Epacris crassifolia is a species of flowering plant in the heath family Ericaceae and is endemic to south-eastern New South Wales, Australia. It is a low-lying shrub with elliptic to egg-shaped leaves with the lower end towards the base, and tube-shaped, white or cream-coloured flowers clustered near the ends of the branches.
Epacris crassifolia is a low-lying shrub that typically grows to a height of up to and has stems with prominent leaf scars. The leaves are elliptic to egg-shaped with the narrower end towards the base, long and wide on a petiole long. The flowers are arranged in clusters near the ends of branches and are white or cream-coloured, tube-shaped and swollen near the middle, their size depending on subspecies, on a peduncle long. Flowering occurs from November to January and the fruit is a capsule long.
Epacris crassifolia was first formally described in 1810 by Robert Brown in his Prodromus Florae Novae Hollandiae et Insulae Van Diemen. The specific epithet (crassifolia) means "thick-leaved".
In 1996, R.K. Crowden and Yvonne Menadue described two subspecies of E. crassifolia and the names are accepted by the Australian Plant Census:
This epacris grows on sandstone rock ledges and in rock crevices on the Central and South Coasts of New South Wales and inland as far as the Blue Mountains.