| Abbreviation | Definition |
|---|---|
| MBYC | Mission Bay Yacht Club |
| MBYC | Morehead Beaufort Yacht Club |
| MBYC | Morro Bay Yacht Club |
| MC | Mens Club |
| MC | Mens' Club |
| MCA | Motor Club Of |
| MCA | Motor Club of America |
| MCA | Mustang Club of America |
| MCAC | Middlesex County Automobile Club |
| MCBC | Mansfield College Boat Club |
| MCBC | McHenry County Bicycle Club |
| MCBC | Merrickville Custom Bike Club |
| MCBC | Michigan Chinese Business Club |
| MCCI | Maverick Comet Club International |
| MCCI | Maverick/Comet Club International |
| MCCU | Marylebone Cricket Club Universities |
| MCDC | Movsa Career Development Club |
| MCDF | Mehari Club de France (French: Mehari Club of France; car club) |
| McDOC | Melbourn County Division Oil Club |
| MCEB | Mouloudia Club El Bayadh |