Eucalyptus obliqua, commonly known as messmate stringybark[3] or messmate,[4] but also known as brown top, brown top stringbark, stringybark or Tasmanian oak,[5] is a species of tree that is endemic to south-eastern Australia.

It has rough, stringy or fibrous bark on the trunk and larger branches, smooth greyish bark on the thinnest branches, lance-shaped to curved adult leaves, flower buds in groups of seven to fifteen or more, white flowers and cup-shaped or barrel-shaped fruit.

Eucalyptus obliqua is a tree that typically grows to a height of 90 m (300 ft) or sometimes a mallee and forms a lignotuber.

The specimens were sent to the British Museum in London, where they were examined by Charles Louis L'Héritier de Brutelle.

[11][12][13][14] The specific epithet (obliqua) is from the Latin obliquus ("oblique"), in reference to the leaf bases of unequal length.

It occurs from sea level up to elevations of 1,475 m (4,839 ft) in the Northern Tablelands of New South Wales.

It is mostly used for pulp production and for construction and manufacture, especially in house building, joinery, flooring, and furniture.