Ricinocarpos trichophorus is a species of flowering plant in the family Euphorbiaceae and is endemic to the south coast of Western Australia.

Ricinocarpos trichophorus is an erect, openly branched, monoecious shrub that typically grows to a height of up to 1.8 m (5 ft 11 in), its young branchlets densely covered with greyish-white, star-shaped hairs.

[2][3] Ricinocarpos trichophorus was first formally described in 1864 by Johannes Müller Argoviensis in the journal Linnaea, from specimens collected near the Swan River by James Drummond.

[6] This species grows in shrubland between sandstone and granite boulders from near the Fitzgerald River and south-west of Ravensthorpe, and north east of Esperance, in the Esperance Plains and Mallee bioregions of southern Western Australia.

[2][3] Ricinocarpos trichophorus is listed as "Threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions,[3] meaning that it is in danger of extinction.