| Acronym | Definition |
|---|
| OMA | Open Mobile Alliance |
| OMA | Ontario Medical Association (Canada) |
| OMA | Office for Metropolitan Architecture (Netherlands) |
| OMA | Outlook Mobile Access |
| OMA | Object Management Architecture |
| OMA | Office of Multicultural Affairs |
| OMA | Oregon Medical Association |
| OMA | OlimpĂada Matemática Argentina |
| OMA | Ontario Museum Association |
| OMA | Office of Minority Affairs |
| OMA | Ontario Mining Association (Canada) |
| OMA | Open Meetings Act |
| OMA | Orlando Museum of Art (Florida) |
| OMA | Oceanside Museum of Art (California) |
| OMA | One-Man Army (Quake 3 Arena clan) |
| OMA | Optical Modulation Amplitude (IEEE) |
| OMA | Office of Management Assessment |
| OMA | Oregon Mediation Association |
| OMA | Ocular Motor Apraxia |
| OMA | Office on Muslim Affairs |
| OMA | Office of Military Affairs (US CIA) |
| OMA | Orderly Marketing Agreement |
| OMA | Open Meta Archive |
| OMA | Operator Monitoring Assessment |
| OMA | Oklahoma Military Academy |
| OMA | Operations Management Association |
| OMA | Open Management Architecture (3Com) |
| OMA | Organizational Maintenance Activity |
| OMA | Outmusic Award (international gay music award) |
| OMA | Operations & Maintenance, Army |
| OMA | Omaha, NE, USA - Eppley Airfield (Airport Code) |
| OMA | Office of Management and Administration |
| OMA | Opto-Mechanical Assembly |
| OMA | Online Manual Archive |
| OMA | Outdoor Ministries Association (Church of the Brethren camping and outdoor education) |
| OMA | Organisation Mondiale de l'Autisme (World Autism Organisation) |
| OMA | Oh My Allah |
| OMA | Oilheat Manufacturers Association |
| OMA | Orlando Music Awards |
| OMA | Operations Management Application |
| OMA | Office of Members' Advocates (Wikipedian voluntary group; now Association of Members' Advocates, AMA) |
| OMA | Office of Military Application (US DOE) |
| OMA | Oil-Mineral Aggregate Formation |
| OMA | Object-based Mapping Automata |
| OMA | Order Of Magnitude Analysis |
| OMA | Optomechanical Assembly |
| OMA | Output Module Arbiter |
| OMA | One-Minute Average |
| OMA | Offsite Meeting Authorization (Sprint) |
| OMA | Orwin Manor Association (Winter Park, FL) |