| Abbreviation | Definition |
|---|---|
| IRF | Interrupted Return Feed |
| IRFS | Institute for Reporters' Freedom and Safety |
| IRIB | Islamic Republic Of Iran Broadcasting |
| IRNA | Islamic Republic News Agency |
| IRNA | Israel Resource News Agency |
| IRS | Interested Readers Society |
| IRS | Interested Readers' Society |
| IS | Image Stabilization |
| ISB | International Star Bulletin |
| ISBK | I should Be King |
| ISBO | Islamic States Broadcasting Organization |
| ISBQ | Interactive Story By Query |
| ISBU | Islamic Broadcasting Union |
| ISBW | I Should Be Writing |
| ISCI | International Standard Commercial Identification |
| ISE | In Search of Excellence |
| ISFA | International Scientific Film Association |
| Iso | I seek only |
| ISP | Internet Service Provider |
| ISSN | International Standard Serial Number |