Acacia amanda is a species of flowering plant in the family Fabaceae and is endemic to a very restricted part of the Northern Territory. It is an erect shrub with narrowly elliptic or elliptic, leathery phyllodes, flowers arranged spherical heads of golden yellow flowers usually arranged in a raceme, and narrowly oblong pods long.
Acacia amanda is an erect, often multi-stemmed shrub which grows to a height of . Its branchlets are smooth, and have a waxy bloom. Its phyllodes are thinly leathery, narrowly elliptic to elliptic, straight to strongly curved, long and wide with three main veins. The flowers are golden yellow and arranged in spherical heads of 35 to 53, the heads in racemes long, with up to 3 heads in each axil, on a peduncle long. Flowering occurs from May to November and the fruit is a glabrous, papery, narrowly oblong pod long and wide, and prominently raised over the seeds. The seeds are long.
Acacia amanda was first formally described in 2001 by Gregory John Leach in the Flora of Australia from specimens he collected near the track to Jarrangbarnmi (Koolpin Gorge), in Kakadu National Park. The specific epithet (amanda) honours Leach's wife.
This species is endemic to a small area on the Arnhem Plateau in Kakadu.
Acacia amanda is listed as "near threatened" under the Territory Parks Wildlife Conservation Act.