Eucalyptus nandewarica, commonly known as mallee red gum,[2] is a species of tree or mallee that is endemic to a small area of western New South Wales.

Eucalyptus nandewarica is a tree or mallee that typically grows to a height of 10 m (33 ft) and forms a lignotuber.

The flower buds are arranged in groups of three or seven in leaf axils on an unbranched peduncle 3–8 mm (0.12–0.31 in) long, the individual buds on pedicels up to 2 mm (0.079 in) long.

[2][3] Eucalyptus nandewarica was first formally described in 1990 by Lawrie Johnson and Ken Hill in the journal Telopea, from specimens collected in the Mount Kaputar National Park in 1986.

[4] The specific epithet (nandewarica) refers to the Nandewar Range where this species occurs.