| Acronym | Definition |
|---|
| OAA | Older Americans Act |
| OAA | Ontario Association of Architects |
| OAA | Old Age Assistance |
| OAA | Oxaloacetate |
| OAA | Office of Academic Affiliations (Department of Veterans Affairs) |
| OAA | Outstanding Achievement Award |
| OAA | Open Agent Architecture |
| OAA | Obstetric Anaesthetists' Association |
| OAA | Office of the Administrative Assistant (US Army) |
| OAA | Organic Acidemia Association (Plymouth, MN) |
| OAA | Ontario Accommodation Association (Canada) |
| OAA | Organization of Africans in the Americas |
| OAA | Out and About |
| OAA | Other Adjustments Account (US Federal Tax Form 1120s) |
| OAA | Offender Accountability Act (State of Washington, USA) |
| OAA | Orbiter Access Arm (US NASA) |
| OAA | Oakland Activities Association (Michigan) |
| OAA | On Air Activation |
| OAA | Ohio Aquaculture Association |
| OAA | Over Air Addressing |
| OAA | Online Access Agreement (disclaimer document) |
| OAA | Oklahoma Aquaculture Association |
| OAA | Operational Assessment Analysis |
| OAA | Optician's Association of America |
| OAA | Open Access Architecture (West Wave) |
| OAA | Over the Air Activation Signal |
| OAA | Operations, Activities and Actions |
| OAA | Order of American Ambassadors |
| OAA | Owner Agency Agreement (commercial real estate) |
| OAA | Office of Academic Assessment (various schools) |
| OAA | Office for Academic Affairs (various schools) |
| OAA | Open Access Archive |