| Acronym | Definition |
|---|
| MD | Maryland (US postal abbreviation) |
| MD | Muscular Dystrophy |
| MD | Medicinae Doctor (Doctor of Medicine) |
| MD | Medical Director |
| MD | Medical Doctor |
| MD | Major Depression |
| MD | Medical Department |
| MD | Mode (DSC) |
| MD | Missing Data (statistics) |
| MD | Mini Disc |
| MD | Master's Degree |
| MD | Marketing Director |
| MD | Mother's Day |
| MD | Management Division |
| MD | Managing Director |
| MD | Memorial Day |
| MD | Molecular Dynamics |
| MD | Moldova (ISO country identifier) |
| MD | Mason-Dixon (Civil War era boundary between Pennsylvania and Maryland) |
| MD | Music Director |
| MD | Message Digest |
| MD | Mass Destruction |
| MD | Magdeburg (German license plate code) |
| MD | Mailed |
| MD | Mandatory (band) |
| MD | Motor Drive |
| MD | Modern Drummer (magazine) |
| MD | McDonnell-Douglas |
| MD | Machine Direction |
| MD | Mega Drive (Sega) |
| MD | Miles Davis |
| MD | Macular Degeneration |
| MD | Music Department |
| MD | Missile Defense |
| MD | Mendoza (Argentina province, airline code) |
| MD | Multi-Dimensional |
| MD | Metal Detector |
| MD | Miami-Dade (Miami-Dade County, Fl) |
| MD | Musical Director |
| MD | McDonalds |
| MD | Manic Depression |
| MD | Military District |
| MD | Management Directive |
| MD | Michael Douglas |
| MD | Mandarina Duck |
| MD | Matt Damon (actor) |
| MD | Multiple Description |
| MD | Mountain Dew |
| MD | Megadeth (band) |
| MD | Metropolitan District (UK) |
| MD | Microdrive |
| MD | Multi-Destination (Sprint) |
| MD | Model Design |
| MD | Duration Magnitude (US Geological Survey; used to compute earthquake size based on shake time) |
| MD | Mini Disk |
| MD | Mail Drop |
| MD | Millennium Declaration |
| MD | Machine Dependent |
| MD | Main Deck |
| MD | Mendelevium |
| MD | Air Madagascar (IATA airline code) |
| MD | Minimum Distance (algorithm) |
| MD | Madhuri Dixit (Indian actress) |
| MD | Million Dead (band) |
| MD | Management Domain |
| MD | Make Directory (MS-DOS command) |
| MD | Mando Diao (band) |
| MD | Materials Division (American Society of Mechanical Engineers) |
| MD | Monochrome Display |
| MD | Magnetic Disk |
| MD | Mucosal Disease (bovine viral disease) |
| MD | Mean Deviation |
| MD | Man-Day |
| MD | Mission Data |
| MD | Measured Depth (oil and gas) |
| MD | Marek's Disease (chicken virus) |
| MD | Mortgage Deed |
| MD | Main Droite (accoridion, right hand side) |
| MD | Mission-Design |
| MD | Metadata Database |
| MD | Mentally Deficient |
| MD | Master of Disaster |
| MD | Mandatory Death (band) |
| MD | Mean Diffusivity |
| MD | Mission Duration |
| MD | Mail Destination |
| MD | Maximum Demand |
| MD | Mudug (postal region, Somalia) |
| MD | Middle Dutch |
| MD | Master Document |
| MD | Magistratsdirektion (German: municipality directorate) |
| MD | Mighty Dog (dog food) |
| MD | Months After Date |
| MD | Minor Defect |
| MD | Mister Donut (restaurant) |
| MD | Membrane Distillation |
| MD | Materiel Development |
| MD | Mogen David (wine) |
| MD | Manufacture Discontinued (AT&T) |
| MD | Meter Dose (inhaler devices) |
| MD | Magical Drop (SNK game) |
| MD | Mass Driver (Gundam seed anime) |
| MD | Milestone Decision |
| MD | Modulation Depth |
| MD | Morphologic Diagnosis (histopathology) |
| MD | Mediation Device |
| MD | Maritime Division |
| mD | Millidarcy (measure of permeability) |
| MD | Maintenance Diagnostic |
| MD | Methyldichloroarsine |
| MD | Mine Disposal |
| MD | Mechanized Division |
| MD | Microwave Drying |
| MD | Munitions Dump |
| MD | Mobilization/Deployment |
| MD | Multivariate Distribution |
| MD | Messenger Discovery |
| MD | Monocular Deprivation |
| MD | Materiel Developer |
| MD | Manning Document |
| MD | Missionary Department |
| MD | Matrix Diagram (Sprint - Quality) |
| MD | Miller Draft |
| MD | Muy Deficiente (Spanish educational grade/mark) |
| MD | Measurement Difference |
| MD | Manufacturer Defined |
| MD | Modernization Division (Forecast Systems Laboratory, NOAA) |
| MD | Motorized Damper (HVAC drawings) |
| MD | Module Designer (gaming) |
| MD | Ministria e Drejtësisë (Ministry of Justice, Albania) |
| MD | Machinery Damage (insurance) |
| MD | Mean Downtime |
| MD | Mega Day |
| MD | Measurable Development (Northern Vantage, Inc.) |
| MD | Maintenance Drop |
| MD | Maintainability Demonstration |
| MD | Mine Disc (gaming) |
| MD | Movement Directive |
| MD | Manipulative Deception |
| MD | Microphone Doctor |
| MD | Material Defender (Descent game series) |
| MD | Methodology Deliverable |
| MD | Modificador Directo (Spanish grammar) |
| MD | Meridian Day |
| MD | MediaDriven |
| MD | Mill Desk (Home Depot) |
| MD | Middle Danish |
| MD | Municipal Docks Railway (of the Jacksonville Port Authority) |
| MD | Mnemonic Debugger (firmware-level diagnostic environment used in Apollo Computers) |
| MD | Marshalled Deployability |
| MD | Microwave Denitrification |
| MD | Moderator Detritiation |
| MD | Metropolitan Dairies |
| MD | Mouth Dissoving (medical tablet) |