| Abbreviation | Definition |
|---|---|
| MAYLA | Minneapolis Area Youth Lacrosse Association |
| MAYO | Mexican American Youth Organization |
| MAYS | Metropolitan Area Youth Symphony |
| MCYM | Military Community Youth Ministry |
| MCYO | Maryland Classic Youth Orchestras |
| MCYS | Manchester Centre for Youth Studies |
| MCYS | Montgomery County Youth Services |
| MELN | Mukamana Enock Lea NIYONSABA |
| MERCY | Maximizing Effort for Relief Care and Youth |
| MERCY | Maximizing Efforts for Relief Care and Youth |
| MERCY | Mount Evelyn Reformed Church Youth |
| MERY | Ministry of Education Research and Youth |
| MEY | Ministry of Education and Youth |
| MFBTY | My Fan's Better Than Yours/rap |
| MGYG | Muslim Girls Youth Group |
| MHY | Mars Home for Youth |
| MISTY | Mentors In Service To Youth |
| MITY | Minnesota Institute for Talented Youth |
| MIYO | Marin Interfaith Youth Outreach |
| MIYP | Malaysia International Youth Programme |