| Acronym | Definition |
|---|
| CY | City |
| CY | Country |
| CY | Cyprus |
| CY | Copy |
| CY | Capacity |
| CY | Cy Young Award Winner (baseball) |
| CY | Cycle |
| CY | Cyber |
| CY | Calendar Year |
| CY | County (IRB) |
| CY | Current Year |
| CY | Contract Year |
| CY | Cymraeg (Welsh, ISO 639 language code) |
| CY | Cyberspace |
| CY | Cyclophosphamide |
| CY | Children and Youth |
| CY | Cubic Yard |
| CY | Container Yard |
| CY | Chinese Yuan |
| CY | Current Yield (finance) |
| CY | Cryptology |
| CY | Cyprus Airways Ltd (IATA airline code) |
| CY | Chief Yoeman (rank; US Navy) |
| CY | Cyber Yugoslavia |
| CY | Challenge for Youth (Northern Ireland) |
| CY | Commonwealth Year (TV show Andromeda) |
| CY | Communications Yeoman (naval signals rating) |