Grevillea ( /ɡrɨˈvɪliə/) is a diverse genus of about 360 species of evergreen flowering plants in the protea family Proteaceae, native to Australia, New Guinea, New Caledonia, and Sulawesi. It was named in honour of Charles Francis Greville. The species range from prostrate shrubs less than 0.5 m tall to trees 35 m tall. Common names include Grevillea, Spider Flower, Silky-oak and Toothbrush.
Closely related to the genus Hakea, the genus gives its name to the subfamily Grevilleoideae. Many species of grevilleas are popular garden plants, especially in Australia but also in other temperate and subtropical climates. Many grevilleas have a propensity to interbreed freely, and extensive hybridisation and selection of horticulturally desirable attributes has led to the commercial release of many cultivars. Among the best known are Grevillea 'Robyn Gordon', a small shrub up to 1.5 metres high and wide which can flower 12 months of the year in subtropical climates.