| Abbreviation | Definition |
|---|---|
| MCIT | Member Chartered Institute of Transport |
| MCRI | Marine Conservation Research Institute |
| MCRI | Molecular Cardiology Research Institute |
| MCRI | Murdoch Children's Research Institute |
| MCSI | Marine Conservation Science Institute |
| MCTI | Michigan Career and Technical Institute |
| MCTI | Michigan Career Technical Institute |
| MCTI | Monroe Career and Technical Institute |
| MCTI | Muntinlupa City Technical Institute |
| MDAC | Memorandum for Departmental Action |
| MDAI | Miami Dade Advocacy Institute |
| MDI | Massive Data Institute |
| MDI | Media Diversity Institute |
| MDI | Medical Director Institute |
| MDI | Minority Depository Institutions |
| MDIE | Mater Dei Institute of Education |
| MDII | Medical Devices Innovation Institute |
| MDIM | Management Development Institute Murshidabad |
| MDIS | Management Development Institute of Singapore |
| MDPI | Multidisciplinary Digital Publishing Institute |