Prostanthera staurophylla, commonly known as Tenterfield mint-bush,[3] is a species of flowering plant in the family Lamiaceae and is endemic to a small area on the New England Tableland of New South Wales.

It is an erect to spreading, strongly aromatic shrub with hairy branches, deeply lobed leaves and bluish-mauve flowers with darker markings.

[4][5] Prostanthera staurophylla was first formally described in 1875 by Ferdinand von Mueller in Fragmenta Phytographiae Australiae from material collected between Tenterfield and the Severn River by Charles Stuart.

The discovery in 2001 by John T. Hunter and J.B. Williams of a specimen in the Mount Mackenzie Nature Reserve was the first record of the species in 130 years.

The main threats to the species include its small population size, grazing, disturbance by pigs and goats, trampling and illegal collection of wildflowers.