| Abbreviation | Definition |
|---|---|
| MABL | Mountain Area Ball League |
| MAC | Marshall Always Champion |
| MAC | Marshall And Challengers |
| MAC | Marshall Athletic Conference |
| MAC | Mid America Conference |
| MAC | Mid-American Conference |
| MAC | Missoula Aquatic Club |
| MAC | Multnomah Athletic Club |
| MACC | Michigan Alpine Competition Committee |
| MACC | Mid-America Conference of Clubs |
| MACC | Mid-Atlantic Cricket Conference |
| MACH | Military Air Command Hunter |
| MACI | Mandel Atletiek Club Izegem |
| MACS | Martial Arts Collective Society |
| MACS | Mid-Atlantic Championship Series |
| MAD | Mechanical Amusement Device |
| MAFF | Martial Arts Family Fitness |
| MAFIA | Mid America Fists In Action |
| MAFIA | Morte Alla Francia Italia Annella |
| MAGA | Metropolitan Amateur Golf Association |