| Acronym | Definition |
|---|
| MASD | Montoursville Area School District (Montoursville, PA) |
| MASD | Mutually Assured Self-Destruction (doctrine) |
| MASD | Meyersdale Area School District (Pennsylvania) |
| MASD | Mechanicsburg Area School District (Pennsylvania) |
| MASD | McKeesport Area School District |
| MASD | Moisture-Associated Skin Damage |
| MASD | Mohawk Area School District (Pennsylvania) |
| MASD | Mercer Area School District (Pennsylvania) |
| MASD | Mars Area School District (Pennsylvania) |
| MASD | Mukwonago Area School District (Wisconsin) |
| MASD | Military Aircraft Storage and Disposition |
| MASD | Military Assistance to Stabilisation and Development (UK) |