Thryptomene decussata is a species of flowering plant in the family Myrtaceae and is endemic to Western Australia.

It is an erect shrub with upward pointing, egg-shaped leaves, and white or pink flowers with five petals and twenty to thirty stamens in two whorls.

[2][3] This species was first formally described in 1904 by William Vincent Fitzgerald who gave it the name Scholtzia decussata in the Journal of the West Australian Natural History Society.

[7] This thryptomene is widely distributed from near Shark Bay to near Leonora, growing on sand plains, breakaways and on stony ridges in the Coolgardie, Gascoyne, Murchison and Yalgoo biogeographic regions.

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