Corymbia haematoxylon, commonly known as mountain marri,[2] is a species of tree that is endemic to the south-west of Western Australia.

Corymbia haematoxylon is a tree that typically grows to a height of 15 m (49 ft) and forms a lignotuber.

[2][3][4][5] Mountain marri was first formally described in 1914 by Joseph Maiden who gave it the name Eucalyptus haematoxylon and published the description in Journal and Proceedings of the Royal Society of New South Wales.

[4][8] Corymbia haematoxylon grows in open forest on flats and slopes in sandy soil over sandstone or laterite.

[3][5] The tree is associated with marri (Corymbia calophylla) woodland and resembles a miniature version of that species.