| Abbreviation | Definition |
|---|---|
| I&PR | Information Public Relations |
| I&PR | Information & Public Relations |
| i.e. | Id Est (that is) |
| i.e. | that is (id est [Lat.]) |
| I/O | in and out |
| I+O | in and out |
| I2 | Internet 2 |
| IA | Immediate Action |
| IA | In Absence |
| IA | Industrial Attachment |
| IA | Information Access |
| IABC | International Association of Business Communicators |
| IACA | International Association of Currency Affairs |
| IAG | Illinois Attorney General |
| IAI | International Alliance for Interoperability |
| IANA | Internet Assigned Numbers Authority |
| IAORG | Information Awareness Organization |
| IAP | Integrated Applications Promotion Programme |
| IAS | Insurance Accounting System |
| IAS | Internationally Accepted Standard |