| Dunalastair Water | |
|---|---|
 Seen from the high ground to the south | |
  Dunalastair Water | |
| Location | Perth and Kinross, Scotland |
| Coordinates | 56°41′55″N 4°7′45″W / 56.69861°N 4.12917°W |
| Type | freshwater loch, reservoir |
| Basin countries | Scotland |
| Max. length | 2.5 km (1.6 mi) |
| Max. width | 800 m (2,600 ft) |
| Surface area | 1.65 km2 (0.64 sq mi) |
| Average depth | 1.5 m (4 ft 11 in) |
| Surface elevation | 198 m (650 ft) |
Dunalastair Water (Scottish Gaelic: "Loch Dhùn Alastair") is an entirely man made reservoir in Scotland which lies between Loch Rannoch and Loch Tummel in Strath Tummel in Perth and Kinross council area. The loch provides water power for the Tummel hydroelectricity power station and has the reputation as one of the best wild trout fishing locations in the United Kingdom.