J, or j, is the tenth letter of the English alphabet.
J may also refer to:
Alphabet characters J, Cyrillic letter Je , the voiced palatal approximant in the International Phonetic Alphabet ʲ, the symbol for palatalization in the IPA
Arts and entertaiment Fictional characters Agent J, in the Men in Black films J, a Bobobo-bo Bo-bobo character Serial Designation "J", in 2021–2024 web series Murder Drones J, the narrator of Jerome K. Jerome's novel Three Men in a Boat
Film and television Canal J, a French children's television channel J, the production code for the 1964 Doctor Who serial Planet of Giants
Literature J (novel), by Howard Jacobson, 2014 "J", a 1963 short story by Kenzaburō Ōe J. The Jewish News of Northern California, an American newspaper
Music
J Records, a record label J (Jaehyun album), 2024 "J", a song by Reggie and the Full Effect from the 2008 album Last Stop: Crappy Town "J", a song by Mindless Self Indulgence from the 2000 album Frankenstein Girls Will Seem Strangely Sexy
People J (musician) (Jun Onose, born 1970), Japanese rock musician J (South Korean singer) (Chung Jae-young, born 1977) J, pen name of Cornelia von Levetzow (1836–1921), Danish novelist J, a member of the K-pop group STAYC J., stage name of American White Zombie guitarist Jay Yuenger (fl. from 1982) J., stage name of German musician Jaye Muller (born 1967) J., a pseudonym of Jezper Söderlund (born 1980), Swedish record producer and electronic music artist J Dilla (James Dewitt Yancey, 1974–2006), American rapper J Mascis (Joseph Donald Mascis Jr, born 1965), American singer and guitarist of Dinosaur Jr. J Mays (born 1954), American industrial designer
Science and technology Astronomy J, a provisional designation in astronomy for objects discovered between May 1 and 15 of a year
Computing J (programming language) J# programming language for the Microsoft .NET Framework J operator, a programming construct J (operating system), for ICL's System 4 series of computers
Genetics and medicine Haplogroup J (mtDNA) Haplogroup J (Y-DNA) ATC code J Antiinfectives for systemic use, a section of the Anatomical Therapeutic Chemical Classification System
Mathematics , symbol used to denote the Bessel function or , symbol for the imaginary unit () , a hyperbolic unit in a split-complex numbers , a basis vector of a quaternion , an index variable in a matrix j-invariant, a modular function , symbol for second moment of area for an axis perpendicular to the plane
Physics and chemistry J, symbol for Joule, the SI unit of energy , the dimension symbol for luminous intensity , symbol for current density J/psi meson, a subatomic particle J-coupling, indirect dipole-dipole coupling between two nuclear spins J, for Jod, chemical element iodine in German and early periodic tables J band (disambiguation), several uses
Transportation Rail J (Los Angeles Railway), in the United States J Line (Los Angeles Metro), in the United States J/Z (New York City Subway service), in the United States J Church, an urban rail transit line of the Muni Metro system in San Francisco, California, United States NZR J class (disambiguation), two classes of steam locomotive in New Zealand Line J on the Transilien Paris-Saint-Lazare in France , the Bantan Line in Asago City, Hyōgo Prefecture, Japan "The J", the Elgin, Joliet and Eastern Railway, in Indiana, United States
Road Saviem J, and Renault J, a range of medium-duty trucks Guy Big J, a 1964–1978 range of trucks by Guy Motors of England Lamborghini Aventador J, a 2012 soecial edition sports car
Other uses J, slang for joint (cannabis) J, slang for a jump shot in basketball 1,3-Benzodioxolylbutanamine, or J, a psychedelic drug J, the international vehicle registration code for Japan J, the Postal code in Canada for the western and northern Quebec J, German Euro coin mint mark for Hamburg Jahwist (J), a widely recognized source of the Pentateuch J, abbreviated title of a High Court judge in England and Wales J, or Juliet, sometimes used a military time zone for local time
See also Jay (disambiguation) Jay Jay (disambiguation) Jay-Z (Shawn Corey Carter, born 1969), American rapper JJJ (disambiguation) J/22, J/24 and J/80 sailboat classes Kamen Rider J, a Japanese movie "J" Is for Judgment, a 1993 Sue Grafton "Alphabet mystery" series novel