| Abbreviation | Definition |
|---|---|
| MSHI | Mount St Helens Institute |
| MSI | Manufacturing Skill Institute |
| MSI | Marine Science Institute |
| MSI | Minnesota Supercomputing Institute |
| MSI | Minority Serving Institutions |
| MSIPI | Mid South Intellectual Property Institute |
| MSIPI | Mir Samsul Islam Polytechnic Institute |
| MSIW | Mathematical Science Institute Workshops |
| MSMEDI | Micro Small and Medium Enterprises Development Institute |
| MSMEDI | Micro Small Medium Enterprises Development Institute |
| MSRI | Malaysian Social Research Institute |
| MSRI | Marine Science Research Institute |
| MSRI | Mathematical Sciences Research Institute |
| MSRI | Mountain Societies Research Institute |
| MSSI | Materials and Surface Science Institute |
| MSSI | Medieval Slavic Summer Institute |
| MSSI | Melbourne Sustainable Society Institute |
| MSTI | Makati Science Technology Institute |
| MTCI | Mediation Training Consultation Institute |
| MTI | Manatee Technical Institute |