MJB

MJB may refer to:


 * Mary J. Blige (born 1971), American singer
 * Matthew James Bellamy, a lead guitarist and singer of rock band Muse, composer and songwriter
 * MJB (coffee), an American brand of coffee
 * Movement for Justice en el Barrio, a community organization in New York
 * Mejit Airport, a Marshall Islands airport with IATA code MJB
 * Magic Blue Airlines, a former Dutch airline with ICAO code MJB
 * MjB (mjbgem.com), MAGIC JEWELRY BRILLIANCE - famous international jewellery brand