Acacia mimula is a tree in the genus Acacia. It is native to the Northern Territory, and found in open forest, from the Darwin region to western Arnhem Land.
Acacia mimula is a tree which grows up to 7 m high. Its bark is dark grey and has horizontal fissures. Its branchlets are flattened and smooth, and its stipules fall. The pulvinus is 3-4 mm long and minutely hairy. The phyllodes are elliptic, smooth, and curved, and are 70-180 mm long by 7-35 mm wide, with two to three primary veins. The secondary veins are oblique or penniveined or form a network. The base of the phyllode is attenuate, while the apex is obtuse. There are four to five glands along the dorsal margin. The axillary inflorescences are racemes or panicles, with 9-24 heads per raceme, on an axis 65-150 mm long. The white/cream heads are globular and 6-9 mm wide on smooth peduncles which are 6-14 mm long. The linear or oblong, slightly curved pods are greyish and 75-130 mm long by 20-28 mm wide. The broadly ellipsoid, brown seeds are transverse in the pod and 10 mm long by 7-9 mm wide. It flowers from April to June and fruits from August to September.
It can be confused with A. latescens.