Banksia kingii is an extinct species of tree or shrub in the plant genus Banksia. It is known only from fossil leaves and fruiting "cones" found in Late Pleistocene sediment at in western Tasmania. These were discovered by Deny King in the workings of his tin mine. The climate was most likely as cool as or cooler than it is at Melaleuca now (an average yearly temperature of 11.5C, an average temperature of the coldest month of 4.5 °C, a mean maximum temperature of the warmest month of 20 °C), and possibly wetter, over 2400 mm annually.