Fimbristylis microcarya is a sedge of the family Cyperaceae that is native to Australia.

The annual grass-like or herb sedge typically grows to a height of 5 to 40 centimetres (1.97 to 15.75 in) and has a tufted habit.

It blooms between February and July and produces brown flowers.

[1] In Western Australia, it is found in and around swamps and claypans and along creeks and rivers in the Kimberley and Pilbara regions where it grows in brown clay-sand or red loam soils.

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