AOA is the abbreviation for:
- Abort Once Around, a Space Shuttle abort mode during ascent
- Agreement on Agriculture, an international agricultural trade agreements
- Angle of Arrival - A method for the localization of mobile devices in mobile networks.
- Angle of Attack (English for angle of attack) - angle between the incoming air and a wing
- Airborne Optical Adjunt - Airborne Optical auxiliary system, a US- infrared telescope as an auxiliary defense system missile defense
- Kwanza, the official currency of Angola (ISO 4217 code)
- American Outlaws Association Organization of the Outlaws MC, a motorcycle club