| Acronym | Definition |
|---|
| MGAS➣Motor Gasoline (US Navy) |
| MGAS➣Mineralogisch Geologischer Arbeitskreis Saar eV (German: Saar Mineralogical Geological Working Group; Saarland, Germany) |
| MGAS➣Middle Georgia Astronomical Society |
| MGAS➣Mountsorrel Gas Appliance Services (UK) |