Grevillea johnsonii (Johnson's Grevillea) is a shrub species which is endemic to New South Wales in Australia. It grows to between 2 and 4.5 metres high. The leaves are 10 to 25 cm long and have narrow lobes that are 0.7 to 1.5 mm wide. Flowers appear between August and November (late winter to late spring) in the species native range. These have red to orange perianths and styles. Grevillea johnsonii mainly occurs in the Goulburn and Capertee River catchments. The species was first formally described in 1975 by Donald McGillivray. It is closely related to Grevillea longistyla.