| Acronym | Definition |
|---|
| OMSA | Open Manage Server Administrator |
| OMSA | OpenManage Server Administrator (Dell computer utility) |
| OMSA | Offshore Marine Service Association |
| OMSA | Orders and Medals Society of America |
| OMSA | Ontario Medical Secretaries Association |
| OMSA | Orissa Medical Services Association (India) |
| OMSA | Oficina Metropolitana de Servicio de Autobuses (Dominican Republic) |
| OMSA | Ogden Museum of Southern Art |
| OMSA | Ontario Medical Student Association |
| OMSA | Seaman Apprentice, Opticalman Striker (Naval Rating) |
| OMSA | Office Management Student Association (Malaysia) |
| OMSA | Oral and Maxillofacial Surgery Assistant |