| Abbreviation | Definition |
|---|---|
| MNAO | Mennonite Nurses Alumni Organization |
| MNIS | Member of the Nigerian Institution of Surveyors |
| MO | Main Organizer |
| MOB | Maatschappelijk Overleg Betalingsverkeer (National Forum on the Payment System) |
| MOB | Members Of Barleyment |
| MOBA | Metro Omaha Builders Association |
| MOC | Maintenance Of Certification |
| MOCA | Multimedia Over Co-ax Alliance |
| MOM | Middleton Outreach Ministry |
| MOPA | Misamis Oriental Pharmaceutical Association |
| MOSA | Midwest Organic Services Association |
| MOSA | Mmonmouth Ocean Soccer Association |
| MOSA | Monmouth Ocean Soccer Association |
| MOSG | Michigan Open Source Group |
| MPA | Massachusetts Pharmacy Association |
| MPAA | Motion Picture Association of America |
| MPBA | Malaysian Professional And Business Association |
| MPCOA | Mail And Parcel Center Owners Association |
| MPGA | Maine Professional Guides Association |
| MPGA | Michigan Propane Gas Association |