Eucalyptus celastroides, commonly known by the Noongar name of mirret,[2] is a species of eucalypt that is endemic to the south-west of Western Australia.

It is a mallee, rarely a tree, and has rough bark on about half of the lower half of its tunk, smooth above, narrow lance-shaped adult leaves, flower buds in groups of seven or nine, white flowers and urn-shaped fruit.Eucalyptus celastroides is a mallee, rarely a tree, and typically grows to a height of 5 to 8 metres (16 to 26 ft) and forms a lignotuber.

Mature buds are club-shaped to pear-shaped or oval, 6–10 mm (0.24–0.39 in) long and 3–4 mm (0.12–0.16 in) wide with a rounded operculum with a small point on the tip, or conical.

[3][4][5] Eucalyptus celastroides was first formally described by Nikolai Turczaninow in 1852 from a specimen collected by James Drummond.

[8] In 1986, Ian Brooker described two subspecies in the journal Nuytsia and the names have been accepted by the Australian Plant Census:[9] Mirret is often found on flat or undulating country where it grows in sandy or clayey soils.