Acacia deficiens is a tree or shrub belonging to the genus Acacia and the subgenus Phyllodineae. It is native to an area in the Great Southern, Goldfields-Esperance and Wheatbelt regions of Western Australia. The prostrate spreading shrub typically grows to a height of 0.1 to 1.0 metre (0.33 to 3.3 ft). It blooms from September to October and produces yellow flowers.