Bentham Lasiopetalum oldfieldii is a species of flowering plant in the family Malvaceae and is endemic to the south-west of Western Australia.

The sepals are pink, sometimes with a green base, the lobes 3.3–4.9 mm (0.13–0.19 in) long, white and hairy on the back.

[2][3] Lasiopetalum oldfieldii was first formally described in 1860 by Ferdinand von Mueller in Fragmenta Phytographiae Australiae from specimens collected near the Murchison River by Pemberton Walcott and Augustus Oldfield.

[6] This lasiopetalum grows in open mallee woodland, scrub or shrubland from near Port Gregory to near Mullewa in the Geraldton Sandplains biogeographic region of south-western Western Australia.

[2][3] Lasiopetalum oldfieldii 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.