Grevillea oldei is a shrub which is endemic to New South Wales in Australia. It grows to between 0.4 and 1.2 metres high. The leaves are 1 to 3.5 cm long, and 1.5 to 6 mm wide and often have sharply pointed tips. Flowers appear between June and February (early winter to late summer) in its native range. These have red perianths and styles. Grevillea oldei occurs in eucalypt woodland or heath between Mangrove Mountain and Woy Woy.