CYS
| Acronym | Definition |
|---|---|
| CYS | Cysteine |
| CYS | Child and Youth Services |
| CYS | Configure Your Server |
| CYS | Club Young Scientists (Bulgaria) |
| CYS | Childhood and Youth Studies |
| CYS | Colorado Youth Soccer (Greenwood Village, CO) |
| CYS | California Youth Symphony |
| CYS | Count Your Sheep (webcomic) |
| CYS | Cyprus Organization for Standards and Control of Quality |
| CYS | Check Your Settings |
| CYS | Cheyenne, WY, USA - Cheyenne Municipal Airport (Airport Code) |
| CYS | Communist Youth of Siam (Thailand) |