| Abbreviation | Definition |
|---|---|
| IBPA | Independent Book Publishers Association |
| IBPAT | International Brotherhood of Painters & Allied Trades |
| IBQH | International Board for Quality in Healthcare |
| IBTA | InfiniBand Trade Association |
| IBTA | International Basement Tectonics Association |
| IBTA | International Business Training Association |
| IBTA | International Business Travel Association |
| ICA | Industrial Cooperative Association |
| ICA | International Cartographic Association |
| ICA | International Communication Association |
| ICAA | Insulation Contractors Association of America |
| ICAA | Investment Counsel Association of America |
| ICAB | The Institute of Chartered Accountants of Bangladesh |
| ICAEW | Institute of Chartered Accountants in England &andWales |
| ICAMA | Illinois Crime Analysis Microcomputing Association |
| ICAN | Institute of Chartered Accountants of Nigeria |
| ICAO | Institute of Chartered Accountants of Ontario |
| ICAO | International Cooperative Agricultural Organisation |
| ICASE | International Council of Associations for Science Education |
| ICAVL | Intersocietal Commission for the Accreditation of Vascular Laboratories |