Marianthus ringens is a species of flowering plant in the family Pittosporaceae and is endemic to the southwest of Western Australia.

It is a shrub or climber with thick, elliptic leaves and yellow and orange-red flowers that darken as they age, arranged dense clusters.

[2][3] This species was first formally described in 1855 by William Henry Harvey who gave it the name Calopetalon ringens in Hooker's Journal of Botany and Kew Garden Miscellany from an unpublished description by James Drummond.

[7] Marianthus ringens grows in wet places between Dongara and the Murchison River in the Geraldton Sandplains bioregion of south-western Western Australia.

[2][3] This marianthus is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.