| Abbreviation | Definition |
|---|---|
| ISOP | International School Of Paphos, Cyprus |
| ISOP | International School of Poznan |
| ISOS | Integrated School of Ocean Sciences |
| ISOSA | International School of South Africa |
| ISP | International School of Panama |
| ISP | International Schools Partnership |
| ISPP | International School of Phnom Penh |
| ISPS | The International School of Port of Spain |
| ISQ | Independent Schools Queensland |
| ISQ | International School of Qingdao |
| ISR | In School Restriction |
| ISR | International Schools Review |
| ISS | In-School Suspension |
| ISS | Iredell Statesville Schools |
| ISSD | International School of Santo Domingo |
| ISSD | Islamic School of San Diego |
| ISSE | International School to School Experience |
| ISSEM | International Summer School in Economics and Management |
| ISSF | Independent Schools of South Florida |
| ISSG | International School St Gallen |