Banksia sessilis, commonly known as parrot bush, is a species of shrub or tree in the plant genus Banksia in the Proteaceae family. It had been known as Dryandra sessilis until 2007, when the genus Dryandra was sunk into Banksia. Widespread throughout southwest Western Australia, it is found on sandy soils over laterite or limestone, often as an understorey plant in open forest, woodland or shrubland. Encountered as a shrub or small tree up to 6 m (20 ft) in height, it has prickly dark green leaves and dome-shaped cream-yellow flowerheads. Flowering from winter through to late spring, it provides a key source of food—both the nectar and the insects it attracts—for honeyeaters in the cooler months, and species diversity is reduced in areas where there is little or no parrot bush occurring.