| Abbreviation | Definition |
|---|---|
| ILRS | International Leibniz Research School |
| ILSC | International Leadership Student Council |
| ILSCF | Independent Lower Schools Choral Festival |
| ILSMT | International Law School Mediation Tournament |
| ILSP | Introduction to Law School and the Profession |
| ILSP | Introduction to Law School the Profession |
| IMAS | International Modern Arabic School |
| IMBA | International Muay Boran Academy |
| IMCS | International Mountain Climbing School |
| IMES | Increase Miller Elementary School |
| IMHS | Iron Mountain High School |
| IMMS | Independence Middle Magnet School |
| IMMS | Indian Mound Middle School |
| IMMS | Irma Marsh Middle School |
| IMPI | Instituto Mexicano de la Propiedad Industrial |
| IMS | Ironton Middle School |
| IMS | Issaquah Middle School |
| IMSA | Illinois Mathematics and Science Academy |
| IMSA | International Montessori School of Albania |
| IMSB | Islamabad Model School for Boys |