| Abbreviation | Definition |
|---|---|
| MERP | Middle Earth Role Play |
| MESP | Michael Epstein Sports Productions |
| METS | New York Metropolitans |
| MEW | Middle Earth Wrestling |
| MEWA | Michigan Elite Wrestling Academy |
| MEWF | Mid Eastern Wrestling Federation |
| MF | Main Football |
| MF | Men's Foil ( Fencing) |
| MFA | Midwest Footbag Association |
| MFF | Metroplex Flag Football |
| MFFL | Metroplex Flag Football League |
| MFHA | Masters of FoxHounds Association |
| MFL | Madden Football League |
| MFL | Mail-in Fishing License |
| MFL | Maui Football Links |
| MFL | Mcadoo Football League |
| MFL | Metroplex Flag Football League |
| MFO | Men's Foil Open (Fencing) |
| MFPI | Mountaineering Federation of the Philippines, Incorporated |
| MFU | Men's Foil Unclassified (Fencing) |