Acacia forsythii, commonly known as Warrumbungle Range wattle, is a shrub belonging to the genus Acacia and the subgenus Phyllodineae that is native to parts of eastern Australia.
The shrub typically grows to a height of and has an erect to spreading habit and has glabrous reddish coloured branchlets. The linear, straight or slightly curved phyllodes have a narrowly oblanceolate shape. The phyllodes have a length of and a width of with a prominent mid-vein. It blooms between October and March producing yellow flowers.
It is found along the east coast of northern New South Wales at higher altitudes in the Warrumbungle Range as a part of dry sclerophyll forest communities.