| Abbreviation | Definition |
|---|---|
| IBES | International Broncho Esophagological Society |
| IBG | Institute of British Geographers |
| IBLS | Indonesian Business Law and Society |
| IBLS | Indonesian Business Law Society |
| IBLS | International Bio Logging Society |
| IBNS | International Bank Note Society |
| IBNS | International Behavioral Neuroscience Society |
| IBPS | International Buddhist Progress Society |
| IBRO | International Brain Research Organization |
| IBRO | Organisation Internationale de Recherche sur le Cerveau |
| IBS | International Berkeley Society |
| IBS | International Biometric Society |
| IBS | International Blackjazz Society |
| IBSS | International Bond and Share Society |
| IBU | International Union of Soil Sciences |
| IBU | Internationale Bodenkundliche Union |
| IBU | Union Internacional de la Ciencia del Suelo |
| IBU | Union Internationale de la Science du Sol |
| IBYS | International Bhakti Yoga Society |
| ICA | Association Cartographique Internationale |