Stenanthemum newbeyi is a species of flowering plant in the family Rhamnaceae and is endemic to a restricted area in the south of Western Australia.

It is an erect or spreading shrub with hairy young stems, egg-shaped leaves with the narrower end towards the base, and clusters of rust-coloured, densely shaggy-hairy flowers, surrounded by whitish floral leaves.

The flowers are densely shaggy-hairy and arranged in clusters of 5 to 15 up to 10 mm (0.39 in) wide, surrounded by whitish floral leaves.

[2][3] Stenanthemum newbeyi was first formally described in 1995 by Barbara Lynette Rye in the journal Nuytsia from specimens collected on Bungalbin Hill in 1989.

[2][3][5] Stenanthemum newbeyi is listed as "Priority Three" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[5] meaning that it is poorly known and known from only a few locations but is not under imminent threat.