| Abbreviation | Definition |
|---|---|
| IFPMA | International Federation of Pharmaceutical Manufacturers Associations |
| IFS | International Featured Standards |
| IFT | Institute of Food Technologists |
| IFU | Instructions For Use |
| IFWG | Interagency Food Working Group |
| IG | ImmunoGlobulin |
| IgA | Immunoglobin A |
| IgD | Immunoglobin D |
| IgE | Immunoglobulin E |
| IGF | Insulin-like Growth Factor |
| IgG | Immunoglobin G |
| IGIV | Immune Globulin Intra-Venous |
| IgM | Immunoglobin M |
| IHS | Indian Health Service (HHS) |
| IHSP | influenza Hospitalization Surveillance Project |
| IIC | Inspector-In-Charge |
| iiFAR | incurably ill for Animal Research |
| IIG | Inactive Ingredient Guide |
| IIMB | IT (Information Technology) Infrastructure Management Branch |
| IIMB(CDRH) | IT Infrastructure Management Branch (CDRH) |