BA, Ba, or ba may refer to:

Businesses and organizations

* Bangladesh Army * Bibliotheca Alexandrina, an Egyptian library and cultural center * Boeing (NYSE stock symbol BA) * Booksellers Association of the UK and Ireland * Boston Acoustics, an audio equipment manufacturer * Boston and Albany Railroad (reporting mark BA) * British Aircraft Manufacturing * British Airways (IATA airline code BA) * British-American Oil, a Canadian petroleum company * British Association for the Advancement of Science * The Nottingham Bluecoat Academy, a Church of England secondary school in Nottingham, England * Selskap med begrenset ansvar, a type of Norwegian company with limited liability * Bundesagentur für Arbeit, Federal Employment Agency of Germany

Languages

* Bashkir language (ISO 639 alpha-2 language code BA) * Ba (Javanese) (ꦧ), a letter in the Javanese script * Baa language, a Niger-Congo language * Aka-Bo language, an Indian language, also known as ''Ba'' * Arabic letter ب, named '

Names

* Ba (given name) * Ba (surname), common West African surname

Places

The Americas

* The Bahamas (WMO country code BA) * State of Bahia, Brazil (ISO 3166-2:BR code) * Barber County, Kansas, United States (state county code) * Buenos Aires, Argentina

Asia

* Ba (state), a Chinese vassal state during the Zhou Dynasty (1045–256 BCE) * Ba, a village in Tha Tum, Surin Province, Thailand * Ba River (China) * Bahrain (FIPS 10-4 country code) * Bandra railway station (railway code) * Tongde County ("Ba" in Tibetan), Hainan Tibetan Autonomous Prefecture, China

Europe

* BA postcode area, UK, the Bath postcode area in south west England * Ba (Ljig), village in Serbia * Bad Aussee, Austria (vehicle registration code BA) * Bamberg, Germany (vehicle registration code BA) * Province of Bari, Italy (ISO 3166-2:IT code and vehicle registration code BA) * Berane, Montenegro (vehicle registration code BA) * Bosnia and Herzegovina's ISO 2-letter country code ** .ba, the top-level domain for Bosnia and Herzegovina * Bratislava, Slovakia

Fiji

* Ba (town), a town in Fiji * Ba (Open Constituency, Fiji) * Ba District, Fiji, an administrative district in Fiji * Ba Province, Fiji * Ba River (Fiji)

Science

* Barium, symbol Ba, a chemical element * Barye, a measurement unit of pressure * Benzylamine, an organic chemical compound * 6-Benzylaminopurine, plant hormone * Blood alcohol content, Blood Alcohol content * β amyloid, peptides of several amino acids that are involved in Alzheimer's disease * ''Ba'', a genus of land snails in the family Charopidae, with one species ''Ba humbugi'' * Brodmann area, region of cerebral cortex defined based on its cytoarchitectonics * BA, designation for sublineages of the SARS-CoV-2 Omicron variant

Sport

* Ba F.C. * Ba game, a version of medieval football played in Scotland * Basketball Australia * Batting average, a statistic in cricket and baseball * Bowls Australia

Technology

* Badass (bridges), a guitar bridge trade name of Leo Quan * Balanced armature, a type of Headphones#Balanced armature, headphone technology * Breathing apparatus (disambiguation), equipment which allows a person to breathe in a hostile environment * British Association screw threads, a largely obsolete standard for small screw threads * Buoyancy aid, a personal flotation device * Ford BA Falcon, an Australian car * NZR Ba class, NZR B^A class, a steam locomotive classification used by the New Zealand Railways Department

Other uses

* BA, dominical letter for a leap year starting on Saturday * Ancient Egyptian conception of the soul#Ba (personality), Ba or bꜣ, "personality", an Ancient Egyptian conception of the soul, Ancient Egyptian concept of the soul or spirit * Ba, white dove used for religious sacrifices in Mandaeism * Ba (pharaoh), or Horus Ba, a very early pharaoh who might have reigned in the First Dynasty of Egypt * B. A. Baracus, a fictional character on the television series ''The A-Team'' * Bachelor of Arts, an academic degree * Beerenauslese, a German late-harvest wine * Business agent (labor), a position in some local trade unions * Business analyst * Business architecture * Ya ba, tablets containing a mixture of methamphetamine and caffeine