| Abbreviation | Definition |
|---|---|
| IVS | Iowa Veterinary Specialties |
| IVSA | International Veterinary Students Association |
| IVU | Irish Veterinary Union (obsolete, now part of Veterinary Ireland) |
| IWC | International Wildlife Coalition |
| IWPA | International Weight Pull Association |
| IWRC | International Wildlife Rehabilitation Council |
| IZS | Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise (Italy) |
| JACOPIS | Joint Advisory Committee on Pets in Society (obsolete, now PAC) |
| JALAM | Japanese Association for Laboratory Animal Medicine |
| JAVMA | Journal of the American Veterinary Medical Association |
| JC | Jessica's Cat |
| JFA | Japanese Farriers Association |
| JFSSG | Joint Food Safety and Standards Group |
| JPFIA | Japan Pet Food Industry Association |
| JR | Jack Rabbit |
| JRA | Japan Racing Authority |
| JSLAE | Japanese Society for Laboratory Animal and Environment |
| JSVS | Japanese Society of Veterinary Science |
| JVMA | Jamaica Veterinary Medical Association |
| JVMA | Japan Veterinary Medical Association |