SJU may refer to:
Education Saint John's University (disambiguation), the name of several institutions Saint Joseph's University, a private university in Philadelphia, Pennsylvania, United States Sejong University, a private university in Seoul, South Korea Shanghai Jiao Tong University, a public university in Shanghai, China Southwest Jiaotong University, a public university in Chengdu, Sichuan, China St. Jerome's University, a public university in Waterloo, Ontario, Canada
Other uses Luis Muñoz Marín International Airport, in Carolina, Puerto Rico, IATA airport code SJU Sju Hundred, a former subdivision of Uppland, Sweden, Northern Europe Ume Sámi, the ISO 639-3 language code