| Abbreviation | Definition |
|---|---|
| IYD | International Youth Department |
| IYF | Institute of Youth for Families |
| IYF | International Youth Federation |
| IYF | International Youth Fellowship |
| IYF | International Youth Forum |
| IYF | Iraqi Youth Foundation |
| IYG | Indian Youth Group |
| IYG | Indiana Youth Group |
| IYG | International Youth Gathering |
| IYHO | Islanders Youth Hockey Organization |
| IYLC | Indonesia Youth Leadership Conference |
| IYLC | International Youth Leader Conference |
| IYLC | International Youth Leadership Conference |
| IYLC | International Youth Leadership Council |
| IYLC | International Youth Literature Collection |
| IYLN | International Youth Leadership Network |
| IYM | Institute for Youth Ministry |
| IYR | Idaho Youth Ranch |
| IYRC | International Youth Robot Competition |
| IYS | Illinois Youth Survey |