Grevillea arenaria is a shrub which is endemic to the east of New South Wales in Australia. It has an erect to spreading habit and grows to between 1 and 3 metres in height. Its leaves are 1.5 to 7 cm long and 3 to 15 mm in width. The flowers, which occur in groups of 2 to 10, are pink, red or orange, with green or yellow at the base and green styles. These occur year-round, with a major flourish in spring. The species was first formally described by botanist Robert Brown in Transactions of the Linnean Society of London in 1810. There are currently two recognised subspecies: