| Abbreviation | Definition |
|---|---|
| IFB | Institute Of Furahan Biology |
| IFMBE | International Foundation for Medical and Biological Engineering |
| IGB | Institute for Genomic Biology |
| iGEM | International Genetically Engineered Machine |
| IGSB | Institute for Genomics and Systems Biology |
| IHB | Institute for Historical Biology |
| IHG | I Have Genes |
| IICB | Indian Institute of Chemical Biology |
| IIIGLC | Enzyme-IIIglc is part of the glucose phosphotransferase system of Escherichia coli |
| IJA | International Journal of Astrobiology |
| IJB | International Journal of Biology |
| ILBP | Ileal Lipid-Binding Protein |
| IMB | Institute for Mind and Biology |
| IMBG | Institute of Metals in Biology of Grenoble |
| IMBR | Indio Maiz Biological Reserve |
| IMBR | Institute of Marine Biological Research |
| IMBR | Institute of Marine Biological Resources |
| IMISWG | Inter-Ministry Invasive Species Working Group |
| IMPB | Institute of Mathematical Problems of Biology |
| IMSB | Institute of Molecular Systems Biology |