| MACM | Minnesota Association for Court Management 
| Others |
| MACM | Missile Application Condensed Message
| Others |
| MACM | Multi Account Copier for Managers
| Others |
| MACM | Municipal Authority of the City of McKeesport
| Others |
| MACM | Music Auditorium College of Music
| Others |
| MACMA | Michigan Agricultural Cooperative Marketing Association
| Others |
| MACMA | Michigan Agricultural Cooperative Marking Association
| Others |
| MACMA | Mid Atlantic Club Management Association
| Others |
| MACMA | Mid-Atlantic Circulation Managers Association
| Others |
| MACMA | Mid-Atlantic Club Management Association
| Others |
| MACMA | Ministerial Advisory Council on Multicultural Affairs
| Others |
| MACMIS | Marketing, Advertising and Communication Management Information System
| Others |
| MACMT | Microsoft Advanced Character Mapping Tool
| Others |
| MACN | Madison Area Chefs Network
| Others |
| MACN | Maritime Anti Corruption Network
| Others |
| MACN | Massachusetts Association of Colleges of Nursing
| Others |
| MACN | Minnesota Association of Colleges of Nursing
| Others |
| MACN | Missouri Association of Crisis Negotiators
| Others |
| MACN | Museo Argentino de Ciencias Naturales
| Others |
| MACNA | Marine Aquarium Conference North America
| Others |
| MACNA | Marine Aquarium Conference of North America
| Others |
| MACNJ | Macintosh Association of Central New Jersey
| Others |
| MACO | Major Assembly CheckOut
| Others |
| MACO | Management And Community Organization
| Others |
| MACO | Marginal Contribution
| Others |
| MACO | Marketing And Commerce Online
| Others |
| MACO | Mars Atmospheric Constellation Observatory
| Others |
| MACO | Marshalling Area Control Officer
| Others |
| MACO | Master of Arts in Christian Outreach
| Others |
| MACO | Maximum Accouterments Carry-On
| Others |
| MACO | Maximum Allowable Carryover
| Others |
| MACO | Measure Analyse Clean Observe
| Others |
| MACO | Military Assault Command Operations
| Others |
| MACO | Military Assault Command Operative
| Others |
| MACO | Military Assistance Counter Offensive
| Others |
| MACO | Minnesota Association of County Officers
| Others |
| MACO | Mobile Authentication Convenience Options
| Others |
| MACO | Modular Aircraft for Conceptual Operations
| Others |
| MACO | Multicultural Affairs and Community Outreach
| Others |
| MACO | Multiple Agent Climbing Organism
| Others |
| MACO | The Make A Change Organisation
| Others |
| MACO | The Make A Change Organization
| Others |
| MACOE | Centro de Operaciones de Emergencia de America Central
| Others |
| MACOE | Multi-Agent Common Operating Environment
| Others |
| MACOM | Major Army Command
| Others |
| MACOM | Major Command (Army)
| Others |
| MACONET | Management Consulting Network
| Others |
| MACOS | Macintosh Operating System
| Others |
| MaCoSa | Matematica per Conoscere e per Sapere
| Others |
| MACOSA | MAterial y COnstrucciones, S. A.
| Others |