| MACS | Macaroni and Cheese Shop 
| Others |
| MACS | Macros
| Others |
| MACS | Magnetic Activated Cell Sorting
| Others |
| MACS | Magnetic Cell Separation
| Others |
| MACS | Manual Ability Classification System
| Others |
| MACS | Manufacturers Assistance and Communications Staff
| Others |
| MACS | Manufacturing Automation and Control Systems
| Others |
| MACS | Maroondah Approach to Clinical Services
| Others |
| MACS | Martial Arts Collective Society
| Others |
| MACS | Maryland Association of Community Services
| Others |
| MACS | Master Active Control Station
| Others |
| MACS | Master-at-arms Senior Chief Petty Officer
| Others |
| MACS | Maximum Adjacent Cut Specification
| Others |
| MACS | Mecklenburg Area Catholic Schools
| Others |
| MACS | Member of the American Chemical Society
| Others |
| MACS | Michigan Amateur Communications System
| Others |
| MACS | Micro and Anophthalmic Children's Society
| Others |
| MACS | Microsoft Audit Collection Services
| Others |
| MACS | Mid Atlantic Championship Series
| Others |
| MACS | Mid-Atlantic Championship Series
| Others |
| MACS | Migration Analysis Cleansing Service
| Others |
| MACS | Military Air Command Series
| Others |
| MACS | Minimal Access Cancer Surgery
| Others |
| MACS | Minimal Access Cranial Suspension
| Others |
| MACS | Minimal Access Cranian Suspension
| Others |
| MACS | Minnesota Association of Christian Schools
| Others |
| MACS | Mississippi Affordable College Savings
| Others |
| MACS | Mobile Air Conditioning Society
| Others |
| MACS | Mobile Armored Crew Station
| Others |
| MACS | Mobility and Access Committee for Scotland
| Others |
| MACS | Modem Access Control System
| Others |
| MACS | Modifiable And Combinable Securities
| Others |
| MACS | Modular Approach to Cloud Security
| Others |
| MACS | Modular Artillery Charge System
| Others |
| MACS | Modular Artillery Charge System (artillery)
| Others |
| MACS | Modular Attitude Control System
| Others |
| 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 |