Cyperus grayi, commonly known as Gray's flatsedge, is a species of sedge that is native to south eastern parts of the United States.
Gray's flatsedge is a perennial herb. It grows typically in dry, sandy soil in coastal plains.
Cyperus grayi was named and described by the American botanist John Torrey in 1836. Torrey referred to this species as Gray's galingale. , the botanical name Cyperus grayi is widely accepted.