| MACS | Molecular And Cellular Sciences 
| Others |
| MACS | Monitor And Control System
| Others |
| MACS | Morning Alcohol Confusion Syndrome
| Others |
| MACS | Motorola Advanced Computer System
| Others |
| MACS | Multi Aids Cohort Study
| Others |
| MACS | Multi Axis Crystal
| Others |
| MACS | Multi Axis Crystal Spectrometer
| Others |
| MACS | Multi-Access Communication Server
| Others |
| MACS | Multicenter Aids Cohort Study
| Others |
| MACS | Multimedia Archive and Communication System
| Others |
| MACS (CBER) | Manufacturers Assistance and Communications Staff (CBER)
| Others |
| MACSA | Mexican American Community Services Agency
| Others |
| MACSAT | Macquarie Satellite Radio
| Others |
| MACSAT | Multiple Access Commercial Satellite
| Others |
| MACSTAC | Macintosh Southern Tier Apple Club
| Others |
| MACSTAR | Multiple Access Customer Station Rearrangement
| Others |
| MACSYMA | Mac's Symbolic Manipulation System
| Others |
| MACT | Master of Arts in Communication and Technology
| Others |
| MACT | Maulana Azad College of Technology
| Others |
| MACT | Maximum Achievable Control Technology
| Others |
| MACT | Media Art Culture and Technology
| Others |
| MACT | Men Of All Colors Together
| Others |
| MACT | Microsoft Application Center Test
| Others |
| MACT | Minnesota Association of Community Theatres
| Others |
| MACT | Mitsubishi Advanced Combustion Technology
| Others |
| MACT | Mobile App Conversion Tracking
| Others |
| MACT | Motor Accident Claims Tribunal
| Others |
| MACT | Multiple Automatic Cryogenic Trapping
| Others |
| MACT | Musical Attention Control Training
| Others |
| MACTA | Malayalam Cine Technicians Association
| Others |
| MACTA | Mid-America Combined Training Association
| Others |
| MACTA | Minnesota Association of Community Telecommunications Administrators
| Others |
| MACTB | Malaysian Association of Cell and Tissue Banking
| Others |
| MACTB | Musfirah Anna Cinderella Tinker Bell
| Others |
| MACTE | MAine's Career and Technical Education
| Others |
| MACTE | Minnesota Association of Colleges for Teacher Education
| Others |
| MACTE | Montessori Accreditation Council for Teacher Education
| Others |
| MACTIS | Marine and Coastal Technology Information Service
| Others |
| MACTUG | Mac Technical Users Group
| Others |
| MACU | Machine adapted clamping units
| Others |
| MACU | Marketing Association for Credit Unions
| Others |
| MACU | Massillon Area Credit Union
| Others |
| MACU | Max Curth
| Others |
| MACU | Medical Acute Care Unit
| Others |
| MACU | Members Advantage Credit Union
| Others |
| MACU | Mid America Christian University
| Others |
| MACU | Mid Atlantic Christian University
| Others |
| MACU | Mountain America Credit Union
| Others |
| MACU | Movimiento Anticomunista Catolico Unido
| Others |
| MACU | Multidrop Auto Call Unit
| Others |