JMJ

JMJ may refer to:


 * An abbreviation for the Holy Family (consisting of Jesus, Mary, and Joseph), printed by Christians on the top of letters and other places
 * IATA code for Lancang Jingmai Airport
 * Jam Master Jay (1965–2002), American musician and rapper
 * Jam Master Jay Records, an American record label
 * Jean-Michel Jarre (born 1948), French composer and producer
 * Justin Meldal-Johnsen (born 1970), American musician
 * World Youth Day (French: Journées Mondiales de la Jeunesse, Spanish Jornada Mundial de la Juventud, Portuguese: Jornada Mundial da Juventude)