Eucalyptus cameronii, commonly known as the diehard stringybark[3] is a flowering plant that is endemic to eastern Australia.

It is a small to medium-sized tree with rough, stringy bark from the trunk to the small branches, lance-shaped to curved adult leaves, flowers buds in groups of between nine and fifteen, white flowers and cup-shaped, hemispherical or more or less spherical fruit.

The type specimen was collected in the Diehard State Forest near Glen Innes.

The specific epithet (cameronii) honours Archibald Peter Cameron, one of the collectors of the type specimen.

[7][8] Diehard stringybark grows in forest on the ranges and escarpments on the eastern side of the Northern Tablelands from just north of the Queensland border as far south as the Cottan-Bimbang National Park.