| Abbreviation | Definition |
|---|---|
| IAR | Independent Animal Rescue |
| IAR | International Animal Rescue's |
| IAWC | IVSA Animal Welfare Conference |
| IBAR | Interafrican Bureau for Animal |
| ICAR | International Congress of Animal Reproduction |
| ICARE | Izard County Animal Rescue Effort |
| IFAP | Insane Fluffy Animal Productions |
| IFAW | The International Fund For Animal Welfare |
| IIAD | Institute for Infectious Animal Diseases |
| IIAE | International Institute for Animal Ethics |
| IIAL | International Institute for Animal Law |
| IJAN | Indian Journal of Animal Nutrition |
| ILAR | Institute for Laboratory Animals Research |
| ILAR | Institute Of Laboratory Animals Research |
| ILAVA | Indonesian Laboratory Animal Veterinarians Association |
| ILHAC | Iowa Livestock Health Advisory Council (Iowa State University; Ames, IA) |
| ilovecats | Someone who loves cats. Done. |
| ILRAD | International Laboratory for Research on Animal Diseases |
| INKAS | Ivins No Kill Animal Supporters |
| IPATA | International Pet And Animal Association |