| Abbreviation | Definition |
|---|---|
| CYSL | Chichester Youth Soccer League |
| CYSL | Chico Youth Soccer League |
| CYSL | Chillicothe Youth Soccer League |
| CYSL | Coast Youth Soccer League |
| CYSL | Coastal Youth Soccer League |
| CYSL | Colonial Youth Soccer League |
| CYSL | Coronado Youth Soccer League |
| CYSL | CT Youth Ski League |
| CYSM | Chinese Youth Society of Melbourne |
| CYSO | Cascade Youth Symphony Orchestras |
| CYSO | Chesapeake Youth Symphony Orchestra |
| CYSO | Chicago Youth Symphony Orchestras |
| CYSO | Claremont Youth Symphony Orchestra |
| CYSO | Colorado Youth Symphony Orchestras |
| CYSO | Cyprus Youth Symphony Orchestra |
| CYSR | Children and Youth Services Review |
| CYSS | Child Youth and School Services |
| CYSS | Child Youth School Services |
| CYT | Cannabis Youth Treatment |
| CYT | Christian Youth Theater |