OMAA
| 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) |