| Abbreviation | Definition |
|---|---|
| LLT | Long Leadtime |
| LM | Left Mid |
| LM | Left Middle |
| LM | Long Module |
| LM | Lunar Module |
| LMAN | Lonian Milesian Alexandrian Numerals |
| LMC | Large Magellanic Cloud |
| LMC | Lightweight MPESS (Mission Peculiar Experiment Support Structure) Carrier |
| LMC | Lightweight MPESS Carrier |
| LME | Launch Monitor Equipment |
| LMF | Lower Mid-Fuselage |
| LMG | Left Main Gear |
| LMK | Landmark |
| LMP | List of Measurement Points |
| LMS | Load Measurement System |
| LMS | Logistics Master Schedule |
| LMS | Logistics Master Schedules |
| LMSC | Lockheed Missiles and Space Corporation |
| LN | Line |
| LN2 | Liquid Nitrogen |