| Abbreviation | Definition |
|---|---|
| ISWB | International School of Walvis Bay |
| ISWD | International School of Well Drilling |
| ISWK | Indian School Al Wadi Al kabir |
| ISWK | Indian School Wadi Kabir |
| ISY | International School Yangon |
| ISYA | International School for Young Astronomers |
| ISYA | International Schools for Young Astronomers |
| ITC | Instructional Technologies Center |
| ITMS | Indian Trail Middle School |
| ITMS | Indian Trails Middle School |
| ITPS | International Test Pilots School |
| ITSC | Inter-Tribal Student Council |
| ITSS | International Travelling Summer School |
| ITT | Initial Teacher Training |
| IUBS | Irish University Business School |
| IUCS | Imus Unida Christian School |
| IVCS | Indiana Virtual Charter School |
| IVMS | Indian Valley Middle School |
| IVMS | Island Village Montessori School |
| IVS | Illinois Virtual School |