| Abbreviation | Definition |
|---|---|
| MLC | Midwest Lancer Club |
| MLOC | Midlands Lotus Owners Club |
| MLOC | Mitsubishi Lancer Owner Club |
| MLRC | Mountain Lakes Rowing Club |
| MMAC | McHenry Marlins Aquatic Club |
| MMAC | Montreal Mynix Athletic Club |
| MMBC | Manawatu Marine Boating Club |
| MMBC | Minnesota Mixed Breed Club |
| MMBC | Miri Mountain Bike Club |
| MMC | Mickey Mouse Club |
| MMC | Monticello Motor Club |
| MMC | The Micky Mouse Club |
| MMCH | Mickey Mouse Clubhouse |
| MMCH | Minnesota Men's Club |
| MMCH | Minnesota Men's Club Hockey |
| MMCI | Masonic Motorcycle Club International |
| MMCI | Mens Motorcycling Club Of Indiana |
| MMCL | Military Modelers Club Louisville |
| MMCL | Military Modelers Club of Louisville |
| MMCN | Morris Minor Club Nederland |