| Management Development Institute, Gurgaon | Academic & Science |
| Makurdi | Airport Code |
| Mechanical Dynamics, Inc. ( Ann Arbor, Michigan) | Business |
| Management Data Inc | Business |
| Major Drilling Group International Incorporated | Business |
| Middle Island Resources Limited | Business |
| Material Distributors Inc | Business |
| Manufacturers Distributor Inc | Business |
| Modular Devices Inc | Business |
| Management Development Institute | Business Management |
| Management Directions Inc | Business Management |
| Methylene Diphenyl Diisocyanate | Chemistry |
| Mule Deer Initiative | Community |
| Management Development International | Community |
| Mediterranean Development Initiative | Community |
| Ministry Development Institute | Community |
| Medium Dependent Interface | Computer and Networking |
| Multi Drawing Interface | Computing |
| Meta Data Interchange | Computing |
| Media Dependant Interface | Computing |
| Machine Debugger Interface | Computing |
| Mobile Data Initiative | Computing |
| Map Definition | Computing |
| Media Delivery Index | Computing |
| Manual Data Input | Computing |
| Multilevel Document Interface | Computing |
| Multi Document Interface | Computing |
| Manual Data Interface | Database Management |
| Mazda Digital Innovation | General |
| Motor Development International | General |
| Media Device Interface | General |
| Mobile Device Interface | General |
| Multi Device Interface | General |
| Multiple Direct Injection | General |
| Multi Diagnostic Interface | General |
| Magiera Diesel Injection | General |
| Mercedes Benz Distribution Indonesia | General |
| Modern Direct Injection | General |
| Medium Duty Incomplete Vehicle | General |
| Microsoft Document Imaging | General |
| Media Design Imaging | General |
| Minnesota Diversified Industries | General |
| Maximum Demand Indicator | General |
| Mahindra direct injection | General |
| Mentor Discover Inspire | General |
| Material Design Icons | General |
| Mark Dunning Industries | General |
| Multiple Diagnostic Interface | General |
| Metered Dose Inhalers | General |
| Massachusetts Downtown Initiative | General |
| Mercury Displacement Industries | General |
| Mainframe Data Integration | General |
| Model Driven Integration | General |
| Maximum Demand and It | General |
| Managing for Daily Improvement | General |
| Mentor Discover and Inspire | General |
| Materials Design Innovation | General |
| Mental Developmental Index | General |
| Mean Decrease Impurity | General |
| Modernized Demolition Initiators | General |
| Medically Determinable Impairment | Governmental |
| Medicolegal Death Investigation | Governmental |
| Media Diversity Institute | Governmental |
| Massive Data Institute | Governmental |
| Minority Depository Institutions | Governmental |
| Multiple Document Interface | Information Technology |
| Mythic Dungeon International | International |
| Measured Dose Inhaler | Medical |
| Medical Data Integration | Medical |
| Multiple Dose Inhaler | Medical |
| Manic Depressive Illness | Medical |
| Multi-Directional Instability | Medical |
| Medical Dimensions Incorporated | Medical |
| Multiple Daily Injections | Medical |
| Medical Diagnostic Imaging | Medical |
| Metered-Dose Inhaler | Medical |
| Medical Director Institute | Medical |
| Multiple Drug Intake | Medical |
| Modernized Demolition Initiator | Military and Defence |
| Multipurpose Display Indicators | Military and Defence |
| Medium Dependant Interface | Networking |
| Media Dependent Interface | Networking |
| Mesh Direction Insensitive | Physics Related |
| Mount Desert Island | Regional |
| Microsoft Document Image | Softwares |
| Michelson Doppler Imager | Space Science |