Acacia pachyacra is a tree or shrub belonging to the genus Acacia and the subgenus Phyllodineae.. It is native to an area in the Pilbara and Goldfields regions of Western Australia. The bush slender tree or shrub typically grows to a height of 1 to 5 metres (3.3 to 16.4 ft). It blooms from August to October and produces yellow flowers.