| Abbreviation | Definition |
|---|---|
| IEF | Iso-Electric Focusing |
| IEP | Iso-Electric Point |
| IES | Intelligent Evacuation System |
| IFCA | Illinois Fertilizer and Chemical Association |
| IFSHC | International Federation of Societies for Histochemistry and |
| IFSHC | International Federation of Societies for Histochemistry and Cytochemistry |
| IG | Ideal Gas |
| IG | Inert Gas |
| IGAC | International Global Atmospheric Chemistry |
| IGCC | Integrated Gasification Combined Cycle |
| IGS | Insoluble Glue Substances |
| IH | Induction Heating |
| IHC | Immuno Histo Chemical |
| IHC | Immuno Histo Chemistry |
| IHC | Immunohistochemistry |
| IHOP | Information Hyperlinked Over Proteins |
| IIA | ISOPHOT Interactive Analysis |
| IIChE | Indian Institute of Chemical Engineers |
| IIChE | Israel Institute of Chemical Engineers |
| IICT | Indian Institute of Chemical Technology |