Cyperus javanicus, also known as the Javanese flatsedge,[2] is a sedge of the family Cyperaceae that is native to Indonesia and Australia.

[3] The rhizomatous glaucous perennial sedge typically grows to a height of 0.6 to 1.2 metres (2.0 to 3.9 ft) and has a tufted habit.

[4]/> The species was first formally described by the botanist Martinus Houttuyn in 1782 in the work Natuurlijke Histoire of Uitvoerige Beschryving der Dieren, Planten en Mineraalen.

[5] In Western Australia it is found beside pools and along streams and rivers in the Kimberley region where it grows in sandy-clay soils.

[3] The species is also endemic to the Northern Territory and north east Queensland and the Cape York Peninsula.