Eucalyptus stenostoma, commonly known as the Jillaga ash,[2] is a small to medium-sized tree, endemic to a restricted part of New South Wales.

Eucalyptus stenostoma is a tree that typically grows to a height of 25 m (82 ft), often with a leaning trunk, and forms a lignotuber.

[2][3][4][5] Eucalyptus stenostoma was first formally described in 1972 by Lawrie Johnson and Donald Blaxell in Contributions from the New South Wales Herbarium.

The type specimens were collected in 1965 by David John Hynd (born 1937), near the head of the Tuross River north-west of Nerrigundah.

[2] Jillaga ash grows only in the catchment areas of the Tuross and Deua Rivers, in steeply sloping dry woodland on relatively infertile soils.