Denhamia oleaster is a shrub or small tree within the family Celastraceae, endemic to Queensland.

The species inhabits a variety of environments, from monsoon forest to semi-arid savanna and occurs on a broad range of soil types.

In more humid locales the species can grow to 6 metres in height, although it may not reach more than 1 metre in less favourable environments.

John Lindley described the plant as Melicytus oleaster in 1848, it being discovered on explorer Sir Thomas Mitchell's expeditions into northern Australia.

[2] Denhamia oleaster is found in across inland Queensland in open woodland and scrubland in the Brigalow Belt, as well as wetter monsoon forests in the northern reaches of its distribution.