| Abbreviation | Definition |
|---|---|
| IDS | Internet Dermatology Society |
| IDSA | Infectious Diseases Society of America |
| IEHO | Institute of Environmental Health Officers |
| IET | International Embryo Transfer Society |
| IEVI | Inland Empire Veterinary Imaging |
| IEWG | International Elbow Working Group |
| IEXAS | Institute of Experimental Animal Sciences (Osaka University) |
| IFA | Irish Farmers' Association |
| IFAH | International Federation for Animal Health |
| IFAH | International Federation of Animal Health |
| IFAP | International Federation of Agricultural Producers |
| IFAR | International Fund for Avian Research |
| IFAW | International Fund for Animal Welfare |
| IFB | Irish Food Board |
| IFGDSB | International Guide Dog Schools for the Blind |
| IFIC | International Food Information Council |
| IFPA | International Federation of Placental Associations |
| IFST | Institute of Food Science & Technology |
| IFT | Institute of Food Technologists |
| IG | Italian Greyhound |