| Abbreviation | Definition |
|---|---|
| MARB | Museums Archives and Rare Books |
| MARM | Manitoba Amateur Radio Museum |
| MARP | Museum Alliance Reciprocal Program |
| MARS | Museum Astronomical Resource Society |
| MAS | Museum aan de Stroom |
| MASM | Montrose Air Station Museum |
| MATM | Morning at the Museum |
| MATM | Museum of Arts and Traditions of Morocco |
| MBD | Museum of Biological Diversity |
| MBHT | Museum of Business History and Technology |
| MBIE | Museum for Black Innovation and Entrepreneurship |
| MCA | Museum of Contemporary Art |
| MCAC | McMichael Canadian Art Collection (Kleinburg, ON) |
| MCAD | Museums and Cultural Affairs Department |
| MCAM | Mills College Art Museum |
| MCAM | Ming Contemporary Art Museum |
| MCHM | Macon County Historical Museum |
| MCI | Museum Conservation Institute |
| MCLM | Marine Corps Legacy Museum |
| MCLM | Mayme A Clayton Library and Museum |