| Abbreviation | Definition |
|---|---|
| LIMARC | Long Island Mobile Amateur Radio Club |
| LMS | Low-Mast System |
| LOTW | Logbook Of The World |
| LP | Low-Power |
| LPFM | Low-Power Frequency Modulation |
| LPI | Low Power Interference |
| LPRC | Loma Pioneer Repeater Club |
| LPRF | Low-Power Radio Frequency |
| LR | Local Repeater |
| LSB | Local Station Board |
| LSB | Lower SideBand |
| LVDS | Low-Voltage Differential Signalling |
| LWS | Long-Wave Set |
| MAARS | Manhattan Area Amateur Radio Society |
| MACS | Michigan Amateur Communications System |
| MAGMOUNT | Magnetic Mount |
| MAR | Mayland Amateur Radio |
| MARAC | Mobile Amateur Radio Awards Club |
| MARC | Mid-Atlantic Amateur Radio Club |
| MARC | Mobile Amateur Radio Corps |