Prostanthera hirtula, commonly known as hairy mintbush,[2] is a species of flowering plant in the family Lamiaceae and is endemic to the south-eastern continental Australia.

It is a strongly aromatic, densely hairy, spreading shrub with narrow egg-shaped leaves and dark mauve flowers, and that grows in exposed, rocky sites.

The flowers are borne in leaf axils near the ends of branchlets with bracteoles about 2 mm (0.079 in) long at the base.

[2][3] Prostanthera hirtula was first formally described in 1870 by George Bentham from an unpublished description by Ferdinand von Mueller, based on specimens collected at Mount Buffalo and Mount Disappointment by Mueller and in the Grampians by Carl Wilhelmi.

[4][5] Hairy mintbush grows on elevated, rocky sites in woodland and open forest in New South Wales from the Blue Mountains to the Budawang Range and in southern Victoria.