| Acronym | Definition |
|---|
| OAO➣Office of Advocacy and Outreach (USDA) |
| OAO➣Office of Administrative Operations (US DOC) |
| OAO➣Owned and Operated |
| OAO➣Orbiting Astronomical Observatory |
| OAO➣Over and Out |
| OAO➣One And Only |
| OAO➣Overall Opinion (marketing) |
| OAO➣Ontario Association of Orthodontists |
| OAO➣Ontario Association of Optometrists |
| OAO➣Opticians Association of Ohio |
| OAO➣Oregon Academy of Ophthalmology |
| OAO➣Orthogonalized Atomic Orbital |
| OAO➣Office of Appellate Operations (US Social Security Administration) |
| OAO➣Otkrytoe Aktsionernoe Obschestvo (Russian: Open Joint Stock Corporation) |
| OAO➣Orbital Analysis Officer |
| OAO➣One Among Others |
| OAO➣Other Authorised Operator (telecommunications) |
| OAO➣Objective Area Officer |