| OIRLLC | Okaloosa Island Restoration Limited Liability Company | |
| OIRO | Oláh Ibolya Rajongói Oldal (Hungarian) | |
| OIRO | Offers In Region Of | |
| OIRO | Oxford Institute for Radiation Oncology | |
| OIRO | Oxford Institute for Radiation Oncology | |
| OIRP | Office of International Relations and Protocol | |
| OIRS | Oficina de Informaciones Reclamos y Sugerencias | |
| OIRS | Orpheus Island Research Station | |
| OIRS | Oficinas de Informacion Reclamos y Sugerencias | |
| OIRS | Osun Internal Revenue Service | |
| OIRS | Office of Intramural Recreational Sports | |
| OIRS | Office of Immigration and Refugee Services | |
| OIRS | Optical Isotope Ratio Spectroscopy | |
| OIRS | Office of Integrative Research in the Sciences | |
| OIRS | Office of Integrative Research in the Sciences | |
| OIRS | Orthopedic Implant Removal Surgery | |
| OIRSA | Organismo Internacional Regional de Sanidad Agropecuaria | |
| OIRSA | Organismo Internacional Regional de Sanidad Agropecuaria | |
| OIRSA | Office of Institutional Research and Student Assessment | |
| OIRSA | Office of Institutional Research and Student Assessment | |
| OIRT | Organisation International de Radio et Télévision | |
| OIRT | Urmieh, Iran | |
| OIS | Operational Information system | |
| OIS | Oahu Information Service | |
| OIS | Open Interface Specification |
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