| Acronym | Definition |
|---|
| MACS➣Macintosh System (creator code on system files) |
| MACS➣Make A Child Smile (Sunrise, FL; charity organization) |
| MACS➣Minimal Access Cranial Suspension (facelift) |
| MACS➣Master of Arts in Communication Studies (various schools) |
| MACS➣Macros |
| MACS➣Microsoft Audit Collection Services |
| MACS➣Malaysian Association of Company Secretaries (est. 1989) |
| MACS➣Mobile Air Conditioning Society |
| MACS➣Magnetic-Activated Cell Separation |
| MACS➣Mathematics and Computer Science |
| MACS➣Mathematical and Computer Sciences |
| MACS➣Marine Air Control Squadron |
| MACS➣Modular Artillery Charge System (US Army) |
| MACS➣Maryland Association of Community Services |
| MACS➣Multi Agency Coordination System |
| MACS➣Minnesota Association of Charter Schools |
| MACS➣Mobile Approach Control System |
| MACS➣Master of Arts in Christian Studies |
| MACS➣Magnetic Active Compensation System |
| MACS➣Multipurpose Arcade Combat Simulator |
| MACS➣Modem Access Control System |
| MACS➣Microsoft Audit Collection System |
| MACS➣Massive Cluster Survey |
| MACS➣Money Advice and Community Support Service (Brighton, East Sussex, UK) |
| MACS➣Manufacturing Application Control System |
| MACS➣Maximum Adjacent Cut Specification (locksmithing) |
| MACS➣Michigan Association of Convenience Stores |
| MACS➣Senior Chief Master-at-Arms (US Navy) |
| MACS➣Medium Access Control Sublayer |
| MACS➣Member of Australian Computer Society |
| MACS➣Mutually Agreeable Commercial Software |
| MACS➣Multiple Access Communications System |
| MACS➣Mail Order and Catalog System |
| MACS➣Mac Asheville Computer Society |
| MACS➣Mapping Application Client/Server |
| MACS➣Mansfield Adult CoEd Soccer (Texas) |
| MACS➣Mid-America Cable Show |
| MACS➣Mid-Atlantic Cooperative Services LLC (electric power company) |
| MACS➣Manitoba Academy of Chinese Studies |
| MACS➣Multilink Access Control Systems (UK) |
| MACS➣Major Apparatus and Cable System |
| MACS➣Manned Air Combat Simulator |
| MACS➣Manipulation and Beam Collimation System |
| MACS➣Modified Atomic Charge Superposition |
| MACS➣Middle Atmosphere in the Climate System |
| MACS➣Modular Digital Altitude Control System |
| MACS➣Mobile Ash Conditioning System |
| MACS➣Multiline Automatic Calling System |
| MACS➣Mobile Armored Crew Station |
| MACS➣Master Alert Control Station |
| MACS➣Senior Chief Machine Accountant (US Navy rating) |
| MACS➣Medicare Automated Claims System |