M|
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| MAS | Meteorological Aids Service |
| MAT | Mobile Aeronautical Telemetry |
| MBS | Mobile Broadband System |
| MC | Monte Carlo (methodology) |
| MDS | Multipoint Distribution Service |
| MEO | Medium Earth Orbit (satellite) |
| MERLIN | Multi-Element Radio Linked INterferometer (GB) |
| MES | Mobile Earth Station |
| MESA | Mobility for Emergency and Safety Applications |
| MetA | Meteorological Aid Service |
| METSAT | Meteorological Satellite |
| MetS | Meteorological-Satellite Service |
| MF | Medium Frequency (300 to 3000 kHz) |
| MIDS | Multifunctional Information Distribution System |
| MIFR | Master International Frequency Register |
| MIT | Massachusetts Institute of Technology (USA) |
| ML | Mobile station (in a mobile radio system) |
| MLS | Microwave Landing System |
| MLS | Microwave Limb Sounding |
| MM | Maritime Mobile Service |
| MMARC | Maritime Mobile Radio Conference |
| MMDS | Multimedia Multipoint Distribution System |
| MMS | Maritime Mobile Service |
| MMSS | Maritime Mobile-Satellite Service |
| MNP | Mobile Number Portability |
| MOB | Mobile (use in the designation of certain WARCs) |
| MoU | Memorandum of Understanding |
| MRC | Milestone Review Commitee (CEPT) |
| MRN | Maritime Radionavigation Service |
| MRNS | Maritime Radionavigation Service |
| MRNSS | Maritime Radionavigation-Satellite Service |
| MS | Mobile Service |
| MS | Mobile Station |
| MSA | Meteor Scatter Applications |
| MSS | Mobile Satellite Service |
| MVDS | Multipoint Video Distribution System |
| MWS | Multimedia Wireless Systems |
