| OIIJ | Karaj, Iran | |
| OIIK | Ghazvin, Iran | |
| OIIM | Khoram Dareh, Iran | |
| OIIN | Delijan, Iran | |
| OIIO | Open International Internet Olympiad | |
| OIIQ | Ghom, Iran | |
| OIIR | Garmsar, Iran | |
| OIIR | Office of International and Interagency Relations | |
| OIIR | Office of Inclusion and Intercultural Relations | |
| OIIR | Occupational Injury and Illness Rate | |
| OIIR | Office of Institutional Information and Research | |
| OIIS | Semnan, Iran | |
| OIIS | Organisation islamique internationale de secours | |
| OIIS | Oxaliplatin Immune Induced Syndrome | |
| OIIS | Operator Individual Inspection Sheet | |
| OIIT | Office of Informational and Instructional Technology | |
| OIIT | Office of Innovation and Information Technology | |
| OIIT | Office of Instructional and Information Technology | |
| OIIT | Office of International Investment and Trade | |
| OIIT | Office of Information and Instructional Technologies | |
| OIIT | Office of Instructional Information Technology | |
| OIIT | Oxaliplatin Induced Immune Thrombocytopenia | |
| OIIT | Office of Information and Instructional Technology | |
| OIIU | Damghan, Iran | |
| OIIU | Outer Islands Implementation Unit |
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