Avo or AVO may refer to:

• ÁVO, Hungarian secret police (1950–1956)
• Avo Photonics, optical electronics firm
• AVO Cigars, tobacco company founded by Avo Uvezian

• Avo (name), masculine given name found in Estonia

• Alaska Volcano Observatory, a hazard monitoring program
• Amplitude versus offset, a concept used in reflection seismology
• Astrophysical Virtual Observatory, a European research project
• Avometer, a brand of multimeter that measures amps–volts–ohms

• Agent–verb–object, a sentence structure in linguistics
• Apprehended Violence Order, an injunction in Australia
• Avon Park Executive Airport (IATA code), in Florida, U.S.
• 1⁄100 of a Macanese pataca
• 1⁄100 of a Portuguese Timorese pataca
• "AVO", a song on Amor Vincit Omnia by Pure Reason Revolution
• Avo, a character from Fable
• Avo, nom-de-guerre of Armenian-American revolutionary Monte Melkonian (1957–1993)

• Avos (disambiguation)