| Abbreviation | Definition |
|---|---|
| MFCMA | Magnuson Fishery Conservation and Management Act |
| MFMT | Maximum Fishing Mortality Threshold |
| MFP | Mobile Flux Platform |
| MGI | Marine Geological Institute |
| MGR | Marine Genetic Resources |
| MHD | MagnetoHydroDynamic |
| MHMS | Modular Hydrologic Modeling System |
| MHPCC | Maui High Performance Computer Center |
| MHWS | Medium High-Water Spring |
| MI | Missing Ice |
| MIAS | Marine Information and Advisory Service |
| MIB | Message In a Bottle |
| MIC | Meteorologist-In-Charge |
| MICE | Man's Impact on Coastal and Estuarine Ecosystems |
| MICIS | Midwestern Climate Information System |
| MICOM | Miami Isopycnic Coordinate Ocean Model |
| MIL | Marine Instrumentation Laboratory |
| MIS | Marine Isotope Stage |
| MIS | Marine Isotopic Stage |
| MIS | Multi-angle Imaging Spectrometer |