A cay is a small, low-elevation, sandy island on the surface of a coral reef.
Cay or CAY may also refer to:
Places Cay (volcano), a volcano in the Andes mountains in Chile Çay, a town and district in Turkey Cayman Islands, by IOC country code Cayenne – Félix Eboué Airport, by IATA airport code
Other uses Cay Holmberg (born 1933), Swedish Navy officer Cay (band), an English alternative rock band The Cay, a novel by Theodore Taylor Cayuga language, an Iroquoian language of Canada and the United States Central Alaskan Yup'ik language, an Eskimo language of Alaska, United States Chevra Ahavas Yisroel, a Jewish congregation in Brooklyn, New York, United States Histidine, by genetic code