Gahnia lanigera, also known as the black grass saw-sedge, desert saw-sedge or little saw-sedge , is a species of flowering plant in the sedge family that is found in southern Australia.

The specific epithet lanigera means 'woolly'.

The plant is a rhizomatous, tufted perennial sedge growing up to 45 cm high and 2 m wide, with stiff, narrow, sharp-pointed leaves.

[1][2] It is a favoured food plant of Antipodia atralba, the black and white skipper butterfly.

[3] The species occurs in arid parts of southern Western Australia, South Australia, north-western Victoria and western New South Wales where it is found on sandy soils in mallee woodland and heathland, as well as on clayey or granitic loams and coastal dunes.