Allocasuarina acuaria is a shrub of the genus Allocasuarina native to the Wheatbelt, Goldfields-Esperance and Great Southern regions of Western Australia.. The dioecious shrub typically grows to a height of 1 to 3 metres (3 to 10 ft). The cone is often obscured by the elongate bracteoles. It is found in heath areas of white-yellow sand.