| Inflow: | River Fergus |
| Outflow: | River Fergus |
| Catchment: | 176.63km2 |
| Basin Countries: | Ireland |
| Length: | 1km (01miles) |
| Width: | 0.6km (00.4miles) |
| Area: | 0.38km2 |
| Depth: | 2.3m (07.5feet) |
| Max-Depth: | 7m (23feet) |
| Elevation: | 13m (43feet) |
Lough Atedaun is a freshwater lake in the Mid-West Region of Ireland. It is located in The Burren of County Clare.
Lough Atedaun measures about 1km (01miles) long and 0.5km (00.3miles) wide. It is about 15km (09miles) north of Ennis near the village of Corofin.
Lough Atedaun lies along the River Fergus which flows in from neighbouring Inchiquin Lough. Nearby Lough Cullaun also flows in to Lough Atedaun. The lake is highly eutrophic.
Fish species in Lough Atedaun include perch, rudd, pike, stone loach and the critically endangered European eel. The lake is part of the East Burren Complex Special Area of Conservation. It is also part of the Corofin Wetlands Special Protection Area.