MDSG
| Acronym | Definition |
|---|---|
| MDSG | Mood Disorders Support Group, Inc. |
| MDSG | Myotonic Dystrophy Support Group (Carlton, England, UK) |
| MDSG | Mineral Deposits Studies Group (Geological Society of London; UK) |
| MDSG | Membership Development Support Grant (various agencies) |
| MDSG | Missile Defense Support Group |
| MDSG | Marketing Director's Support Group (forum) |
| MDSG | Missile Defense Steering Group (Missile Defense Agency) |
| MDSG | Market Development Services Group |