Grevillea roycei is a shrub of the genus Grevillea native to an area in the Wheatbelt region of Western Australia. The shrub typically grows to a height of 1 to 2 metres (3 to 7 ft) and has non-glaucous branchlets. It has simple dissected tripartite leaves with a blade that is 7 to 25 millimetres (0.28 to 0.98 in) long. It blooms from August to October and produces a terminal raceme irregular inflorescence with green or white flowers and white styles. Later it forms smooth oblong or ellipsoidal glabrous fruit that is 8 to 12 mm (0.3 to 0.5 in) long.