Eucalyptus roycei, commonly known as Shark Bay mallee,[2] is a species of mallee or a small tree that is endemic to a small area along the Gascoyne coast of Western Australia.

It has rough fibrous or flaky bark on the lower trunk, smooth greyish bark above, lance-shaped to curved adult leaves, flower buds in groups of seven or nine, cream-coloured or pale yellow flowers and cylindrical to barrel-shaped, four-sided fruit.

The fruit is a woody, cylindrical to barrel-shaped, four-sided capsule 15–30 mm (0.59–1.18 in) long wide with the valves below the level of the rim.

The type specimen was collected near Hamelin Pool in 1966 by Eleanor Marion Scrymgeour and Maisie Carr.

[5][6][7] The specific epithet (roycei) honours Robert Dunlop Royce who was a member of the staff of the Western Australian Herbarium.