Grevillea psilantha is a shrub of the genus Grevillea native to a small area in the Kimberley region of Western Australia. The many branched shrub typically grows to a height of 1 to 2 metres (3 to 7 ft) and has non-glaucous branchlets. It has simple linear undissected flat leaves with a blade that is 80 to 130 millimetres (3.1 to 5.1 in) long and 3 to 8 mm (0.12 to 0.31 in) wide. It blooms from April to July and produces a terminal raceme irregular inflorescence with white flowers and styles. Later it forms obovoid glabrous fruit that is 9 to 14 mm (0.4 to 0.6 in) long.