ABA may refer to:

• ABA Games, a Japanese creator of freeware games.
• Australian British Alliance (ABA), Organization for the return of Australia to the United Kingdom
• ABA transit number, routing number issued by the American Banking Association.
• Aktiebolaget Aerotransport, one of the four Scandinavian airlines merged in 1946/8 to produce the airline Scandinavian Airlines System (SAS).
• Abakan Airport, Russia (IATA code).
• Aberdare railway station, United Kingdom (National Rail Code).
• Abscisic Acid, a plant hormone.
• Alameda Ballet Academy, a ballet school in Alameda, California, USA.
• Amateur Boxing Association (of England)
• American Bankers Association
• American Baptist Association
• American Bar Association
• American Basketball Association, 1967–76.
• American Basketball Association (21st century)
• American Birding Association
• American Board of Audiology
• American Booksellers Association
• Applied Behavior Analysis
• Asahi Broadcasting Aomori
• Australian Basketball Association
• Australian Broadcasting Authority
• American Bear Alliance
• Ternary form in music.
• A.B.A, a character in the fighting game series Guilty Gear

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