Grevillea manglesioides is a shrub of the genus Grevillea native to an area in the South West region of Western Australia. The erect shrub typically grows to a height of 0.9 to 4 metres (3 to 13 ft) and has non-glaucous branchlets. It has simple flat undissected leaves with a blade that is 30 to 80 millimetres (1.2 to 3.1 in) in length and 2 to 25 mm (0.08 to 0.98 in) wide. It blooms from July to December and produces a terminal or axillary raceme irregular inflorescence with green, white or red flowers. Later it forms granulose ellispoidal glabrous fruit that is 13 to 15 mm (0.5 to 0.6 in).