| Abbreviation | Definition |
|---|---|
| msl | mean sea level |
| MSM | Million Square Metres |
| MSPS | Mega-Samples Per Second |
| MSU | Million Service Units |
| mSv | Milli-Sievert |
| MT | Measurement Ton |
| MT | Metric Tonnes |
| MT | Metric Tons |
| MT | Million Tonnes |
| MT | Million Tons |
| MTBF | Minutes To Backup Floppies |
| MTC | Metric Ton Of Carbon |
| MTCE | Million Ton of Coal Equivalent |
| MTD | Metric Tonnes Per Day |
| MTOE | Million Tonnes Of Oil Equivalent |
| MTPH | Metric Ton Per Hour |
| MTR | Materials Technology Research |
| MTS | Meters |
| MTS | Metric Ton Of Styrofoam |
| MTU | Main Test Unit |