| Acronym | Definition |
|---|
| OIR | Online Image Resizer |
| OIR | Operation Inherent Resolve (combat operations) |
| OIR | Optical-Infrared (astronomy) |
| OIR | Oxford International Review (journal; UK) |
| OIR | Office of Insurance Regulation |
| OIR | Order Instituting Rulemaking (California) |
| OIR | Office of Institutional Research |
| OIR | Occupational Injury Rate (workers) |
| OIR | Online Insertion and Removal (Cisco) |
| OIR | Online Information Review (journal) |
| OIR | Old Irish |
| OIR | Oracle I-Recruitment |
| OIR | Object Information Repository |
| OIR | Online Insertion and Removal |
| OIR | Operational Intelligence Requirements (US DoD) |
| OIR | Office of International Research (various locations) |
| OIR | Office of Independent Review (Los Angeles County, California) |
| OIR | Office of Information Resources |
| OIR | Office of Instructional Resources |
| OIR | Office of Intramural Research |
| OIR | Other Intelligence Requirements (US DoD) |
| OIR | Official International Rules (Mahjong) |
| OIR | Optical Interface Rates |
| OIR | Organización Internacional Para Los Refugiados (Spanish: International Organization for Refugees; UN) |
| OIR | Office of Internal Review |
| OIR | Organization for Industrial Research |
| OIR | Optimal Information Rate |
| OIR | Oxford Investment Research (UK) |
| OIR | Other Information Requirement |
| OIR | Official International Reserves (Department of Finance; Canada) |
| OIR | Operational & Information Requirements |