Ricinocarpos trichophyllus is a species of flowering plant in the family Euphorbiaceae and is endemic to north-western Australia.

Ricinocarpos trichophyllus is an open, slender, monoecious shrub that typically grows to a height of 0.7–1.5 m (2 ft 4 in – 4 ft 11 in), its young branchlets covered with white, star-shaped hairs.

[2][3] Ricinocarpos trichophyllus was first formally described in 2007 by David Halford and Rodney John Francis Henderson in the journal Austrobaileya, from specimens collected near Nancy's Gorge in the Spirit Hills Conservation Area in the Victoria River region of the Northern Territory in 1996.

[2] This species grows in shrubland and woodland in the Drysdale River National Park in the Kimberley region of Western Australia and in the Moyle and Victoria River regions of the Northern Territory.

[2][3][5] Ricinocarpos trichophyllus is listed as "Priority One" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[3] meaning that it is known from only one or a few locations which are potentially at risk.