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

It is a shrub, herb, or slender twiner with elliptic leaves and white, blue or purple flowers arranged in small clusters.

[2][3][4] This species was first formally described in 1845 by Alois (Aloys) Putterlick who gave it the name Oncosporum drummondianum in Lehmann's Plantae Preissianae.

[5][6] In 1863, George Bentham transferred the species to Marianthus as M. drummondianus in his Fragmenta Phytographiae Australiae.

[8] Marianthus drummondianus grows in open woodland and forest on slopes, near creeks and on roadsides from the Darling Range near Perth to the Porongurup National Park, in the Avon Wheatbelt, Esperance Plains, Jarrah Forest and Warren bioregions of south-western Western Australia.