| Abbreviation | Definition |
|---|---|
| ILI | Interfaith Leadership Institutes |
| ILI | International Language Institute |
| ILI | International Law Institute |
| ILI | International Leadership Institute |
| ILI | International Lignin Institute |
| ILI | Irish Landscape Institute |
| ILIN | Institute for Learning and Innovation in Networks |
| ILJB | Institute for Living Judaism in Brooklyn |
| ILLC | Institute for Logic Language Computation |
| ILLF | Institute of Lithuanian Literature and Folklore |
| ILLT | Institute of Linguistics and Language Technology |
| ILM | Institute of Leadership and Management |
| ILM | Institute of Logistical Management |
| ILMI | Indigenous Land Management Institute |
| ILMI | Integrated Land Management Institute |
| ILPA | Institute for Law and Public Affairs |
| ILR | Institute of Learning in Retirement |
| ILRS | Institute of Legal research and standards |
| ILRT | Institute of Livelihood Research and Training |
| ILS | Institute for Legal Studies |