| Abbreviation | Definition |
|---|---|
| IAS | International Aviculturists Society |
| IASP | International Association for the Study of Pain |
| IAT | Institute of Animal Technology |
| IATP | Institute for Agriculture and Trade Policy |
| IBA | Important Bird Area |
| IBEM | Institute for Barefoot Equine Management Ltd. |
| ICAAE | International Center for Aquaculture and Aquatic Environments |
| ICAR | International Congress on Animal Reproduction |
| ICAVA | Irish Companion Animal Veterinary Association (obsolete, now part of VI) |
| ICBP | International Council for Bird Preservation |
| ICH | International Co-operation on Harmonisation (of Technical Requirements for the Registration of Veterinary Medicinal Products) |
| ICH | International Co-operation on Harmonization |
| ICLAS | International Council for Laboratory Animal Science |
| ICRE | International Conference on Residency Education |
| ICRP | International Commission on Radiological Protection |
| ICVA | International Council for Veterinary Assessment |
| ICVS | International Center for Veterinary Services |
| ICVV | International Conference on Veterinary Vaccinology |
| IDB | Irish Dairy Board |
| ID-DLO | Institute for Animal Science and Health (Netherlands) |