Grevillea sulcata is an shrub of the genus Grevillea native to an area in the Great Southern region of Western Australia. The spreading shrub typically grows to a height of 0.3 to 1.5 metres (1.0 to 4.9 ft) and has non-glaucous branchlets. It has simple, undissected, flat and linear leaves with a blade that is 8 to 30 millimetres (0.31 to 1.18 in) and 1 to 1.5 mm (0.04 to 0.06 in) wide. It blooms between July and September and produces a terminal raceme irregular inflorescence with red flowers and red styles. Later it forms smooth ovoid glabrous fruit that are 13 mm (0.5 in) long.