| Acronym | Definition |
|---|
| OMAA➣Oh My Aching Ass |
| OMAA➣Osztrák Magyar Akció Alapítvány (Hungarian: Austro-Hungarian Foundation for Action; Budapest, Hungary) |
| OMAA➣Ontario Metis Aboriginal Association (Ontario, Canada) |
| OMAA➣Ontario Municipal Administrators' Association (Toronto, Ontario, Canada) |
| OMAA➣Office for Multicultural and Academic Affairs (University of Minnesota) |
| OMAA➣Okinawan Martial Arts Association (UK) |
| OMAA➣Ossett Martial Arts Academy (UK) |