Grevillea murex is a shrub of the genus Grevillea native to a small area in the Mid West region of Western Australia. The spreading many branched shrub typically grows to a height of 1 to 2.5 metres (3 to 8 ft) and has non-glaucous branchlets. It has simple dissected tripartite leaves with a blade that is 3 to 6 millimetres (0.12 to 0.24 in) in length. It blooms from April to September and produces a terminal or axillary raceme irregular inflorescence with green, white or cream flowers. Later it forms pitted ellipsoidal or oblong glabrous fruit that is 9 to 13 mm (0.4 to 0.5 in) long.