Leucopogon crassiflorus is a species of flowering plant in the heath family Ericaceae and is endemic to the south-west of Western Australia. It is an erect shrub with few branches and that typically grows to a height of 30–60 cm (12–24 in). Its leaves are broadly egg-shaped with the narrower end towards the base, to more or less round, 2–3 mm (0.079–0.118 in) long with a stem-clasping base. The flowers are borne singly or in pairs in upper leaf axils on a short peduncle, sometimes in small clusters, and with small bracts and bracteoles at the base. The sepals are about 4 mm (0.16 in) long and the petals about 6.5 mm (0.26 in) long, the petal lobes longer than the petal tube.