| Abbreviation | Definition |
|---|---|
| IGBP | Interdisciplinary Society of Biological Psychiatry |
| IGF | Internally Generated Funds |
| IGSSA | Independent Girls School Sports Association |
| IGSSA | Independent Girls Schools Sports Association |
| IGTA | International Gay Travel Association |
| IHP | Institut Henri Poincar |
| IIA | The Internet Industry Association |
| IIBA | International Institute of Business Analysis |
| IIC | Insurance Institute of Canada |
| IIC | International Institute of Communications |
| IICA | Inter-American Institute for Cooperation on Agriculture |
| IICR | Institute of Inspection, Cleaning, and Restoration |
| IIDA | International Interior Design Association |
| IIE | Institute of Industrial Engineers |
| IIGOP | Independent Information Governance Oversight Panel |
| IIHT | Indian Institute of Hardware Technology |
| IILP | International Institute for Lath & Plaster |
| IIM | International Institute of Management |
| IIOP | Indian Institute Of Packaging, Mumbai, India |
| IIP | Integrated Infrastructure Project |