| Acronym | Definition |
|---|
| YISS➣Youth Internet Safety Survey |
| YISS➣Yongsan International School of Seoul (South Korea) |
| YISS➣Youth in the Spirit Seminar |
| YISS➣Yeats International Summer School (Sligo, Republic of Ireland) |
| YISS➣Youth Inclusion Support Service (youth crime prevention; UK) |
| YISS➣Yours in Sea Scouting (Boy Scouts) |