Caustis gigas

{{Short description|Species of grass-like plant}}

{{speciesbox

|name = Giant twig-rush

|image =

|status =P2

|status_system =DECF

|genus = Caustis

|species = gigas

|authority = R.L.Barrett

|}}

Caustis gigas, commonly known as giant twig-rush, is a sedge that is native to Western Australia.{{FloraBase|name=Caustis gigas|id=13765}}

The rhizomatous perennial sedge has a robust habit and typically grows to a height of {{convert|2|m|ft|1}}. The plant blooms between April and May producing brown flowers.

It is found in the Wheatbelt region between Chittering and Coorow where it grows in sandy soils.