IYS
| 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) |