| Abbreviation | Definition |
|---|---|
| MVSC | Mid-Valley Soccer Club |
| MYSA | Missouri Youth Soccer Association |
| MYSL | Michigan Youth Soccer League |
| MYSL | Middlebury Youth Soccer League |
| MYSL | Middlesex Youth Soccer League |
| MYSL | Midlothian Youth Soccer League |
| MYSL | Mission Youth Soccer League |
| MYSL | Murrieta Youth Soccer League |
| NABS | National Association of Bubble Soccer |
| NASL | North Accomack Soccer League |
| NASL | North American Soccer League |
| NBSC | New Berlin Soccer Club |
| NCSA | Northern Counties Soccer Association |
| NCSC | Nepean City Soccer Club |
| NCSL | National Capital Soccer League |
| NCSP | North County Soccer Park |
| NDSA | North Dakota Soccer Association |
| NFSC | Niagara Falls Soccer Club |
| NHSA | New Hampshire Soccer Association |
| NIL | Zero |