Xanthorrhoea platyphylla is a species of grasstree of the genus Xanthorrhoea native to Western Australia.
The perennial grass tree typically grows to a height of 3m (10feet) with the trunk reaching 0to, scape of 0.5to and the flower spike to 0.9to. It blooms in June producing cream-white flowers.
It has a scattered distribution along the south coast in the Great southern and Goldfields-Esperance regions of Western Australia between Albany and Cape Arid where grows in sandy-clay soils containing gravel.