IRSO
| Acronym | Definition |
|---|---|
| IRSO | Institute of Road Safety Officers (UK) |
| IRSO | Institut de recherche en santé d’Ottawa (French: Ottawa Health Research Institute, Ottawa, Canada) |
| IRSO | Islamic Resistance Support Organization (Hezbollah charity fund) |
| IRSO | Iranian Society of Ophthalmology (est. 1947) |
| IRSO | Installation Radiation Safety Officer |
| IRSO | International Road Safety Organization |