Hypocalymma hirsutum is a species of flowering plant in the myrtle family Myrtaceae, and is endemic to the south west of Western Australia.

Both sides of the leaves are same shade of green and there are many tiny oil glands on the lower surface.

The flowers are sessile and usually arranged singly in leaf axils with egg-shaped bracts and bracteoles with the narrower end towards the base, about 2.5 mm (0.098 in) long, tinged with pink and dentate.

[2][3][4] Hypocalymma hirsutum was first formally described in 2003 by Arne Strid and Gregory John Keighery in the Nordic Journal of Botany from specimens collected 48 mi (77 km) from Coorow on the road to Green Head in 1974.

[3] This species of Hypocalymma grows in beakaways and hilltops on shrubland, heath or open woodland between Eneabba and Lesueur National Park in the Avon Wheatbelt, Geraldton Sandplains and Swan Coastal Plain bioregions of south-western Western Australia, where it grows in sandy lateritic soils.