BA or variants may refer to:

• Bachelor of Arts, an academic degree

• The New York Stock Exchange abbreviation for Boeing
• Bibliotheca Alexandrina, a library and cultural center in Egypt
• Booksellers Association of the UK and Ireland
• British Academy
• British Airways, a British airline
• British Association for the Advancement of Science, now British Science Association
• Bundesagentur für Arbeit, Federal Employment Agency of Germany
• Selskap med begrenset ansvar, a type of Norwegian company with limited liability
• Brewers Association, trade group in the United States

• Aka-Bo language, an Indian language, also known as Ba
• Bashkir language, ISO 639-1 language code ba
• Ba (cuneiform), a sign in cuneiform texts
• Ba (Indic), in Indic abugidas
• Ba (Javanese) (ꦧ), in the Javanese script
• Ba (Mongolic), in alphabets used to write Mongolic and Tungusic languages
• Arabic letter ب, named باء bāʾ

• Ba (given name), in Myanmar and ancient China
• Ba (surname), a West African surname
• Ba (pharaoh), an early Egyptian or ancient Egyptian king

• Buenos Aires, Argentina
• The Bahamas, WMO country code

• Ba (state), an ancient state in eastern Sichuan, China
• Ba River (China)
• Ba River (Vietnam)
• Bandra railway station, Indian Railways code BA
• Ba'a, Rote, Indonesia
• Bahrain, obsolete NATO, FIPS and LOC MARC country code
• Banan District, Chongqing, China, formerly Ba County
• Bazhou, Hebei, China, formerly Ba County

• BA postcode area, Bath, England
• Ba (Ljig), Serbia
  • Ba Congress, 1944
• Bosnia and Herzegovina, ISO-3166 country code BA
  • .ba, the top-level domain for Bosnia and Herzegovina

• Ba Province, Fiji
  • Ba (town)
  • Ba District, Fiji
  • Ba River (Fiji)
• Ba (Open Constituency, Fiji)

• Ba (genus), land snails
• ba space, in mathematics
• Barium, chemical symbol Ba
• Barye, a measurement unit of pressure
• 6-Benzylaminopurine, plant hormone
• BA, sublineages of the SARS-CoV-2 Omicron variant
• British Association screw threads, a set of small screw threads

• Ba F.C., a Fijian football club
• Ba game, a version of medieval football played in Scotland
• Basketball Australia, promoting basketball in Australia
• Batting average, a statistic in cricket and baseball
• Bowls Australia, a governing body
• Kirkwall Ba Game, or The Ba', annual event in Orkney, Scotland

• Ford Falcon (BA), an Australian car
• NZR B^A class, a New Zealand steam locomotive classification

• BA, dominical letter for a leap year starting on Saturday
• Ba (soul), an Ancient Egyptian concept of the soul or spirit
• Ba. (band), a Lithuanian rock band
• "B.A." Baracus, a fictional character in TV series The A-Team
• Beerenauslese, or BA, a German late-harvest wine
• Business agent (labor), a position in some local trade unions
• Business analyst, one who processes, interprets and documents business processes

• Ba River (disambiguation)
• BAA (disambiguation)
• Bah humbug (disambiguation)
• Loch Bà (disambiguation)
• Ya ba, drug containing methamphetamine and caffeine
• Boston and Albany Railroad, reporting mark B&A