Carex polyantha

{{Use dmy dates|date=December 2022}}

{{Short description|Species of plant}}

{{Speciesbox

| image =

| genus = Carex

| species = polyantha

| authority = F.Muell.

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Carex polyantha, commonly known as river sedge,{{cite web|url=https://vicflora.rbg.vic.gov.au/flora/taxon/2dc9acd9-80c7-433b-8333-57fa2bf02c86|title=Carex polyantha F.Muell River Sedge|accessdate=23 December 2022|work=VicFlora|publisher=Royal Botanic Gardens Victoria}} is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to eastern parts of Australia.{{cite web |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:301648-1|title=Carex polyantha F.Muell. |access-date=23 December 2022 |publisher=Kew Science – Plants of the World Online}}

The species is found along the eastern coast of Australia from Queensland in the north then south through coastal areas of New South Wales, eastern parts of Victoria and in Tasmania. In Victoria it is found in the Goldfirlds, Riverina, Gippsland, Volcanic Plains grassland and Victorian Alps.