- YSF stands for Yaesu System Fusion (digital radio system)
- YSF stands for Youth Science Foundation (Canada)
- YSF stands for Youth Service Fund (United Methodist Youth)
- YSF stands for You’re So Funny
- YSF stands for Youth Sports Festival (various locations)
- YSF stands for Yoshida Scholarship Foundation (Japan)
- YSF stands for Stony Rapids, Saskatchewan, Canada – Stony Rapids (Airport Code)
- YSF stands for Yield Safety Factor
- YSF stands for Yale School of Forestry
- YSF stands for You’re So Fine
- YSF stands for Yoshi’s San Francisco (Oakland, CA restaurant)
YSF