IJS

IJS may refer to:

• ISU Judging System or International Judging System, scoring system for figure skating
• Institute of Jazz Studies, library and archive in Newark, New Jersey
• International Journal of Speleology, scientific journal founded in 1978
• International Society for Evangelisation of the Jews, a Christian organisation, predecessor to the Christian Witness to Israel
• Islamabad Japanese School, international school in Islamabad
• Jožef Stefan Institute, science and technology institute in Ljubljana, Slovenia
• Southeast Ijo language (ISO 639 code)
• Sisters of the Infant Jesus, Catholic religious institute in Paris