Grevillea cagiana, commonly known as red toothbrushes,[3] is a species of flowering plant in the family Proteaceae and is endemic to the south-west of Western Australia.

It is an erect or spreading shrub with simple or divided leaves with linear lobes, and green, yellow, orange or pink flowers with red styles.

The flowers are arranged in toothbrush-like groups, the rachis 200–600 mm (7.9–23.6 in) long, the flowers green, yellow, orange or pink, the pistil mostly 16.5–21.5 mm (0.65–0.85 in) long and the style bright orange-red to red.

Flowering occurs from June to March and the fruit is a silky-hairy follicle 15–29 mm (0.59–1.14 in) long.

[5] The specific epithet (cagiana) honours Charles Austin Gardner, from his initials "C.A.G.".