| MAC | Multimedia Affective Computing 
| Others |
| MAC | Multiple Advanced Computers
| Others |
| MAC | Multiple Analogue Component
| Others |
| MAC | Multiple Architecture Computer
| Others |
| MAC | Multiplexed Analog Components
| Others |
| MAC | Multiplexed Analogue Components
| Others |
| MAC | Multiply Accumulate
| Others |
| MAC | Multiply-Accumulate
| Others |
| MAC | Multnomah Athletic Club
| Others |
| MAC | Muslim Association of Canada
| Others |
| MAC | Mycobacterium Avium Complex
| Others |
| MAC | Mycrobaterium Avian Complex
| Others |
| Mac(k) | Mc-, Mac- (names so beginning)
| Others |
| MAC-10 | Military Armament Corporation - 10
| Others |
| MAC-11 | Military Armament Corporation - 11
| Others |
| MAC-TIME | Modification-, Access- and Change-Time
| Others |
| MACA | Make America Crip Again
| Others |
| MACA | Mid Air Collision Avoidance
| Others |
| MACA | Mid America CropLife Association
| Others |
| MACA | Mid Atlantic Challenge Association
| Others |
| MACA | Mid Atlantic Cobra Association
| Others |
| MACA | Mid-Air Collision Avoidance
| Others |
| MACA | Midtown Assistance Center Atlanta
| Others |
| MACA | Military Aid to the Civil Authorities
| Others |
| MACA | Military Assistance to Civil Authorities
| Others |
| MACA | Mobile Assisted Channel Allocation
| Others |
| MACA | Mongol-American Cultural Association
| Others |
| MACA | Multiple Access with Collision Avoidance
| Others |
| MACA | Multivariate Adaptive Constructed Analogs
| Others |
| MACA | Municipal and Community Affairs
| Others |
| MACA | Museo del Automovil Club Argentino
| Others |
| MACAB | Memory and Aging Community Advisory Board
| Others |
| MACABA | Mandaue City Amateur Basketball Association
| Others |
| MACAM | Master of Arts in Conflict Analysis and Management
| Others |
| MACAM | Model Air Club Athus Messancy
| Others |
| MACAM | Modern and Contemporary Art Museum
| Others |
| MACAN | Mid Atlantic Coastal Acidification Network
| Others |
| MACAN | Modern And Contemporary Arts in Nusantara
| Others |
| MACAR | Metadata Advisory Committee for Australian Repositories
| Others |
| MACAR | Montessori Applied to Children At Risk
| Others |
| MACARIZED | Macarize Macarizes Macarizing
| Others |
| MACARIZED | macarize macarizing
| Others |
| MACAT | Member Association Capacity Assessment Tool
| Others |
| MACAT | Middle school Alternative Classrooms for the Academicly Talented
| Others |
| MACATAK | MAintenance Capabilities ATtAcK Model
| Others |
| MACAUTO | Mcmaster Institute for Automotive Research and Technology
| Others |
| MACAW | Mouse Analytics for Computer Assisted Workshops
| Others |
| MACAW | Multiple Access Collision Avoidance for Wireless
| Others |
| MACAW | Multiple Access with Collision Avoidance for Wireless
| Others |
| MACAW | Multiple Alignment Construction and Analysis Workbench
| Others |