Eucalyptus gunnii, commonly known as cider gum, is a species of small to medium-sized tree endemic to Tasmania. Is evergreen trees or large shrubs, often fast-growing, some with attractive bark, most with aromatic foliage, and clusters of small, white, yellow or red flowers. Juvenile foliage bright glaucous-blue, rounded; adult leaves elliptic or sickle-shaped, grey-green. Flowers white, in small clusters.

Cider gum grows in woodland and occurs on the plains and slopes of the central plateaux and dolerite mountains at altitudes up to about 1,100 m (3,600 ft), with isolated occurrences south of Hobart. This species is noted for exceptional cold tolerance for a eucalyptus (to −12 °C, exceptionally −16 °C for brief periods) and is now commonly planted as an ornamental tree.

Fast-growing, it will produce a tree up to 37 m (121 ft) tall when mature, with growth rates of up to 1.5 m (4 ft 11 in), rarely 2 m (6 ft 7 in), per year. Pruning can be employed to maintain the tree as a small shrub if required and more shaded spots will restrict growth. It does grow in full sun on sandy/chalky soils, well supplied with water, but prefers a loamy soil; it does not tolerate very wet sites.