Space transport engineering, spaceflight engineering, astronautics, astronautical engineering, cosmonautics, rocketry, spacecraft, rockets and missiles.
| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| JPL | Jet Propulsion Laboratory | In English | → Research institutes | 
| JPOC | JSC (Johnson Space Center) Payload Operations Center | In English | |
| JSAR | Journal of Space Astronomy Research | In English | → Serial publications, periodicals → Astronomy  | 
| JSASJ | Japan Society of Aeronautical Space Sciences Journal | In English | → Serial publications, periodicals → Aeronautics, aircraft  | 
| JSASS | Japan Society of Aeronautical Space Sciences | In English | → Organizations and associations → Aeronautics, aircraft  | 
| JSAST | Japan Society of Aeronautical Space Sciences Transactions | In English | → Serial publications, periodicals → Aeronautics, aircraft  | 
| JSC | Johnson Space Center (www.jsc.nasa.gov) | In English | |
| JSCM | JSC (Johnson Space Center) Manual | In English | |
| JSLWG | Joint Spacelab Working GRoup | In English | |
| JSpRo | Journal of Spacecraft and Rockets | In English | → Serial publications, periodicals | 
| JSpT | Journal of Spacecraft Technology | In English | → Serial publications, periodicals | 
| KAPL | KSC (Kennedy Space Center) Approved Parts List | In English | |
| KAPN | KSC (Kennedy Space Center) Automated Payloads Notice | In English | |
| KAPPS | KSC (Kennedy Space Center) Automated Payloads Project Specification | In English | |
| KATS | KSC (Kennedy Space Center) Avionics Test Set | In English | → Aeronautics, aircraft | 
| KBAC | Kennedy Booster Assembly Contractor | In English | |
| KCR | KSC (Kennedy Space Center) Change Request | In English | |
| KDS | Kennedy-Developed Software | In English | → Software | 
| KHB | KSC (Kennedy Space Center) Handbook | In English | |
| KIMS | KSC (Kennedy Space Center) Inventory Management System | In English | → Maintenance and logistics → United States  | 
| KMI | KSC (Kennedy Space Center) Management Instruction | In English | → Management | 
| KN | KSC (Kennedy Space Center) Notice | In English | |
| KOI | KSC (Kennedy Space Center) Operation Instruction | In English | |
| KOM | KSC (Kennedy Space Center) Organizational Manual | In English | |
| KOSC | Kennedy Operations Support Center | In English | |
| KPD | KSC (Kennedy Space Center) Program Directive | In English | |
| KPRD | KSC (Kennedy Space Center) Program Requirements Document | In English | |
| KSC | Kennedy Space Center | In English | |
| KSCAP | Kennedy Space Center Area Permit | In English | |
| KSLM | KSC (Kennedy Space Center) Spacelab Plan/Requirement | In English | |
| KSLN | KSC (Kennedy Space Center) Spacelab Notice | In English | |
| KSLPS | KSC (Kennedy Space Center) Spacelab Project Specification | In English | |
| KSM | KSC (Kennedy Space Center) Shuttle Management Document | In English | |
| KSPN | KSC (Kennedy Space Center) Shuttle Project Notice | In English | |
| KSPS | KSC (Kennedy Space Center) Shuttle Project Specification | In English | |
| KSSS | KSC (Kennedy Space Center) Shuttle Project Station Set Specification | In English | |
| KSSS | KSC (Kennedy Space Center) Station Set Specification | In English | |
| L&D | Landing and Deceleration | In English | → Aeronautics, aircraft | 
| L&L | Launch and Landing | In English | |
| L&LS | Launch and Landing Site | In English | |
| LA | Launch Area | In English | |
| LA | Launch Azimuth | In English | |
| LACB | Landing Aids Control Building | In English | → Aeronautics, aircraft | 
| LAGEOS | LAser GEOdynamics Satellite (http://https://lageos.cddis.eosdis.nasa.gov/) | In English | → Geodesy, cartography → United States  | 
| LAGS | Launch Abort Guide Simulation | In English | → Computer simulation | 
| LAIU | Launch Abort Interface Unit | In English | → Human-computer interaction | 
| LAM | Low-Altitude Mission | In English | |
| LaRC | (NASA) Langley Research Center (www.larc.nasa.gov) | In English | → Research institutes → Astronomy → United States  | 
| LASERCOM | Laser Communications Payload | In English | → Optics | 
| LASS | Large-Amplitude Space Simulator | In English | → Astronomy | 
| LBTB | Launch Base Test Plan | In English | |
| LBTPP | Launch Base Test Plan/Procedure | In English | |
| LC | Launch Complex | In English | |
| LC | Launch Cost | In English | → Prices | 
| LC | Launch Countdown | In English | |
| LC&CO | Launch Control and Checkout | In English | |
| LCA | Launch Control Amplifier | In English | |
| LCC | Launch Control Center | In English | |
| LCC | Launch Commit Criteria | In English | |
| LCC | Launch Control Complex | In English | |
| LCCD | Launch Commit Criteria Document | In English | |
| LCE | Launch Complex Engineer | In English | |
| LCE | Launch Complex Equipment | In English | |
| LCMS | Low-Cost Modular Spacecraft | In English | |
| LCROSS | Lunar Crater Observation and Sensing Satellite | In English | → Astronomy | 
| LCS | Launch Control System | In English | |
| LDEC | Lunar Docking Events Controller | In English | |
| LDIU | Launch Data Interface Unit | In English | → Human-computer interaction | 
| LDS | Landing, Deservicing, and Safing | In English | → Aeronautics, aircraft | 
| LDS | Launch Detection Satellite | In English | |
| LEGRI | Low Energy Gamma Ray Imager | In English | → Astronomy | 
| LEH | Launch and Entry Helmet | In English | |
| LEM | Lunar Excursion Module | In English | → Planets and satellites | 
| LEM | Launch Escape Monitor | In English | |
| LEO | Low Earth Orbit | In English | |
| LEOP | Launch and Early Orbit Phase | In English | |
| LES | Launch Equipment Shop | In English | |
| LES | Launch Escape Subsystem | In English | |
| LES | Launch-Entry Suit | In English | |
| LES | Lincoln Experimental Satellite | In English | |
| LETF | Launch Equipment Test Facility | In English | |
| LEV | Lunar Excursion Vehicle | In English | |
| LF | Launch Facility | In English | |
| LFV | Lunar Flying Vehicle | In English | |
| LG | Landing Gear | In English | |
| LGS | Landing Gear Subsystem | In English | |
| LGTA | Landing Gear Test Article | In English | |
| LHOP | Laser-Hardened Optical Payload | In English | → Optics | 
| LISA | Laser Interferometer Space Antenna (http://lisa.nasa.gov) | In English | |
| LLCF | Launch and Landing Computational Facility | In English | → Computer hardware | 
| LLO | Low Lunar Orbit | In English | → Astronomy | 
| LLP | Launch and Landing Project | In English | |
| LLPO | Launch and Landing Project Office | In English | |
| LLS | Launch and Landing Site | In English | |
| LM | Lunar Module | In English | |
| LM&SS | Lunar Mapping and Scientific Survey | In English | → Astronomy | 
| LMDE | Lunar Module Descent Engine | In English | |
| LME | Launch Monitor Equipment | In English | → Aeronautics, aircraft | 
| LMF | Lower Mid Fuselage | In English | → Aeronautics, aircraft | 
| LMSC | Lockheed Missiles And Space Corporation | In English | → Military engineering | 
| LMSS | Lunar Mapping and Survey System | In English | → Astronomy | 
| LMSS | Land Mobile Satellite System | In English | |
| LOA | Landing Operations Area | In English | → Aeronautics, aircraft | 
| LOA | Launch Operations Area | In English | |
| LOB | Launch Operations Building | In English | |
| LOC | Launch Operations Center | In English | |
| LOC | Launch Operations Complex | In English | |
| LOC | Launch Operations Contractor | In English | |
| LOCB | Launch Operations Control BUilding | In English | |
| LOD | Launch Operations Directorate | In English | |
| LOD | Launch Operations Division | In English | |
| LOD | Launch Order Document | In English | |
| LOI | Lunar Orbit Insertion | In English | → Astronomy | 
| LON | Launch On Need | In English | |
| LOO | Launch Operations Orders | In English | |
| LOP | Launch Operations Panel | In English | |
| LOR | Lunar Orbit Rendezvous | In English | → Astronomy | 
| LOSP | Landing Operations Support Panel | In English | → Aeronautics, aircraft | 
| LOSS | Lunar Orbital Space Station | In English | |
| LOWG | Landing Operations Working Group | In English | → Aeronautics, aircraft | 
| LPD | Landing Point Designator | In English | → Aeronautics, aircraft | 
| LPD | Launch Preparation Document | In English | |
| LPD | Launch Procedure Document | In English | |
| LPG | Liquid-Propellant Gun | In English | |
| LPIF | Launch Package Integration Facility | In English | |
| LPLWS | Launch Pad Lightning Warning System | In English | → Meteorology, climatology | 
| LPS | Launch Processing System | In English | |
| LR | Luft und Raumfahrt | In German | → Serial publications, periodicals → Aeronautics, aircraft  | 
| LRB | Liquid Rocket Booster | In English | |
| LRD | Launch Recovery Division | In English | |
| LRD | Launch Requirements Document | In English | |
| LRE | Liquid Rocket Engine | In English | |
| LRES | Liquid Rocket Engine Stability Program | In English | |
| LRF | Liquid Rocket Fuel | In English | |
| LRO | Lunar Reconnaissance Orbiter | In English | → Astronomy | 
| LRR | Launch Readiness Review | In English | |
| LRV | Launch Readiness Verification | In English | |
| LRV | Lunar Roving Vehicle | In English | → Vehicle engineering | 
| LRW | Left Rendezvous Window | In English | |
| LS | Landing Site | In English | |
| LS | Launch Sequence | In English | |
| LS | Launch Site | In English | |
| LS/PPF | Launch Site PAyload Processing Facility | In English | |
| LSA | Launch Services Agreement | In English | |
| LSAH | Launch Site Accommodations Handbook | In English | |
| LSAP | Launch Sequence Applications Program | In English | |
| LSB | Launch Support Building | In English | |
| LSIC | Launch Support Integration Contractor | In English | |
| LSIC | Launch System Integration Contractor | In English | |
| LSID | Launch Sequence and Interlock Document | In English | |
| LSO | Landing Support Officer | In English | |
| LSOC | Launch Support Operations Contractor | In English | |
| LSOC | Lockheed Space Operations Company | In English | |
| LSPDF | Life Science Payload Development Facility | In English | → Biological sciences | 
| LSR | Launch Site Recovery | In English | |
| LSR | Launch Support Request | In English | |
| LSS | Landing and Separation Simulator | In English | |
| LSS | Large Space Structure | In English | |
| LSSL | Life Sciences Space Laboratory | In English | → Research institutes → Biological sciences  | 
| LSSRC | Life Sciences Shuttle Research Centrifuge | In English | → Biological sciences | 
| LSTE | Launch Site Transportation Equipment | In English | → Transport and postal services | 
| LSTS | Launch Site Test Set | In English | |
| LTV | Lunar Transfer Vehicle | In English | → Vehicle engineering | 
| LuRaQ | Luft und Raumfahrt Quarter | In German | → Serial publications, periodicals → Aeronautics, aircraft  | 
| LUT | Launch Umbilical Tower | In English | |
| LVDC | Launch Vehicle Digital Computer | In English | → Computer hardware | 
| LVFRR | Launch Vehicle Flight Readiness Review | In English | → Aeronautics, aircraft | 
| LVIP | Launch Vehicle Integration Plan | In English | → Aeronautics, aircraft | 
| LVO | Launch Vehicle Operations | In English | → Aeronautics, aircraft | 
| LVS | Launch Vehicle Simulator | In English | → Aeronautics, aircraft | 
| LWD | Launch Window Display | In English | |
| MACS | Modular Attitude Control System | In English | |
| MADCS | Modular Attitude Determination and Control System | In English | |
| MAE | Mechanical and Aerospace Engineering | In English | → Mechanical engineering → Aeronautics, aircraft  | 
| MAEP | Minimum Autoland Entry Point | In English | → Aeronautics, aircraft | 
| MAGSAT | Magnetometer Satellite | In English | → Physics → Earth sciences  | 
| MAL | Mobile Airlock | In English | → Aeronautics, aircraft | 
| MAN | Microwave Aerospace Navigation | In English | → Aeronautics, aircraft | 
| MAPS | Measurement of Air Pollution from Satellites | In English | → Environmental protection → Meteorology, climatology  | 
| MARS | Manned Astronautical Research Station | In English | → Research institutes | 
| MAS | Medium-Altitude Sensor | In English | → Aeronautics, aircraft | 
| MASDC | Military Aircraft Storage and Disposition Center | In English | → Military engineering → Aeronautics, aircraft  | 
| MASSPO | Manned Spaceflight Support Project Office | In English | |
| MBAC | Marshall Booster Assembly Contractor | In English | |
| MCA | Maximum Crossing Altitude | In English | → Aeronautics, aircraft | 
| MCT | Maximum Climb Thrust | In English | → Aeronautics, aircraft | 
| MDRS | Mars Desert Research Station | In English | → Astronomy | 
| MECSLSI | Mission Equipment Cargo Shuttle Launch Site | In English | |
| MEM | Mars Excursion Module | In English | |
| MEM | Meteoroid Exposure Module | In English | → Astronomy | 
| MEMMS | Modélisation des Écosystemes Marins et Monitoring par Satellites | In French | → Threats to the environment → Marine research, oceanography  | 
| MEO | Mid Earth Orbit | In English | → Astronomy | 
| MEP | Main Engine Propellant | In English | |
| MERSAT | Meteorology and Earth Observation Satellite | In English | → Earth sciences → Meteorology, climatology  | 
| MESELSI | Mission Extension Shuttle Equipment Launch Site | In English | |
| MESELSI | Mission Extension Support Equipment Launch Site | In English | |
| MESSIAN | Methods for the Efficient Simulation of Aircraft engine Noise | In English | → Acoustics → Aeronautics, aircraft  | 
| MESSOC | Model Evaluation of Space Station Operations Cost | In English | → Prices | 
| MEV | Mars Excursion Vehicle | In English | → Planets and satellites | 
| MFA | Manned Flight Awareness | In English |