It is a spreading shrub with divided leaves, the end lobes linear and tapering, and groups of red or orange flowers, often with streaks of pink or cream.

Flowering occurs from August to September and the fruit is oblong to elliptic follicle 10–15 mm (0.39–0.59 in) long.

[4][3] Grevillea dielsiana was first formally described in 1943 by Charles Gardner in the Journal of the Royal Society of Western Australia from material he collected near the Murchison River.

[7] Diels grevillea grows in heath or shrubland between Geraldton, Mullewa and Shark Bay in the Avon Wheatbelt, Geraldton Sandplains and Yalgoo biogeographic regions of south-western Western Australia.

[4][3] Grevillea dielsiana is listed as Least Concern on the IUCN Red List and "not threatened" by the Western Australian Government Department of Parks and Wildlife It has a stable population and does not currently face any major threats.