Eleocharis sundaica is a sedge of the family Cyperaceae that is native to Australia.

[1] The rhizomatous perennial herb to grass-like sedge typically grows to a height of 0.6 to 1 metre (2.0 to 3.3 ft) and is sometime found partly submerged.

It blooms between May and August producing white flowers.

[1] It is found in and around swamps and pools of water in the Kimberley region of Western Australia where it grows in sandy soils.