JA, Ja, jA, or ja may refer to:

Arts and entertainment

  • Ja (novel), original German title of the novel Yes, by Thomas Bernhard
  • JA (TV series), a Danish television show

    Businesses and organizations

  • Jamiat Ahle Hadith a political party in Pakistan
  • Japan Agricultural Cooperatives, in Japan
  • Junior Achievement, a non-profit youth organization founded in 1919
  • B&H Airlines (IATA airline designator JA)
  • Yugoslav Action (Serbo-Croatian: Jugoslovenska akcija), a Yugoslav nationalist organization active between 1930 and 1935


  • Ja, grammatical particle meaning "yes" in most Germanic languages (including informal English)
  • Ja, meaning "I" in many Slavic languages
  • Я (Ya), a Cyrillic letter, pronounced /ja/ in some languages
  • Japanese language (ISO 639-1 alpha-2 code JA)
  • Ja (Indic), a glyph in the Brahmic family of scripts
  • Ja (Javanese) (ꦗ), a letter in the Javanese script

    Science and technology

  • Ja (genus), a genus of beetles in the family Carabidae
  • Chrysler JA platform, a platform of vehicles made by Chrysler
  • Jasmonic acid, a plant hormone
  • British Rail Class 73/0 electro-diesel locomotives (Pre-TOPS classification JA)

    Other uses

  • Ja (unit), a unit of measurement of length in Korea
  • Japan (NATO country code)
  • Judge Advocate
  • Judge of Appeal

    People with the given name Ja

  • Ja Morant (born 1999), American basketball player
  • Ja Rule (born 1976), American rapper, singer, songwriter, and actor