Banksia prionotes, commonly known as acorn banksia or orange banksia, is a species of shrub or tree of the genus "Banksia" in the family Proteaceae. It is native to the southwest of Western Australia and can reach up to in height. It can be much smaller in more exposed areas or in the north of its range. This species has serrated, dull green leaves and large, bright flower spikes, initially white before opening to a bright orange. Its common name arises from the partly opened inflorescence, which is shaped like an acorn. The tree is a popular garden plant and also of importance to the cut flower industry.