| Abbreviation | Definition |
|---|---|
| MJC | Modular Jack Cable |
| MJT | Modular Jack Terminal |
| MJU | Modular Jack Unit |
| MLC | Multiple Level Cell |
| MLE | Metropolitan Line Extension |
| M-LEAD | Mouth Lead |
| MLHG | Multi-Line Hunt Group |
| MLM | Multi-Longitudinal Mode |
| mLMS | Mobile Learning Management System |
| MLP | Mobile Location Protocol |
| MLTS | Multi Line Telephone Systems |
| M-M | Multiplex - Multicast |
| MMC | Minimum Monthly Charge |
| MMCH | Multi-Hybrid Mode Corrugated Horn (antenna) |
| MMDS | Multichannel Multipoint Distribution Service |
| MMDS | Multi-Media Data Services |
| MMDX | Multi-Media Data Services |
| MME | Mobility Management Entity |
| MMJ | Modified Modular Jack |
| MMK | Mobile Money Kit |