| Abbreviation | Definition |
|---|---|
| IRN | International Rental News |
| IRPI | Investigative Reporting Project Italy |
| IRT | Ice Road Truckers |
| ISB | Internet Satellite Broadcast |
| ISBN | International Standard Book Number |
| ISML | International SaiMoe League |
| ISO | International Standards Organization |
| ISRIP | In Situ Remediation Integrated Program |
| IT | Information Technology |
| ITLN | Indian Transport Logistics News |
| ITN | Imaging Technology News |
| ITTU | Intermediate Technology Training Units |
| ITU | International Telecommunication Union |
| IVP | Inter Varsity Press |
| IVQ | Intelligent Vehicle Quarterly |
| IVRU | Interactive Voice Response Unit |
| IW | Internet World |
| IWMF | International Women's Media Foundation |
| IWN | I Witness News |
| IWN | Inland Waterways News |