Prostanthera campbellii is a species of flowering plant in the family Lamiaceae and is endemic to the south-west of Western Australia.

It is an erect shrub with linear leaves and white to cream-coloured flowers with purple striations.

[2][3] Prostanthera campbellii was first formally described in 1882 by Ferdinand von Mueller in the journal Southern Science Record from specimens collected by John Forrest near the Gascoyne River.

[5] This mintbush grows on granite outcrops and rocky places in the South-West and Eremaean botanical regions of Western Australia.

[2][3] Prostanthera campbellii is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.