Gastrimargus musicus, the yellow-winged locust[1] or yellow-winged grasshopper, is a common grasshopper in Australia.

It only displays its yellow back wings in flight, when it also emits a loud clicking or crackling sound.

[2] When swarming, the adults become dark brown.

[2] They are sometimes confused with the Australian plague locust (Chortoicetes terminifera), though the yellow winged locust is "stouter and larger".

In north Australian savannas it remains a solitary species.