| Abbreviation | Definition |
|---|---|
| MLI | Mountain Language Institute |
| MLI | Multicultural Leadership Institute |
| MLSI | Middle Learning Summer Institute |
| MMCI | Mariano Moreno Culinary Institute |
| MMCI | Midwest Maternal Child Institute |
| MMI | Maryland Musculoskeletal Institute |
| MMI | Munroe Meyer Institute |
| MMPI | Massachusetts Medicaid Policy Institute |
| MMRI | Maryland Medical Research Institute |
| MMSI | Meredith Mathematics Science Institutes |
| MMTI | Madras Management Training Institute |
| MMTI | Mideast Management Training Institute |
| MMTI | Multi-Media Training Institute |
| MNI | Michigan Neuroscience Institute |
| MNIMBS | Michigan Nanotechnology Institute for Medicine and Biological Sciences (Ann Arbor, MI) |
| MNIS | Member of the Nigerian Institution of Surveyors |
| MNIST | Mixed National Institute of Standards and Technology |
| MNIST | Modified National Institute of Standards and Technology |
| MNIT | Malaviya National Institute of Technology, |
| MOBI | My Own Business Institute |