| Acronym | Definition |
|---|
| IYS➣International Year of Sanitation (United Nations) |
| IYS➣Indiana Youth Soccer |
| IYS➣Iris Yellow Spot (virus) |
| IYS➣In Your Service (Ashburn, VA) |
| IYS➣Impact Youth Services (Kogarah Bay, Australia) |
| IYS➣Integrated Youth Services, Inc. (various locations) |
| IYS➣Ideal Year of Scouting (troop program; Boy Scouts of America) |