| Acronym | Meaning |
 | M | Middle |
| M | Million |
| M | Missing (Data) |
| M | Monitor (MON Preferred) |
| M | Number Of Revolutions Required For The Rendezvous |
| M | Isc Miscel Laneous |
| M | LGS Microwave Landing Guidance System |
| M | Lss Mission |
| M | LAMDM Launch Aft |
| M | LAMonochrome Lens Assembly |
| M | PSS Main Parachute Support Structure |
| M | B/SMegabits Per Second |
| M | BACMarshall Booster Assembly Contractor |
| M | DSDMate/Demate Stiffleg Derrick |
| M | ECCA Master Electrical Common Connector Assembly |
| M | ESAMiniature Electrostatic Accelerometer |
| M | ESAModular Equipment Stowage Assembly |
| M | Icom Missile Command (Army) |
| M | ITTSE Mobile Lgor Tracking Telescope System |
| M | LcsManagement Information And Control System |
| M | PTPMain Propulsion Test Program |
| M | PTSMultipurpose Tool Set |
| M&C | Maintenance And Checkout |
| M&C | Monitor And Control Panel |
| M&F | Materials And Facilities |
| M&M | Materials And Maintenance |
| M&O | Maintenance And Operations |
| M&P | Materials And Processes |
| M&R | Maintenance And Refurbishment |
| M&R | Maintenance And Repair |
| M&RF | Maintenance And Refurbishing Facility |
| M+R | Maintenance And Refurbishment |
| M+R | Maintenance And Repair |
| M+R | Time In Days Before Move Operations |
| M-KG | Meter-Kilogram |
| M-M-L-S | Model-Modes-Loads-Stresses |
| M/F | Maintenance Factor |
| M/I | Minimum Impulse |
| M/L | Maintenance Loop |
| M/LR | Maintenance Loop Recorder |
| M/P | Main Parachute |
| M/R | Mixture Ratio (Fuel To Oxidizer) |
| M/S | Measurement Stimuli |
| M/SCI | Mission/Safety Critical Item |
| M/U | Mockup |
| M50 | Mean Of 1950 (Coordinate System) |
| MA | Maintenance (STS) |
| MA | Maintenance Ability |
| MA | Master |
| MA | Master Alarm |
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