A cay is a small, low-elevation, sandy island on the surface of a coral reef.

Cay or CAY may also refer to:

Places[edit]

• 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[edit]

• Cay Holmberg (born 1933), Swedish Navy officer
• Cay (band), a British 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