| Acronym | Definition |
|---|
| IRIR➣I Ride I Recycle (skateboards) |
| IRIR➣Institutul Roman de Istorie Recenta (Romanian Institute for Recent History) |
| IRIR➣Islamic Republic of Iran Railways (state-owned railway system) |
| IRIR➣Internet Resources for Institutional Research (Association for Institutional Research) |
| IRIR➣Inter-Racial Inter-Religious Harmony Nite (Singapore) |