Grevillea occidentalis is a shrub of the genus Grevillea native to an area in the Great Southern region of Western Australia. The spreading to erect shrub typically grows to a height of 0.4 to 1.8 metres (1 to 6 ft) and has non-glaucous branchlets. It has simple flat undissected narrowly ellpitic leaves with a blade that is 10 to 45 millimetres (0.4 to 1.8 in) in length and 2 to 8 mm (0.08 to 0.31 in) wide. It blooms from August to February and produces a terminal or axillary raceme irregular inflorescence with white, pink or grey flowers. Later it forms ovoid, simple and hairy fruit that is 8 to 11 mm (0.3 to 0.4 in) long.