Allocasuarina rigida is a species of flowering plant in the family Casuarinaceae and is endemic to eastern Australia.

Male flowers are arranged in spikes 10–70 mm (0.39–2.76 in) long, with about 4 to 6.5 whorls per centimetre (per 0.39 in.

[2][3] This sheoak was first formally described in 1848 by Friedrich Anton Wilhelm Miquel who gave it the name Casuarina rigida in the journal, Revisio critica Casuarinarum from specimens collected near Moreton Bay.

[4] In 1982, Lawrie Johnson transferred the species to Allocasuarina as A. rigida in the Journal of the Adelaide Botanic Gardens.

[5][6] In the same journal, Johnson described two subspecies of A. rigida and the names are accepted by the Australian Plant Census: Allocasuarina rigida grows in sandy soil on volcanic outcrops in exposed situations from the McPherson Range in south-eastern Queensland to the Gibraltar Range National Park and Ebor in north-eastern New South Wales and in disjunct populations on Mount Cooroora in south-eastern Queensland and Big Nellie Mountain near Taree in north eastern New South Wales.