| Abbreviation | Definition |
|---|---|
| MYC | Muskegon Yacht Club |
| MYCC | Minnesota Youth Cross Country |
| MYH | MASCO Youth Hockey |
| MYH | Medfield Youth Hockey |
| MYLES | Sports |
| MYN | Mass Yoga Network |
| MYP | Make Your Play |
| MYS | Munford Youth Sports |
| MZ | Manic Zealots |
| MZQ | Metropolitan Zone Qualifier |
| N | National |
| NA | Non-Athlete |
| NAA | National Archery Association |
| NAADA | North American Amateur Drivers Association |
| NAAF | National Amateur Athletic Federation |
| NABA | National Adult Baseball Association |
| NABAC | North Andover Bicycle Advocacy Committee |
| NABO | North American Boxing Organization |
| NABR | North American Bavarian Racing |
| NAC | National Aerobic Championships |