| Acronym | Meaning |
 | LCT | Launch Countdown |
 | LCU | Inertial Components Temperature Controller |
 | LCU | Line Coupling Unit |
 | LCUG | Liquid Cooling Under Garment |
 | LCVG | Liquid Cooling And Ventilation Garment |
 | LCVG | Liquid Cooling And Ventilation Garment |
 | LD | Lateral Direction |
 | LD | LatLoading Dock |
 | LDB | LauLogistics Data Bank |
 | LDB | Launch Data Bus |
 | LDEC | Lunar Docking Events Controller |
 | LDEF | Long Duration ExPosure Facility |
 | LDG | Landing |
 | LDIU | Launch Data Interface Unit |
 | LDMK | Landmark |
 | LDR | Low Data Rate |
 | LDR | LowData Rate |
 | LDS | LanLanding |
 | LDS | Landing/Deceleration Subsystem |
 | LDS | LanLoads |
 | LDT | Linear Displacement Transducer |
 | LE | LauLeading Edge |
 | LE | Launch Escape |
 | LEA | Logistics Engineering Analysis (Analyses) |
 | LEB | Lower Equipment Bay |
 | LEC | Lockheed Electronics Company |
 | LED | Light Emitting Diode |
 | LED | Light-emitting Diode |
 | LEH | Launch/Entry Helmet |
 | LEM | Laboratory Environment Model |
 | LEM | Launch Escape Monitor |
 | LEO | Low Earth Orbit |
 | LER | Long Eye Relief (Optics) |
 | LERC | Lewis Research Center (Cleveland |
 | LES | Launch Equipment Shop |
 | LES | Launch Escape Subsystem |
 | LESS | Leading Edge Structure Subsystem |
 | LESS | Leading Edge Structure Subsystem |
 | LESS | Leading Edge Subsystem |
 | LETF | Launch Equipment Test Facility |
 | LETF | Launch Equipment Test Facility (KSC) |
 | LF | Launch Facility |
 | LF | Launch Forward |
 | LF | Left Forward |
 | LF | Load Factor |
 | LF | Low Frequency |
 | LFAF | Low Frequency Accelerometer Flutter |
 | LFAM | Low Frequency Accelerometer Modes |
 | LFAP | Low Frequency Accelerometer Pogo |
 | LFC | Large Format Camera |