| Abbreviation | Definition |
|---|---|
| IIBS | International Islamic Boarding School |
| IICS | Ipeka Integrated Christian School |
| IIPS | International Itinerant Paleographic School |
| IIS | Integrated International School |
| IIS | International Islamic School |
| IISC | IACR School on Cryptology |
| IISD | Irving Independent School District |
| IISR | International Indian School in Riyadh |
| IISR | International Indian School Riyadh |
| IJMS | Ira Jones Middle School |
| IJSD | International Journal on School Disaffection |
| ILCS | Inland Leaders Charter School |
| ILCS | Inland Leaders Charter Schools |
| ILCS | International League of Christian Schools |
| ILES | Indian Land Elementary School |
| ILES | Inter Lakes Elementary School |
| ILLC | Independent Living Learning Center |
| ILMS | Indian Lake Middle School |
| ILMS | Indian Land Middle School |
| ILR | Institute for Learning in Retirement |