Grevillea wittweri is a species of flowering plant in the family Proteaceae and is endemic to the southwest of Western Australia.

It is a shrub with pinnatipartite leaves, and clusters of greenish to fawn flowers with a crimson style.

Flowering occurs from September to April and the fruit is an oblong or ovoid follicle 12–14 mm (0.47–0.55 in) long and covered with woolly, glandular hairs.

[6] The specific epithet (wittweri) honours Ernst Wittwer, the superintendent of Kings Park, Perth from 1974 to 1980.

[7] This grevillea has a scattered distribution in the area between Gnowangerup, Newdegate, Lake Johnston and Ravensthorpe in the Coolgardie, Esperance Plains and Mallee bioregions of south-western Western Australia.