| Abbreviation | Definition |
|---|---|
| MDFI | Maguindanaon Development Foundation Inc |
| MDG | Michaud-Duffy Group, L.L.P. |
| MDGI | Mercury Data Group Inc |
| MDGI | Metropolitan Design Group Inc |
| MDGPPK | Medgroup, Inc. |
| MDH | Mahashian Di Haddi |
| MDH | Mid Digital Hair |
| MDHC | Mersey Docks and Harbour Company |
| MDI | Management Data Inc |
| MDI | Manufacturers Distributor Inc |
| MDI | Material Distributors Inc |
| MDI | Mechanical Dynamics, Inc. ( Ann Arbor, Michigan) |
| MDI | Modular Devices Inc |
| MDII | Medical Discounts International, Inc. |
| MDIL | Mawer Direct Investing Ltd |
| MDIL | Mother Dairy India Ltd |
| MDL | Molecular Diagnostic Laboratories |
| MDLZ | Mon'delez (food company) |
| MDM | Murray Design & Manufacturing Corporation |
| MDMG | Markham Development Management Group |