| Abbreviation | Definition |
|---|---|
| LEI | Lean Enterprise Institute |
| LEMI | Lay Ecclesial Ministry Institute |
| LEMI | Leadership Education Mentoring Institute |
| LETI | Latino Educational Training Institute |
| LETI | Law Enforcement Training Institute |
| LFBI | Living Faith Bible Institute |
| LFEI | Little Flower Engineering Institute |
| LFEI | Louisiana Free Enterprise Institute |
| LFI | Leadership Fairfax Institute |
| LFI | Lethal Force Institute |
| LGI | Locally Governed Institution |
| LGMI | Lead Global Management Institute |
| LGMI | Light Green Machine Institute |
| LGSI | London Global Strategy Institute |
| LHI | Land Heritage Institute |
| LHI | Lillehei Heart Institute |
| LIA | Laser Institute Of America |
| LIAE | Latvian Institute of Aquatic Ecology |
| LIAE | Lithuanian Institute of Agrarian Economics |
| LIAS | Leuphana Institute for Advanced Studies |