Allocasuarina pusilla, commonly known as heath oak-bush[2] or dwarf sheoak,[3] is a species of flowering plant in the family Casuarinaceae and is endemic to south-eastern continental Australia.

Allocasuarina pusilla is a spreading, dioecious shrub that typically grows to a height of 0.2–2 m (7.9 in – 6 ft 6.7 in) and has smooth bark.

[2][3][4] This sheoak was first formally described in 1927 by Ellen Dulcie Macklin who gave it the name Casuarina pusilla in the Transactions and Proceedings of the Royal Society of South Australia.

[5][6] It was reclassified in 1982 as Allocasuarina pusilla by Lawrie Johnson in the Journal of the Adelaide Botanic Gardens.

[7] The specific epithet (pusilla) means "very small",[8] possibly referring to the habit of the plant.