| Acronym | Definition |
|---|
| MBAS➣Methylene-Blue active Substances |
| MBAS➣Melbourne Blues Appreciation Society (club; Melbourne, Victoria, Australia) |
| MBAS➣Malted Barley Appreciation Society (Brooklyn, NY) |
| MBAS➣Mercury Bay Area School (New Zealand) |
| MBAS➣Molecular and Biological Agricultural Sciences (Taiwan International Graduate Program; Taiwan) |
| MBAS➣Madison Biblical Archaeology Society (est. 1967; Madison, WI) |
| MBAS➣Moriches Bay Audubon Society (New York) |