| Acronym | Definition |
|---|
| MGSS➣McGill Group for Suicide Studies (McGill University) |
| MGSS➣Music Graduate Students' Society (McGill University) |
| MGSS➣Main Gun Signature Simulator |
| MGSS➣Muffler Grade Stainless Steel |
| MGSS➣Malaysian German Students Society |
| MGSS➣Manned Geosynchronous Spacecraft Servicer |
| MGSS➣Mechanical Ground Support System |
| MGSS➣Mahatma Gandhi Secondary School (various locations) |