| Acronym | Meaning |
 | JVNTSC | John Volpe National Transportation Systems Center |
| JWG | Joint Working Group |
| K | Potassium |
| K | A Symbol For Planetary Wave Number |
| KAEH | King Air Equivalent Hours |
| KAFB | Kirkland Air Force Base |
| KB | Kilobyte (s) |
| KB | Kilobit(s) |
| KB/S | Kbits/s |
| KBPS | Kilobits (103) Per Second |
| KBYTE | Kilobyte (103) |
| KDP | Potassium Dihydrogen Phosphate |
| KE | Kinetic Energy |
| KELP | Coronal Emission Line Polarimeter |
| KISS | Kanton Island Sounding System |
| KITOON | Combination Kite And Balloon |
| KLOC | Kilolines (103) Of Code |
| KMA | Korean Meteorological Administration |
| KNET/SPARTACUS | N/A |
| KNMI | Koninklijk Nederlands Meteorologisch Instituut |
| KOFSE | Kuwait Oil-Fire Smoke Experiment |
| KOSAMP | Kuwait Oil-Fire Smoke Atmospheric Measurements Program |
| KP | Low Magnetic Activity |
| KP | Geomagnetic Planetary Index |
| KPNO | Kitt Peak National Observatory Arizona |
| KPP | K Profile Parameterization |
| KR | Kilorayleigh |
| KRMS | Ka-band Radiometer Mapping System |
| KSA | Ku-band Single Access |
| KSC | Kennedy Space Center |
| L | Lunar |
| L-DEO | Lamont-Doherty Earth Observatory |
| L2D2 | Lightweight LORAN Digital Dropsonde |
| LA | Longmont Anticyclone |
| LAC | Local Area Coverage |
| LACATE | Lower Atmosphere Composition And Temperature Experiment |
| LACTOZ | N/A |
| LAGEOS | Laser Geodynamics Satellite |
| LAGEOS-2 | Laser Geodynamics Satellite-2 |
| LAI | Leaf Area Index |
| LAM | Limited-area Model |
| LAMBADA | Amazon Basin Experiment |
| LAMMR | Large Antenna Multichannel Microwave Radiometer |
| LAMMR | Large Antenna Multichannel Microwave Radiometer |
| LAMP | Laboratoire Associe De Meteorologie Physique |
| LAMPS | Limited-Area Mesoscale Prediction System |
| LAMSS | Laser Air Motion Sensing System |
| LAN | Local Area Network |
| LANDSAT | Land Remote Sensing Satellite |
| LANL | Los Alamos National Laboratory |
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