| Abbreviation | Definition |
|---|---|
| IPX | Internet Packet Exchange |
| IQ | Information Query |
| IR | Index Return |
| IR | Interim Release |
| IRB | Interface Requirements Board |
| IRC | Internet Ready Computer |
| IRC | Internet Relay Chat |
| IRDS | Information Resource Dictionary System |
| IRIS | Image Recall Image Storage |
| IRIS | Integrated Raster Imaging System |
| IRIS | Integrated Romanian Information System |
| IRL | Internal Representation Language |
| IRM | Information Resource Management |
| IRP | Information Retrieval Protocol |
| IRQ | Integrated Request Query |
| IRQ | Interrupt ReQuest |
| IRS | Intelligent Register System |
| IRS | Interchange Recors Separator |
| IRT | In Real Time |
| IS | Information System |