MTJ

MTJ may refer to:


 * Maulana Tariq Jamil
 * Magnetic tunnel junction
 * Montrose Regional Airport (airport code MTJ)
 * Mesivtha Tifereth Jerusalem, a yeshiva
 * Fukio Mitsuji, video game designer (nickname)
 * Married to Jonas, a reality show starring Kevin Jonas and his wife Danielle Deleasa
 * Mendocino Triple Junction, a plate tectonic feature
 * Martin Truex Jr., American professional stock car racing driver
 * Agencja Artystyczna MTJ (MTJ Artistic Agency), a Polish record label