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

It is an erect shrub, with linear leaves, and white flowers with 25 to 35 stamens.

[2][3][4] Hypocalymma uncinatum was first formally described in 2003 by Arne Strid and Greg Keighery in the Nordic Journal of Botany from specimens collected on south-east of Muntadgin in 1963.

[4] This species of Hypocalymma grows on granite outcrops in woodland, thicket or scrub between Merredin and Lake King in the Avon Wheatbelt and Mallee bioregions of south-western Western Australia, where it grows in sandy or loamy soils with lateritic gravel.

[2][4] Hypocalymma uncinatum is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.