MJ may refer to:
Fictional characters M.J. Delfino, in Desperate Housewives Mary Jane Watson, in Marvel comics Mary Jane Watson (2002 film series character), the film adaptation of the character MJ (Marvel Cinematic Universe), a character in the Marvel Cinematic Universe
Agent MJ, in the film Miss Cast Away and the Island Girls, played by Michael Jackson
Agent M, in the film Men in Black II, played by Michael Jackson
People
MJ (South Korean singer) (Kim Myung-jun, born 1994), South Korean singer, actor, and model MJ Acosta-Ruiz (fl. from 2016), Dominican-American sports reporter MJ Cole (born 1973), English DJ and record producer MJ Delaney, British television director MJ Erb (born 1994), American long-distance runner MJ Hegar (born 1976), American U.S. Air Force veteran and former political candidate MJ Hibbett (born 1970), English guitarist singer-songwriter Mary Jean "MJ" Lastimosa (born 1987), Filipina actress and beauty pageant titleholder MJ Lee (born 1987), American political correspondent MJ Lenderman (born 1999), American musician MJ Long (1939–2018), American architect, lecturer and author MJ Mentz (born 1982), South African rugby player MJ Pelser (born 1998), South African rugby player Mj Rodriguez (born 1991), American actress and singer Mary Joy "MJ" Tabal (born 1989), Filipina marathon runner M. J. Walker (born 1998), American basketball player in the Israeli Basketball Premier League and NBA MJ Williams (born 1995), Welsh footballer Mahan Mj (born 1968), Indian mathematician and monk Michael Jackson (1958–2009), American singer, songwriter, and dancer MJ the Musical, a 2021 Broadway musical centered on Michael Jackson MJ (album), the cast album to the musical Michael Jordan (born 1963), American businessman and former professional basketball player Mike Johnson (born 1972), Speaker of the United States House of Representatives since 2023
Science Megajoule (MJ), or millijoule (mJ), units of energy Jupiter mass (MJ), a unit of mass
Transportation Manufacturers' Junction Railway, near Cicero, Illinois, U.S., reporting mark MJ Líneas Aéreas Privadas Argentinas, a former Argentinian airline, IATA airline code MJ Jeep Comanche, designated MJ, a pickup truck MJ (New York City Subway service), a defunct subway service in New York City, US Maja railway station (station code), Lebak Regency, Banten, Indonesia Marwar Junction railway station (station code: MJ), Rajasthan, India
Other uses
The MJ, a short name for The Municipal Journal, a United Kingdom publication about local democracy and civic administration Maillot jaune or yellow jersey, worn by the leader of the Tour de France cycling stage race Master of Jurisprudence, a master's degree West's Military Justice Reporter (cited as M.J.), official reporter of the U.S. Court of Appeals for the Armed Forces Short for Mary Jane, slang for marijuana
See also
Emjay (born 1974), a Canadian Eurodance musician Ɱ, the letter M with hook