| Abbreviation | Definition |
|---|---|
| MMFC | Maureen McCormick Fan Club |
| MMGC | McDowell Mountain Golf Club |
| MMGC | Melton Mowbray Golf Club |
| MMHC | Michigan Mushroom Hunters Club |
| MMHC | Million Mile High Club |
| MMMC | Maytag Messerschmitt Motorcycle Club |
| MMRC | Mini Mermaid Running Club |
| MMSC | Mt Mansfield Ski Club |
| MMSC | Mundelein Mustang Swim Club |
| MMTC | Mid Maryland Triathlon Club |
| MMTC | Mid Michigan Track Club |
| MNSC | Melbourne Nordic Ski Club |
| MOAC | Montreal Outdoor Adventure Club |
| MOBC | Michigan Ohio Briard Club |
| MOBC | Midge Owners and Builders Club |
| MOC | Montclair Operetta Club |
| MOCI | M Owners Club Indonesia |
| MOCK | Mitsubishi Owners Club of Kenya |
| MOGC | Mount Osmond Golf Club |
| MOGC | My Online Golf Club |