Darwinia oldfieldii is a species of flowering plant in the family Myrtaceae and is endemic to Western Australia.

Darwinia oldfieldii is an erect, spreading shrub that typically grows to a height of 15–50 cm (5.9–19.7 in).

Its leaves are oblong with a blunt tip, usually less than 4.2 mm (0.17 in) long, with the edges curved down.

[2][3] First formally described in 1865 by George Bentham, the description was published in the Journal of the Linnean Society, Botany in 1867 from a specimen collected by Augustus Oldfield near the Murchison River.

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