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MACSMacintosh System (creator code on system files)
MACSMobile Air Conditioning Society
MACSMathematics and Computer Science
MACSMathematical and Computer Sciences
MACSMarine Air Control Squadron
MACSModular Artillery Charge System (US Army)
MACSMaryland Association of Community Services
MACSMulti Agency Coordination System
MACSMinnesota Association of Charter Schools
MACSMobile Approach Control System
MACSMaster of Arts in Christian Studies
MACSMagnetic Active Compensation System
MACSMultipurpose Arcade Combat Simulator
MACSModem Access Control System
MACSMicrosoft Audit Collection System
MACSMassive Cluster Survey
MACSMoney Advice and Community Support Service (Brighton, East Sussex, UK)
MACSManufacturing Application Control System
MACSMaximum Adjacent Cut Specification (locksmithing)
MACSSenior Chief Master-at-Arms (US Navy)
MACSMichigan Association of Convenience Stores
MACSMedium Access Control Sublayer
MACSMember of Australian Computer Society
MACSMutually Agreeable Commercial Software
MACSMultiple Access Communications System
MACSMail Order and Catalog System
MACSMac Asheville Computer Society
MACSMapping Application Client/Server
MACSMid-Atlantic Cooperative Services LLC (electric power company)
MACSMid-America Cable Show
MACSMultilink Access Control Systems (UK)
MACSManitoba Academy of Chinese Studies
MACSMajor Apparatus and Cable System
MACSManipulation and Beam Collimation System
MACSModified Atomic Charge Superposition
MACSManned Air Combat Simulator
MACSMiddle Atmosphere in the Climate System
MACSMultiline Automatic Calling System
MACSModular Digital Altitude Control System
MACSMobile Ash Conditioning System
MACSMobile Armored Crew Station
MACSMaster Alert Control Station
MACSSenior Chief Machine Accountant (US Navy rating)
MACSMedicare Automated Claims System
MACSMagnetic-Activated Cell Separation
MACSMake A Child Smile (Sunrise, FL; charity organization)
MACSMansfield Adult CoEd Soccer (Texas)
MACSMaster of Arts in Communication Studies (various schools)