| Abbreviation | Definition |
|---|---|
| MCTA | Minal Computer Training Academy |
| MDWG | Member Development Working Group |
| MDWG | Mint Directors Working Group |
| MDWG | Missile Defense Working Group |
| MDWG | Model Development Working Group |
| MDWG | Multi-Disciplinary Working Group |
| MNWG | Maternal and Newborn Working Group |
| MSW | Master of Social Work |
| MVWG | Motor Vehicle Working Group |
| MWG | Merger Working Group |
| MWG | Meteorite Working Group |
| MWG | Modeling Working Group |
| MWWG | Maryland Wind Working Group |
| MWWG | Mixed Waste Working Group |
| MWWG | Murray Wetlands Working Group |
| NIWG | Network Implementation Working Group |
| NIWG | Neutrino Interactions Working Group |
| NIWG | NextGen Integration Working Group |
| NIWG | Numbering Industry Working Group |
| NIWG | Nursing Informatics Working Group |