Commersonia rotundifolia, commonly known as round-leaved rulingia,[2] is a species of flowering plant in the family Malvaceae and endemic to the south-west of Western Australia.

It is an upright, openly-branched shrub with elliptic to round leaves with wavy edges, and white flowers in clusters of 3 to 10.

The flowers are about 10 mm (0.39 in) wide with five white, petal-like sepals that are hairy on the back, and petals with a narrow, spatula-shaped ligule.

[4][5] In 1882, Ferdinand von Mueller transferred the species to Commersonia as C. rotundifolia in his Systematic Census of Australian Plants.

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