The Birnam Oak is an example of Sessile oak (Quercus petraea) at Birnam, Perth and Kinross, Scotland (grid reference ). Sometimes known as Macbeth's oak, as it is a relic of Birnam Wood, mentioned in William Shakespeare's play, the tree is found in a strip of woodland on the south bank of the River Tay. The trunk is 5.5 metres wide and its large spreading branches have latterly been supported on a number of struts to prevent them from collapsing under their own weight. The tree is listed as one of the Forestry Commission's Heritage Trees.
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- Magnusson, Magnus (2000), Scotland: the story of a nation, HarperCollins
- Pakenham, Thomas (1997), Meetings with remarkable trees, London: Phoenix Illustrated
- "Oak", Forestry Commission: Heritage Trees, retrieved July 27, 2017