JA

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), a Bosnian airline
 * Yugoslav Action (Serbo-Croatian: Jugoslovenska akcija), a Yugoslav nationalist organization active between 1930 and 1935

Linguistics

 * 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

People

 * Ja (footballer) (born 1987), Cape Verdean footballer
 * Ja Morant (born 1999), American basketball player
 * JA One (born 1969), American graffiti artist
 * Ja Rule (born 1976), American rapper, singer, songwriter, and actor

Science and technology

 * Ja (beetle), a genus of beetles in the family Carabidae
 * Chrysler JA platform, a series of vehicles made by Chrysler
 * Jasmonic acid, a plant hormone

Transportation

 * British Rail Class 73/0 electro-diesel locomotives (Pre-TOPS classification JA)
 * NZR JA Class, a 4-8-2 steam locomotive used by New Zealand Railways
 * , the official symbol for the Saikyō Line in Japan

Other uses

 * Ja (unit), a unit of measurement of length in Korea
 * Japan (NATO country code)
 * Judge Advocate
 * Judge of Appeal
 * Jammu and Kashmir (union territory), India (postal code)