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