| Abbreviation | Definition |
|---|---|
| IHDS | Irvine Hebrew Day School |
| IHE(s) | Institute(s) of Higher Education |
| IHHS | Immaculate Heart High School |
| IHHS | Indian Hill High School |
| IHHS | Indian Hills High School |
| IHMS | Immaculate Heart of Mary School |
| IHMS | Indian Hill Middle School |
| IHMS | Indian Hills Middle School |
| IHMS | Iron Horse Middle School |
| IHS | Independence High School |
| IHS | Independent High School |
| IHS | Inderkum High School |
| IHS | Irvine High School |
| IHS | Irvington High School |
| IHS | Issaquah High School |
| IHSA | Illinois High School Association |
| IHSL | Indian Home School Liaisons |
| IHSL | International High School at Lafayette |
| IHSSA | Idaho High School Swimming Association |
| IIBS | Indore Indira Business School |