CY may be:
- Calendar year
 - Common year
 - Common Year (Greyhawk)
 - Logistic: Container Yard
 - Cubic yard, although the more frequent abbreviation is "cu yd"
 - Cyprus, ISO 3166, FIPS Pub 10-4 and obsolete NATO country code
 - Cyprus Airways, the IATA airline designator
 - the NYSE symbol for Cypress Semiconductor Corporation
 - the nickname of Leung Chun-ying
 
cy may be:
- Cyprus Internet country code top-level domain (ccTLD) 
.cy - Welsh language (ISO 639 alpha-2 language code, from the Welsh Cymraeg)
 
Cy may refer to:
- Cy (kitten), a kitten born in late 2005 with one eye and no nose due to a condition known as holoprosencephaly
 - Cy (Battlestar Galactica), a Cylon from Galactica 1980
 - Cy, the mascot of the Pee Dee Cyclones, of the SPHL
 - Cy the Cardinal, the mascot of Iowa State University
 - Cy Young, an American baseball player
 - An abbreviation for the cyclohexyl group in organic chemistry
 
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