| Acronym | Definition |
|---|
| AAO➣American Academy of Ophthalmology |
| AAO➣American Academy of Otolaryngology (Head & Neck Surgery) |
| AAO➣American Association of Orthodontists |
| AAO➣Alpha and Omega |
| AAO➣Against All Odds |
| AAO➣Against All Odds (gaming clan) |
| AAO➣Age At Onset |
| AAO➣American Academy of Optometry |
| AAO➣All As One (various locations) |
| AAO➣Alert and Oriented |
| AAO➣Anglo-Australian Observatory |
| AAO➣America's Army: Operations (game) |
| AAO➣Alumni Affairs Office (various schools) |
| AAO➣American Academy of Osteopathy |
| AAO➣All at Once |
| AAO➣Academic Affairs Office (various schools) |
| AAO➣Affirmative Action Officer (various locations) |
| AAO➣Archives Association of Ontario |
| AAO➣America's Army Operations (game) |
| AAO➣Australian Army Orders |
| AAO➣Amino Acid Oxidase |
| AAO➣am angegebenen Ort |
| AAO➣Am Angegebenen Ort (German) |
| AAO➣Approved Acquisition Objective |
| AAO➣Anodic Alumina Oxide |
| AAO➣Association of Aviation Ordnancemen |
| AAO➣Army Acquisition Objective |
| AAO➣Authorized Acquisition Objective |
| AAO➣Administrative Appeal Office (U.S. Citizenship and Immigration Services) |
| AAO➣Association des Amis des Oiseaux (French) |
| AAO➣Awake, Alert and Oriented (medical) |
| AAO➣Association des Archives de l'Ontario (French: Archives Association of Ontario) |
| AAO➣Acetaldehyde Oxime |
| AAO➣Airborne Area of Operation |
| AAO➣Audio, Acoustique et Ondes (French: Audio, Acoustics and Waves) |
| AAO➣Area Audit Office |
| AAO➣Adverse Assumption Obstacle |
| AAO➣Autonomous Aircraft Operations |
| AAO➣American's Army: Operations (game) |
| AAO➣Army Acquisition Organization |