Grevillea pachylostyla, commonly known as Buchan River grevillea, is a shrub species which is endemic to the upper reaches of the Buchan River in the eastern highlands of Victoria, in Australia. It has a spreading habit, growing to 1.5 metres high. The leaves are deeply lobed. Flowers appear between October and February (mid spring to late summer) in its native range. These have cream perianths with contrasting black underneath and inside and cream styles that turn pink or red after antithesis.