Grevillea exul is a species of flowering plant in the family Proteacae, endemic to New Caledonia.It grows up to 10 metres in height and has narrow lanceolate to elliptic leaves which have a blunt apex. The flowers are usually white, followed by follicles which are 12–20 mm (0.47–0.79 in) long and 9–15 mm (0.35–0.59 in) in width. It is a manganese accumulator.