JJ
JJ or jj may refer to:
Arts and entertainment
Film and television
- J. J. Evans, a character in the 1970s sitcom Good Times
 - Jennifer Jareau or JJ, a character in Criminal Minds
 - John Diggle Jr., a character in Arrow nicknamed "J.J."
 - JJ DiMeo, a character in Speechless
 - Jean-Jacques Leroy, a character in Yuri on Ice
 - JJ Jones (Skins), a character in the British teen drama Skins
 - "JJ" (Skins series 3), an episode of Skins series 3
 - "JJ", an episode of Skins series 4
 - JJ, the production code for the 1967 Doctor Who serial The Macra Terror
 
Music
- JJ (Swedish band)
 - JJ, a band featuring English singer Jan Johnston
 - J.J.!, an album by J. J. Johnson
 - "J.J.", a song on the soundtrack of the video game L.A. Noire
 - Abbreviation for Latin Jesu Juva, used by Johann Sebastian Bach at the beginning of his compositions
 
Other media
- JJ (magazine), a fashion magazine
 - JJ (video game), a video game developed and published by Square Co., Ltd.
 
People
- JJ (singer) (born 2001), Austrian singer-songwriter and winner of Eurovision 2025, Johannes Pietsch
 - JJ Lin (born 1981), Singaporean artist
 - J. J. Eubanks (born 1968), American basketball player
 - JJ Galbreath (born 2001), American football player
 - JJ Kaplan (born 1997), American-Israeli basketball player
 - JJ Lehto (born Jyrki Juhani Järvilehto, 1966), Finnish motor racing driver
 - J. J. McCarthy (born 2003), American football player
 - JJ Pegues (born 2001), American football player
 - J.J. Roberts (American football) (born 2001), American football player
 - J. J. Valberg (born 1936), British-American philosopher
 - J. J. Webster (1898–1965), American politician
 
Other uses
- Jj coupling, a form of angular momentum coupling
 - JJ, a brassiere measurement in the UK
 - LATAM Brasil, formerly TAM Airlines (IATA code JJ)
 - J/Z (New York City Subway service), formerly JJ
 - JJ, abbreviation for plural judges, justices
 - JJ, rapid trains on the Jōban Line in Japan
 - Jilly Juice, a fermented drink and a form of alternative medicine
 - John Jay Hall, a dormitory at Columbia University
 
See also
- Jay Jay the Jet Plane, a children's television cartoon series
 - Jay Jay, a 2003 Tamil film
 - Jay-J (born 1969), American house music disc jockey
 - Double J (disambiguation)
 - J & J (disambiguation)
 - JJS (disambiguation)
 - GG (disambiguation)
 - JJJ (disambiguation)