| Abbreviation | Definition |
|---|---|
| MDML | Micro Devices Metrohm Ltd |
| MDPA | Mobile Device Protection Association |
| MDR | Mojave Desert Racing, Inc. |
| MDR | Mojave Desert Racing, Incorporated |
| MDRC | Manpower Demonstration Research Corporation |
| MDRE | Mark Dowling Real Estate |
| MDRU | Mittal Dhatu Rashayan Udyog |
| MDS | Momentum Data Systems |
| MDSC | Missoula Developmental Service Corporation |
| MDSI | Manufacturing Data Systems, Inc. |
| MDSI | Medical Distribution Solutions Inc |
| MDSI | Metal Design Systems Inc |
| MDSI | Mobile Data Solutions Inc |
| MDSI | Mobile Data Solutions, Inc. |
| MDSI | Monitoring Data Services Inc |
| MDSI | Mountain Data Systems Inc |
| MDSL | Market Data Services Ltd |
| MDSO | Medical Dental Staff Office |
| MDSO | Medical Discount Solutions of Oklahoma |
| MDSS | Marsoft Decision Support System |