| M | Mach | - | Organizations |
| M | Maintainability | - | Organizations |
| M | Major Cycle | - | Organizations |
| M | Male | - | Organizations |
| M | Mandatory | - | Organizations |
| M | Manual | - | Organizations |
| M | Mass | - | Organizations |
| M | Matrix | - | Organizations |
| M | Mega | - | Organizations |
| M | Mercury | - | Organizations |
| M | Meter | - | Organizations |
| M | Middle | - | Organizations |
| M | Million | - | Organizations |
| M | Missing (Data) | - | Organizations |
| M | Monitor (MON Preferred) | - | Organizations |
| M | Number Of Revolutions Required For The Rendezvous | - | Organizations |
| M | Isc Miscel Laneous | - | Organizations |
| M | LGS Microwave Landing Guidance System | - | Organizations |
| M | Lss Mission | - | Organizations |
| M | LAMDM Launch Aft | - | Organizations |
| M | LAMonochrome Lens Assembly | - | Organizations |
| M | PSS Main Parachute Support Structure | - | Organizations |
| M | B/SMegabits Per Second | - | Organizations |
| M | BACMarshall Booster Assembly Contractor | - | Organizations |
| M | DSDMate/Demate Stiffleg Derrick | - | Organizations |
| M | ECCA Master Electrical Common Connector Assembly | - | Organizations |
| M | ESAMiniature Electrostatic Accelerometer | - | Organizations |
| M | ESAModular Equipment Stowage Assembly | - | Organizations |
| M | Icom Missile Command (Army) | - | Organizations |
| M | ITTSE Mobile Lgor Tracking Telescope System | - | Organizations |
| M | LcsManagement Information And Control System | - | Organizations |
| M | PTPMain Propulsion Test Program | - | Organizations |
| M | PTSMultipurpose Tool Set | - | Organizations |
| M&C | Maintenance And Checkout | - | Organizations |
| M&C | Monitor And Control Panel | - | Organizations |
| M&F | Materials And Facilities | - | Organizations |
| M&M | Materials And Maintenance | - | Organizations |
| M&O | Maintenance And Operations | - | Organizations |
| M&P | Materials And Processes | - | Organizations |
| M&R | Maintenance And Refurbishment | - | Organizations |
| M&R | Maintenance And Repair | - | Organizations |
| M&RF | Maintenance And Refurbishing Facility | - | Organizations |
| M+R | Maintenance And Refurbishment | - | Organizations |
| M+R | Maintenance And Repair | - | Organizations |
| M+R | Time In Days Before Move Operations | - | Organizations |
| M-KG | Meter-Kilogram | - | Organizations |
| M-M-L-S | Model-Modes-Loads-Stresses | - | Organizations |
| M/F | Maintenance Factor | - | Organizations |
| M/I | Minimum Impulse | - | Organizations |
| M/L | Maintenance Loop | - | Organizations |
| M/LR | Maintenance Loop Recorder | - | Organizations |
| M/P | Main Parachute | - | Organizations |
| M/R | Mixture Ratio (Fuel To Oxidizer) | - | Organizations |
| M/S | Measurement Stimuli | - | Organizations |
| M/SCI | Mission/Safety Critical Item | - | Organizations |
| M/U | Mockup | - | Organizations |
| M50 | Mean Of 1950 (Coordinate System) | - | Organizations |
| MA | Maintenance (STS) | - | Organizations |
| MA | Maintenance Ability | - | Organizations |
| MA | Master | - | Organizations |
| MA | Master Alarm | - | Organizations |
| MA | Material Authorization | - | Organizations |
| MA | Metabolic Analyzer | - | Organizations |
| MA | Middeck Act | - | Organizations |
| MA | Mike Amplifier | - | Organizations |
| MA | Milliampere | - | Organizations |
| MA | Missed Approach | - | Organizations |
| MA | Mission Analysis | - | Organizations |
| MA | Multiple Access | - | Organizations |
| MA | Multiple-access | - | Organizations |
| MA&P | Maintenance Analysis And Planning | - | Organizations |
| MA&T | Manufacturing Assembly And Test | - | Organizations |
| MAA | Mathematical Association Of America | - | Organizations |
| MAA | Maximum Authorized Altitude | - | Organizations |
| MAA | Mechanical Arm Assembly | - | Organizations |
| MAAB | Materials Application Advisory Board | - | Organizations |
| MAAR | Monthly Associate Administrator's Review | - | Organizations |
| MAB | Master Acquisition Bus | - | Organizations |
| MAB | Materials Advisory Board | - | Organizations |
| MAB | Materials Applications Board | - | Organizations |
| MAB | Mechanical Automation Breadboard | - | Organizations |
| MAB | Missile Assembly Building | - | Organizations |
| MAC | Main Display Console | - | Organizations |
| MAC | Maintenance Advisory Committee | - | Organizations |
| MAC | Maximum Allowable Concentration | - | Organizations |
| MAC | Maximum Concentration Of Organics | - | Organizations |
| MAC | Mean Aerodynamic Chord | - | Organizations |
| MAC | Mean Aerodynamic Chord | - | Organizations |
| MAC | Military Airlift Command | - | Organizations |
| MAC | Multiaccess Computer | - | Organizations |
| MACDS | Monitor And Control Display System | - | Organizations |
| MACE | Mechanical Antenna Control Electronics | - | Organizations |
| MACH | Machine | - | Organizations |
| MACH | Velocity Relative To The Speed Of Sound | - | Organizations |
| MACI | Monitor | - | Organizations |
| MACO | Major Assembly Checkout | - | Organizations |
| MACRO | Merge And Correlate Recorded Output (Program) | - | Organizations |
| MAD | Madrid | - | Organizations |
| MAD | Maintenance Analysis Data | - | Organizations |
| MADC | Multiplexer Analog To Digital Converter | - | Organizations |
