Ricinocarpos stylosus is a species of flowering plant in the family Euphorbiaceae and is endemic to the Norseman district of Western Australia.

Flowering occurs between August and January, and the fruit is more or less spherical capsule 7.0–10 mm (0.28–0.39 in) in diameter.

[2][3] Ricinocarpos stylosus was first formally described in 1904 by Ludwig Diels in Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie from specimens collected near Coolgardie.

[4][5] The specific epithet (stylosus) means "indicating marked development of the style".

[6] This species grows in woodland or open forest in the Norseman district in the Coolgardie and Mallee bioregions in the south-west of Western Australia.