Dunalastair (Scottish Gaelic: Dùn Alastair, meaning "fort of Alexander") is an estate in the southern part of the Highlands, in Perthshire, Scotland.
However the present ruined house, despite widespread but incorrect information, has no association with the clan, the land having been sold prior to its construction.
There is the ruin of an old baronial-style mansion in the grounds, built in 1862 by General Macdonald, the then-owner of Dunalastair.
The original tower house was burnt down after the 1745 rebellion, as the great chieftain Alexander Robertson of Struan was a Jacobite supporter.
The estate is overlooked by the peak of Schiehallion, a conical mountain sometimes translated as "Fairy hill of the Caledonians".