| Abbreviation | Definition |
|---|---|
| ISM | International School Moshi |
| ISM | International Student Ministry |
| ISMA | International Students Meetingpoint Amsterdam |
| ISMU | Irkutsk State Medical University |
| ISN | Interactive Student Notebook |
| ISO | Indian Student Organization |
| ISOP | International Student Orientation Program |
| ISOSA | Indo Swiss Old Students' Association |
| ISP | Independent Study Program |
| ISP | Information Society Project |
| ISPA | Instituto Superior de Psicologia Aplicada |
| ISPA | Iowa Student Personnel Association |
| ISPM | Institute of Synthetic Polymeric Materials |
| ISPS | Institution for Social and Policy Studies |
| ISQ | International Studies Quarterly |
| ISR | Institute for Sensory Research |
| ISRA | Institute of State and Regional Affairs (Pennsylvania State University) |
| ISS | Institute of Social Studies |
| ISS | Instructional Support Staff |
| ISS | Integrative Studies in Social Sciences |