| Abbreviation | Definition |
|---|---|
| MNC | Mythical National College football |
| MNF | Margarita Night Football |
| MNF | Monday Night Football |
| MNLF | Monday Night Lads Football |
| MNTF | Monday Night Touch Football |
| MPFA | Madhya Pradesh Football Association |
| MPFC | Middle Park Football Club |
| MRFU | Malta Rugby Football Union |
| MRFU | Marlborough Rugby Football Union |
| MRFU | Midwest Rugby Football Union |
| MRFU | Missouri Rugby Football Union |
| MRFU | Mongolian Rugby Football Union |
| MSFA | Mid-States Football Association |
| MSFL | Maccabi Southern Football League |
| MSFL | Mid Sussex Football League |
| MSFL | Middle School Football League |
| MSFL | Moravian–Silesian Football League |
| MSYF | Mahomet Seymour Youth Football |
| MTFC | Macclesfield Town Football Club |
| MTFC | Mansfield Town Football Club |