Commersonia grandiflora is a species of flowering plant in the family Malvaceae and is endemic to the south of Western Australia.

Flowering occurs from July to November and the fruit is a spherical capsule 5–7 mm (0.20–0.28 in) in diameter and densely-covered with white, star-shaped hairs and bristles.

[2] This species was first described in 1837 by Stephan Endlicher who gave it the name Rulingia grandiflora in Enumeratio plantarum quas in Novae Hollandiae ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel from specimens collected from King George Sound.

[3][4] In 2011, Carolyn Wilkins and Barbara Whitlock transferred the species to the genus Commersonia as C. grandiflora in the journal Australian Systematic Botany.

[2][7] Commersonia grandiflora is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.