AAV or Aav may refer to:

Businesses

• Advantage Oil & Gas Ltd., a Canadian oil and gas company
• Allah Valley Airport (IATA airport code), in Allah Valley, Mindanao, Philippines
• 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

• Anomalous Aerial Vehicle, a military term for an unidentified flying object
• Anti-aircraft vehicle, or self-propelled anti-aircraft weapon
• Assault Amphibious Vehicle or Amphibious Assault Vehicle, an amphibious tracked vehicle

People

• Aav (surname), Estonian surname
• Aníbal Acevedo Vilá, former 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