Ach' An Todhair, a small hamlet on the shore of Loch Linnhe in the Fort William area, is in the Scottish council area of the Highland, Scotland. It is located along the A82 road directly south of Fort William. A bus serves the hamlet, connecting it to Fort William in the north and Corran and Inchree to the south. A number of graves of Clan Campbell are said to be located in this area of the lochside. It is mentioned in a poem in Hugh MacDiarmid's poetry collection The golden treasury of Scottish poetry which goes, "the sloucher of them was lying in Ach' an Todhair. Whoso climbed Tom na-h-aire ? Many were the new paws there badly salted, the death-cloud on their eyes, lifeless after being scourged with sword-blades".
A 174.86 hectare area of woodland near the hamlet has been designated as a Site of Special Scientific Interest (SSSI). It was formerly part of the Loche Linnhe SSSI which was established in 1967.