| MACUG | Member Administered Closed User Group 
| Others |
| MACUL | Michigan Association for Computer Users in Learning
| Others |
| MACUSA | The Magical Congress of the United States of America
| Others |
| MACV | Massive Aerial Combat Vehicle
| Others |
| MACV | Medical Associates of Central Virginia
| Others |
| MACV | Mid Atlantic Computer Vision
| Others |
| MACV | Military Assistance Command in Vietnam
| Others |
| MACV | Military Assistance Command Vietnam
| Others |
| MACV | Military Assistance Command, Vietnam
| Others |
| MACV | Mine Area Clearance Vehicle
| Others |
| MACV | Minnesota Assistance Council for Veterans
| Others |
| MACVSOG | Military Assistance Command, Vietnam - Studies and Observation Group
| Others |
| MACX | Mac Acquisitions
| Others |
| MACX | Mac Acquisitions, L. P.
| Others |
| MACY | Music Appreciation Connecticut Yankees
| Others |
| MAD | Machine-Aided Deconvolution
| Others |
| MAD | MAD Abbreviation Define
| Others |
| MAD | Madness And Dizgrace
| Others |
| MAD | Madrid, Spain
| Others |
| MAD | Madrid, Spain, Spaceflight Tracking and Data Network station
| Others |
| MAD | Madurese
| Others |
| MAD | Magnetic Agile and Deep
| Others |
| MAD | Magnetic Agile DeepB
| Others |
| MAD | Magnetic Anomaly Detector
| Others |
| MAD | Magnetic Audio Device
| Others |
| MAD | Maintenance Analysis Data
| Others |
| MAD | Maintenance, Assembly and Disassembly
| Others |
| MAD | Major Affective Disorder
| Others |
| MAD | Make A Decision
| Others |
| MAD | Make A Difference
| Others |
| MAD | Making A Difference
| Others |
| MAD | Making Art Different
| Others |
| MAD | Malevolent Agency of Destruction
| Others |
| MAD | Management Datagram
| Others |
| MAD | Managing All Documents
| Others |
| MAD | Manipulating Aeromagnetic Data
| Others |
| MAD | Maple, Ash, and Dogwood
| Others |
| MAD | Marco After Dark
| Others |
| MAD | Marketing, Advertising, and Design
| Others |
| MAD | Master Agility Dog
| Others |
| MAD | Math All Day
| Others |
| MAD | Max Air Dynamic
| Others |
| MAD | Maximum Administrative Delay
| Others |
| MAD | Maximum Adrenaline Dose
| Others |
| MAD | Maximum Altitude Design
| Others |
| MAD | Me And Dad
| Others |
| MAD | Mean Absolute Deviation
| Others |
| MAD | Measured Air Device
| Others |
| MAD | Mechanical Art Device
| Others |
| MAD | Mechanically Assisted Dog
| Others |