Cyperus prolixus is a species of sedge that is native to southern parts of North America, Central America and tropical parts of South America. It is a perennial plant that grows up to 2 meters (6 ft 7 in) tall. The leaves are long and narrow, and the flowers are small and white. Cyperus prolixus is found in a variety of habitats, including wetlands, meadows, and roadsides. It is a common plant and is not considered to be threatened or endangered.

The species was first formally described by the botanist Carl Sigismund Kunth in 1816.

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