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