Eucalyptus williamsiana, commonly known as the large-leaved stringybark,[2] is a species of small to medium-sized tree that is endemic to northern New South Wales.

Eucalyptus williamsiana is a tree that typically grows to a height of 20 m (66 ft) but often less, and forms a lignotuber.

[2][3][4] Eucalyptus williamsiana was first formally described in 1990 by Lawrie Johnson and Ken Hill from specimens collected near the western edge of the Gibraltar Range National Park in 1985.

[4][5] The specific epithet (williamsiana) honours "J.B." Williams for his contribution to knowledge of the flora of the New England region.

[4] The large-leaved stringybark grows in woodland on the eastern side of the Northern Tablelands between Wallangarra in southern Queensland and Niangala in New South Wales.