AAV or Aav may refer to:
Aviation
- Anomalous Aerial Vehicle, a military term for an unidentified flying object
- Anti-aircraft vehicle, or self-propelled anti-aircraft weapon
- IATA airport code for Allah Valley Airport in Soccsksargen Region, Philippines
Businesses
- Advantage Oil & Gas Ltd., a Canadian oil and gas company
- Arab American Vehicles, a car assembler in Egypt
- Armstrong Studios, an Australian recording studio later renamed AAV
Language
- African American Vernacular English
- Austroasiatic languages, a language group of Southeast Asia
Military
- Assault Amphibious Vehicle or Amphibious Assault Vehicle, an amphibious tracked vehicle
People
- Aav (surname), Estonian surname
- Aníbal Acevedo Vilá, governor of Puerto Rico (2005-2008)
Other uses
- Adeno-associated virus, a nonpathogenic virus used as a gene therapy tool
- Air admittance valve, a valve in a drain-waste-vent system
- Aire d'attraction d'une ville, a metropolitan statistical area used by the French national statistics office INSEE
- Another Angry Voice, a British political blog
- Vatican Apostolic Archive, Latin: Archivum Apostolicum Vaticanum
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