Aoa, AOA, or AoA may refer to:

• Agreement on Agriculture, a World Trade Organization treaty
• Administration on Aging, a health agency of the United States
• Angolan kwanza, the currency of Angola
• Auxiliary Organizations Association, an organized body related to the California State University system
• Analysis of Alternatives, form of trade study used by the Department of Defense

• Aoa affinis, a species of butterflies in the family Pieridae
• Age of acquisition, a psycholinguistic term
• Alpha Omega Alpha, a medical honor society
• American Optometric Association, a health association
• American Osteopathic Association, a medical association
• Ammonia-oxidizing archaea performing oxidation of ammonia into nitrite (Nitrification)
• Angle of arrival, direction from which a radio wave arrives at an antenna array
• Angle of attack, a measure of a body through a fluid
• Australian Orthopaedic Association, a not-for-profit organisation

• Analysis of Alternatives, a method of analyzing choices
• Articles of association, a document that establishes the basic details of a corporation
• Activity on arrow, the activities on the arrows of the arrow diagramming method in project planning

• Air operations area, the area of an airport used for landing, takeoff, or surface maneuvering of aircraft
• Airport Operators Association, a trade association for UK airport operators
• American Overseas Airlines, a former transport company
• Angle of attack, the angle between the chord line of the wing of a fixed-wing aircraft and the vector representing the relative motion between the aircraft and the atmosphere
• Abort once around, a type of Space Shuttle abort mode

• AOA (group), a South Korean girl group debuted in 2012
• Act of Aggression, video game
• Age of Apocalypse, a comic storyline
• Aniplex of America, an anime licensor
• Armies of Arcana, a tabletop war game
• The Axis of Awesome, an Australian comedy band

• ʻAoa, a village in American Samoa
• Adam-Ondi-Ahman, a sacred location for the Latter Day Saints
• American Outlaws Association, a motorcycle club
• Andrews Osborne Academy, a school
• As-salamu alaykum, traditional meeting between Muslims, coined in late 90's by M. Shomail Haider

• Automated online assistant, a program that attempts to assist users