Grevillea incrassata is a shrub of the genus Grevillea native to an area in the southern Wheatbelt and Goldfields regions of Western Australia. The shrub typically grows to a height of 0.3 to 2.3 metres (1 to 8 ft) and has non-glaucous branchlets. It has leaves with a blade that is 5 to 25 millimetres (0.20 to 0.98 in) in length and 0.5 to 1.5 mm (0.02 to 0.06 in) wide. It blooms from August to November and produces a terminal raceme irregular inflorescence with yellow flowers. Later it forms an obovois or spheroidal glabrous fruit that is 10 to 16 mm (0.4 to 0.6 in).