ICYS
| Acronym | Definition |
|---|---|
| ICYS | International Conference of Young Scientists (Poland) |
| ICYS | International Center for Young Scientists (National Institute for Materials Science; Ibaraki, Japan) |
| ICYS | Innovative and Collaborative Youth Servicing (Australia) |
| ICYS | Icicle Creek Youth Symphony (classical music education and performance group; Leavenworth, WA) |