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