| Acronym | Definition |
|---|
| UIR | Usb to Infrared Adapter |
| UIR | Universal Infrared Receiver |
| UIR | Umatilla Indian Reservation (Oregon) |
| UIR | University-Industry Relations (various schools) |
| UIR | Upper Flight Information Region |
| UIR | United Islamic Republic (fictional organization) |
| UIR | Unusual Incident Report |
| UIR | Unitary Irreducible Representation (mathematics) |
| UIR | User Interface Requirement |
| UIR | Wire Connector (used on drawings, etc.; phonetically, UIR sounds like 'wire') |
| UIR | Uniform Impedance Resonator |
| UIR | User Incident Report |
| UIR | Unidentified Infrared Feature |
| UIR | Unemployment Insurance Reporter (CCH) |