| OOA | Oakland Opportunity Academy 
| Others |
| OOA | Object Oriented Analysis
| Others |
| OOA | Object Oriented Anonymous
| Others |
| OOA | Object-Oriented Analysis
| Others |
| OOA | Objektorientierte Analyse
| Others |
| OOA | Office O Architects
| Others |
| OOA | Office of Admissions
| Others |
| OOA | Office of Autism
| Others |
| OOA | Office Of The Americas
| Others |
| OOA | Office Of the Arts
| Others |
| OOA | Office On Aging
| Others |
| OOA | Office on Autism
| Others |
| OOA | Ohio Optometric Association
| Others |
| OOA | Ohio Osteopathic Association
| Others |
| OOA | Oklahoma Osteopathic Association
| Others |
| OOA | Olympia Orthopaedic Associates
| Others |
| OOA | Onderzoekschool Oncologie Amsterdam
| Others |
| OOA | Ontology Olympus Accelerator
| Others |
| OOA | Open Ocean Aquaculture
| Others |
| OOA | Open Operating Agreements
| Others |
| OOA | Oracle of Ages
| Others |
| OOA | Orchids and Onions Awards
| Others |
| OOA | Order Of Appearance
| Others |
| OOA | Order Of Arrest
| Others |
| OOA | Order Of Assassins
| Others |
| OOA | Order Of Assignment
| Others |
| OOA | Orientation Operations Assistant
| Others |
| OOA | Oskaloosa, Iowa USA
| Others |
| OOA | Out of Africa
| Others |
| OOA | Out Of Air
| Others |
| OOA | Out Of Area
| Others |
| OOA | Out Of Autoclave
| Others |
| OOA | Out Of the Ashes
| Others |
| OOA | Oxygenated Organic Aerosol
| Others |