Eucalyptus delegatensis is a tree that typically grows to a height of , sometimes to , and forms a
lignotuber. The bark is rough, grey to black, fibrous or stringy on the lower half of the trunk, smooth white to greyish above. Young plants and
coppice regrowth have broadly lance-shaped to egg-shaped leaves long and wide. Adult leaves are lance-shaped to curved, the same glossy green to bluish green on both sides, long and wide on a
petiole long. The flower buds are arranged in groups of between seven and fifteen in leaf
axils on an unbranched
peduncle long, the individual buds on a
pedicel long. Mature buds are oval to club-shaped, green to yellow or red, long and wide with a conical or rounded
operculum with a small point on the tip. Flowering occurs between December and March and the flowers are white. The fruit is a woody barrel-shaped to hemispherical
capsule long and wide with the valves near rim level or enclosed in the fruit. ==Taxonomy and naming==