| Metadata for Architectural Contents in Europe | Academic & Science |
| Midwater Assessment Conservation Engineering | Academic & Science |
| Models And Counter Examples | Academic & Science |
| Mar Athanasius College of Engineering | Academic & Science |
| Mace Security International, Inc. | Business |
| Michael Angelo Creative Enterprises | Business |
| Middleware Architecture Committee for Education | Community |
| Master of Arts in Christian Education | Community |
| Martial Arts Combative Education | Community |
| Movement and Combat Education | Community |
| Metro Association of Classroom Educators | Community |
| Malta Arts Culture and Entertainment | Community |
| Merseyside Association for Conductive Education | Community |
| Mobile AI Compute Engine | Computing |
| Multicriteria Analysis for Concept Evaluation | Computing |
| Macintosh Application Compatibility Environment | Computing |
| Macintosh Audio Compression Environment | Computing |
| Modern Air Combat Environment | General |
| Middeck Active Control Experiment | General |
| Motorola Advanced Cryptographic Engine | General |
| Mid Atlantic Convention Expo | General |
| Media Archive for Central England | General |
| Malone Antergrade Continence Enema | General |
| Major Adverse Cardiovascular Event | General |
| Mira Autonomous Control Equipment | General |
| Melbourne Atari Computer Enthusiasts | General |
| Metro Area Crime Elimination | Governmental |
| Mechanized Armored Combat Exosuit | Governmental |
| Massive Air Combat Event | Governmental |
| Mechanical Antenna Control Electronics | Governmental |
| Military Acute Concussion Evaluation | Medical |
| Major Adverse Cardiac Events | Medical |
| Major Adverse Cardiovascular Events | Medical |
| Martial Arts Cultural Exchange | Sports |
