| Acronym | Definition |
|---|
| OMCA➣Open Manage Client Administrator |
| OMCA➣Ontario Motor Coach Association |
| OMCA➣Ontario Mathematics Coordinators Association (Canada) |
| OMCA➣Omron Management Center of America, Inc. (Schaumburg, IL) |
| OMCA➣Oxford Monographs on Classical Archaeology (publication; Oxford University Press; UK) |
| OMCA➣Office for Multicultural Affairs (Germany) |
| OMCA➣Oregon Medical Cannabis Award (Portland, OR) |