| Abbreviation | Definition |
|---|---|
| MYTH | Matthews Youth Test for Health |
| MYU | Mercer Youth University |
| MYU | Muslim Youth University |
| MYV | Metro Youth Volunteers |
| MYWA | Michigan Youth Workers Association |
| MYWA | Michigan Youth Wrestling Association |
| MYX | Maximum Youth Xperience |
| NANAY | National Alliance to Nurture the Aged and the Youth |
| NASTY | National Artichoke Society for Texas Youth |
| NASY | National Annenberg Survey of Youth |
| NATHAN | Naturally Adept Though High And Nosey |
| NATHAN | Niggas A**holes Thrusting Hoes And Niggas |
| NAYA | Native American Youth And |
| NAYA | Native American Youth Association |
| NAYAK | Netaji Association for Youth Awareness Kindling |
| NAYB | New American Youth Ballet |
| NAYES | Native American Youth Experience Survey |
| NAYI | Nebraska Agricultural Youth Institute |
| NAYL | National Alliance of Youth Leaders |
| NAYO | National Association of Youth Orchestras |