Cyperus hesperius is a sedge of the family Cyperaceae that is native to Australia.
The perennial sedge typically grows to a height of and has a tufted habit and produces yellow-brown flowers.
In Western Australia it is found on rocky hillsides in the Pilbara region where it grows in red sandy-loamy soils.
The species was first described in 1991 by Karen Wilson. There are no synonyms.