| Abbreviation | Definition |
|---|---|
| ILS | Institute of Liturgical Studies |
| ILSE | Institute for Life Science Entrepreneurship |
| ILSI | Institute for Large Scale Innovation |
| ILSI | International Life Science Institute |
| ILSI | International Life Sciences Institute |
| ILSP | Institute for Language and Speech Processing |
| ILST | Institute for Leadership in Sustainable Technology |
| ILST | Institution Level Support Team |
| ILT | Institute for Law and Technology |
| ILT | Institute for Leadership Training |
| ILT | Institute for Learning Technologies |
| ILT | Institute of Lutheran Theology |
| ILTI | International Literacy Training Institute |
| ILTM | Institute of Learning and Teaching Member |
| ILTS | Institute of Low Temperature Science |
| ILU | Institute of London Underwriters |
| ILW | Institute for Land Warfare |
| ILW | Institute for Law and the Workplace |
| IM | Institute of Medicine |
| IMAD | Institute of Macroeconomic Analysis and Development |