| MACI | Massachusetts Association for the Chemically Injured 
| Others |
| MACI | Master of Arts in Curriculum and Instruction
| Others |
| MACI | Matrix Associated Chondrocyte Implantation
| Others |
| MACI | Matrix-Induced Chondrocyte Implantation
| Others |
| MACI | Michigan Automotive Compressor Inc
| Others |
| MACI | Michigan Automotive Compressor Inc.
| Others |
| MACI | Michigan Automotive Compressor, Inc.
| Others |
| MACI | Military Adaptation of Commercial Items
| Others |
| MACI | Millon Adolescent Clinical Inventory
| Others |
| MACI | Model Aeronautics Council of Ireland
| Others |
| MACI | Monitor, Access, and Control Interface
| Others |
| MACI | Montana Alliance for Citizen Information
| Others |
| MACI | Multi Account Copier for Investors
| Others |
| MACI | Multimedia Advanced Computational Infrastructure
| Others |
| MACI | Multiple Access Cryptographic Interface
| Others |
| MACID | Medium Access Control IDentifier
| Others |
| MACID | Midwest Association for Commercial and Industrial Development
| Others |
| MACINTOSH | More Accurate Computer Inter-Networking, at the Top Of Such Heights
| Others |
| MACINTOSH | Most Applications Crash If Not The Operating System Hangs
| Others |
| MACINTOSH | Most Applications Crash, If Not Then Operating System Hangs
| Others |
| MACINTOSH | Most Applications Crash, If Not, The Operating System Hangs
| Others |
| MACIO | Macintosh Input Output
| Others |
| MACIS | Metastases, Age, Completeness of resection, Invasion, Size
| Others |
| MACIT | Medical Assistance Crisis Intervention Team
| Others |
| MACIT | Multi Agency Crisis Intervention Team
| Others |
| MACJ | Master of Arts in Criminal Justice
| Others |
| MACJC | Mississippi Association of Community & Junior Colleges
| Others |
| MACK | Massive Amount of Creative Knowledge
| Others |
| MACK | Master Acknowledge
| Others |
| MACK | Membina Api Cinta Kasih
| Others |
| MACK | Mid Atlantic Cichlid Keepers
| Others |
| MACK | Mobile Attack Climbing Kit
| Others |
| MACK | Mountain Area Corvair Klub
| Others |
| MACKLE | Matthew Alex Caitlin Kayla Luca Evin
| Others |
| MACL | Maldives Airports Company Limited
| Others |
| MACL | Master of Advanced Corporation Law
| Others |
| MACL | Master of Arts Community Leadership
| Others |
| MACL | Master of Arts in Christian Leadership
| Others |
| MACL | Masters of Arts in Christian Leadership
| Others |
| MACL | Mid America Clinical Laboratories
| Others |
| MACL | Mid America Clinical Labs
| Others |
| MACL | Mid Atlantic Collegiate League
| Others |
| MACL | Milwaukee Academy of Chinese Language
| Others |
| MACL | Mission Association for Community Living
| Others |
| MACL | Modal Analysis and Controls Laboratory
| Others |
| MACM | Malta Association of Credit Management
| Others |
| MACM | Master of Arts in Christian Ministry
| Others |
| MACM | Master-at-arms Master Chief Petty Officer
| Others |
| MACM | Medical Assurance Company of Mississippi
| Others |
| MACM | Michigan Association of Court Mediators
| Others |