MGSS
| 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) |