Ja or JA may refer to:
Arts and entertainment
Ja (novel), or Yes, by Thomas Bernhard JA (TV series), a Danish television show
Biology Ja (beetle), an insect genus Jasmonic acid, a plant hormone
Language Ja, grammatical particle meaning "yes" in most Germanic languages, Slovene language and informal English Ja, meaning "I" in many Slavic languages Ya (Cyrillic) (Я), 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
Organizations
Jamiat Ahle Hadith, a Pakistani political party Japan Agricultural Cooperatives (also JA Group) Junior Achievement, a US-based youth organization Yugoslav Action (Serbo-Croatian: Jugoslovenska akcija), a Yugoslav nationalist organization (1930–1935)
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
Transportation Chrysler JA platform, a series of vehicles made by Chrysler NZR JA Class, a 4-8-2 steam locomotive used by New Zealand Railways British Rail Class 73/0 electro-diesel locomotives (Pre-TOPS classification JA) Saikyō Line, whose official symbol is B&H Airlines (IATA:JA), a Bosnian airline
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) Japan (aircraft registration prefix JA)
See also YA (disambiguation)