| Abbreviation | Definition |
|---|---|
| IML | Idaho Microfabrication Laboratory |
| IML | Instructional Materials Laboratory |
| IML | Intelligent Motion Laboratory |
| IMRL | Inorganic Materials Research Laboratory |
| IMRL | Irish Mycobacteria Reference Laboratory |
| INBRE | IDeA Network of Biomedical Research Excellence |
| INDE | Investigational New Drug Exemption |
| INL | Iberian Nanotechnology Laboratory |
| INL | Idaho Nuclear Laboratory |
| INOS | Inducible Nitric Oxide Synthase |
| INR | Impact Noise Rating |
| INR | International Normalized Ratio |
| INRL | Israel Neuroscience Research LInk |
| IOCM | Iso-Osmolar Contrast Medium |
| IOCV | Instituto de Oftalmologia Fundacion Conde de Valenciana |
| IOFSA | Intraoperative Frozen Section Analysis |
| IOL | Intra-Ocular Lens |
| IOU | Intensive Therapy Observation Unit. |
| IPA | ImmunoPeroxidase Assay |
| IPAL | Ic Portable Audio Laboratory |