AB, Ab, or ab may refer to:
In arts and media
- Abhishek Bachchan, an Indian actor
 - Alter Bridge, an American hard rock band
 - American Bandstand, a music-performance television show
 - Amitabh Bachchan, an Indian actor
 - Analecta Bollandiana, an academic journal
 - Ancienne Belgique, a Belgian concert hall located in Brussels
 - Angry Birds, a 2009 puzzle video game by Rovio Entertainment
 
In business
Business terminology
- Akcinė bendrovė, Lithuanian equivalent of an S.A. corporation
 - Aktiebolag, Swedish for "corporation", similar to AG, Ltd or Inc
 
Businesses
- A & B High Performance Firearms, a defunct sporting firearms manufacturer
 - AB Airlines, a defunct British airline
 - AB Groupe, a French broadcasting group
 - Activision Blizzard, American holding company for Activision and Blizzard Entertainment
 - Air Berlin (IATA airline code AB)
 - Alderson-Broaddus College, a liberal-arts college in West Virginia
 - Alfa-Beta Vassilopoulos, a Greek supermarket chain
 - Allen-Bradley, a brand of industrial control products, manufactured by Rockwell Automation
 - AllianceBernstein (New York Stock Exchange Symbol AB), a US-based asset management firm
 - American Biograph, AB used as a film logo
 - Anheuser-Busch, the world's third largest brewing company
 
Occupations and ranks
- Able Seaman (occupation), a civilian occupation
 - Able Seaman (rank), a naval rank
 - Airman Basic, the lowest rank in the United States Air Force
 
Organizations
- Afrikaner Broederbond, a South African secret society from 1918 to 1994
 - Aryan Brotherhood, an American gang
 
Places
- Anzab-e Olya, also called Ab, a village in Iran
 - AB postcode area, UK, including Aberdeen, Scotland
 - Atlantic Beach, FL, also called AB, a city in the United States
 - Albania (WMO country code)
 - Alberta (Canadian Province/Territory Code)
 - Air Base, used by the United States Air Force for overseas bases
 - Aschaffenburg, Germany (on vehicle registration plates)
 
Science, technology and mathematics
Medicine
- AB blood, a blood type in the ABO blood group system
 - AB toxin, Type III toxin secreted by some pathogenic bacteria
 - Antibody, a medical abbreviation
 - Abs, common name for the rectus abdominis muscle, a paired stomach muscle
 
Other uses in science, technology, and mathematics
- AB (star catalogue), Azzopardi / Breysacher catalogue of Wolf Rayet stars in the Small Magellanic Cloud
 - Aggregate base
 - Albite, a feldspar mineral
 - Ammonia borane, a chemical compound
 - Alabamine, a former name of Astatine
 - AB Class amplifier, a classification of electric amplifier
 - The category of abelian groups (Ab), in mathematics
 - NZR Ab class a New Zealand steam locomotive
 - Antibonding (a.b.), used to describe the character of orbitals in atomic and molecular electronic structure
 - ApacheBench, a command line tool for Apache HTTP Server
 - Armed boarding steamer, used by the United Kingdom during World War I, for boarding enemy vessels
 - A US Navy hull classification symbol: Crane ship (AB)
 
In religion
- Ab (Egyptian heart-soul concept), a concept of the heart-soul in ancient Egyptian religion
 - Ab., a Hebrew abbreviation related to Pirkei Avot, a compilation of teachings and maxims from the Mishnaic period
 - Aitareya Brahmana, an ancient Indian collection of sacred hymns
 
In sport
Association football
- Akademisk Boldklub, a Danish professional football club
 - Argja Bóltfelag, a Faroese association football club
 
Rugby union
- All Blacks, New Zealand's national rugby union team
 - Aviron Bayonnais, French rugby union club
 
Other
- AB de Villiers, South African middle order batsman and wicket-keeper
 - Adrien Broner, American Boxer, nicknamed AB
 - Allan Border, Australian cricketer, nicknamed A.B.
 - Antonio Brown, American football player, nicknamed AB
 - At Bat, in baseball statistics
 
Other uses
- Ab (cuneiform), a written syllable
 - Ab (given name), a short form of Albert (or occasionally Abraham or Abbott)
 - Ab (Semitic), a Semitic word for "father"
 - ab, a Welsh patronymic
 - Ap (water), Vedic Sanskti term for water, surviving as In Persian as Āb
 - AB, a South Australian dish made of hot potato chips, gyro meat and sauces, similar to a Halal snack pack
 - Abkhaz language (ISO 639-1 language code ab), a Northwest Caucasian language spoken mostly by the Abkhaz people
 - Adult baby, a person who practices paraphilic infantilism
 - Artium baccalaureus, Latin for Bachelor of Arts
 - Assembly Bill, a type of legislation in the United States
 - Absolute Beginner, a German rap group
 
See also
- A/B (disambiguation)
 - BA (disambiguation)
 - A-flat (disambiguation) ("A♭"), the musical note, scale, or key
 - Av, a month in the Hebrew calendar
 - Aβ, Beta amyloid, peptides of amino acids that are involved in Alzheimer's disease
 
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