| OIR | Object Information Repository 
| Others |
| OIR | Office for Information Resources
| Others |
| OIR | Office of Industry Rubber
| Others |
| OIR | Office of Information Resources
| Others |
| OIR | Office of Instructional Resources
| Others |
| OIR | Office of Insurance Regulation
| Others |
| OIR | Office of Intercultural Relations
| Others |
| OIR | Office of Interdepartmental Regulation
| Others |
| OIR | Office of Intergovernmental Relations
| Others |
| OIR | Office of Intramural Research
| Others |
| OIR | Okushiri, Japan
| Others |
| OIR | Online Image Resizer
| Others |
| OIR | Online Insert and Removal
| Others |
| OIR | Online Insertion and Removal
| Others |
| OIR | Online Irish Register
| Others |
| OIR | Open Internet Regulation
| Others |
| OIR | Operation Inherent Resolve
| Others |
| OIR | Operational and Information Requirements
| Others |
| OIR | Operational Intelligence Requirements
| Others |
| OIR | Operations Integration Review
| Others |
| OIR | Operator In Residence
| Others |
| OIR | Optima Investment Research
| Others |
| OIR | Oracle I-Recruitment
| Others |
| OIR | Organisation Internationale de Radiodiffusion
| Others |
| OIR | Other Initiation of Repair
| Others |
| OIR | Other Intelligence Requirements
| Others |