Posted in Engineering, Religion, Schools & Education, Science 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)