Grevillea byrnesii is a species of flowering plant in the family Proteaceae and is endemic to north-western Australia.

The flowers are orange, the pistil is 9–11 mm (0.35–0.43 in) long and the style has a yellow tip.

Flowering occurs from May to August and the fruit is a glabrous follicle 17–24 mm (0.67–0.94 in) long.

[6] This grevillea grows in shrubland and open woodland on ridge tops and sand dunes in the East Kimberley and Great Sandy Desert regions of northern Western Australia, and in the Victoria River district of the Northern Territory.

It is also listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.