• Av, a month in the Hebrew calendar
• Av is a common abbreviation for aperture priority on a camera mode dial.

aV may mean:

• attovolt, an SI unit of electromotive force

av may mean:

• Avar language; ISO 639-1 code for this language

AV may mean:

• Access violation in software
• Adult video, see Pornography or Pornographic film
• AltaVista, a search engine
• Alterac Valley, a player versus player instance dungeon in the MMORPG World of Warcraft
• The Alternative Vote, another name for instant-runoff voting
• America Votes
• Angela Via, a singer
• Anguilla (FIPS 10-4 code and obsolete NATO digram)
• Annular velocity, in Fluid dynamics
• Antelope Valley, a desert region of northern Los Angeles County, California, in the US
• Anti-virus, see Anti-virus software
• Apparent viscosity, in Fluid dynamics
• Approval voting
• Arcade Volleyball, an MS-DOS video game
• Artificial vagina, a sex-toy
• Assessed value
• atrioventricular or arteriovenousin medicine, either
• Audio-visual, see also Video
• Authorised Version or King James Version of the Bible
• Avatar (computing), an icon representing an Internet use
• Avaya, a company listed on the New York Stock Exchange with symbol "AV"
• Avenue, see Road (Ave. is more frequent)
• Average
• Avianca; AV is the IATA code for this airline
• Aviation, a military acronym or shorter version
• The A.V. Club, the entertainment section of The Onion.
• Gold, in the field of numismatics (from the Latin spelling of Aurum, Avrvm)