Acacia oxycedrus, commonly known as spike wattle, is an erect or spreading shrub which is endemic to Australia. It grows to up to 2 metres high and has sharp-pointed phyllodes with 3 or 4 prominent longitudinal veins. The bright yellow to pale yellow cylindrical flowerheads appear in groups of 1 to 3 in the axils of the phyllodes from July to October, followed by straight or slightly curved seed pods which are 4 to 10 cm long and 3 to 6 mm wide. The species occurs on sandy soil in dry sclerophyll forest or heath in South Australia, Victoria and New South Wales.