Acacia sessilis is a shrub of the genus Acacia and the subgenus Phyllodineae. It is native to an area along the west coast in the Wheatbelt and Peel regions of Western Australia. The diffuse, straggly and pungent shrub typically grows to a height of 0.3 to 1.0 metre (1.0 to 3.3 ft). It blooms from July to October and produces yellow flowers.