CMJ (disambiguation)

CMJ was a music events/online media company which hosted an annual festival in New York City

CMJ may also refer to:
 * Central Motorway Junction, motorway interchange in Auckland, New Zealand
 * Christopher Martin-Jenkins (1945–2013), English cricket journalist and broadcaster
 * Church's Ministry Among Jewish People, an Anglican church organisation
 * CMJ University, Chandra Mohan Jha University, India
 * College Mathematics Journal, a journal of the Mathematical Association of America
 * Computer Music Journal, quarterly academic journal covering digital audio signal processing and electroacoustic music
 * The Cormac McCarthy Journal, an academic journal dedicated to the works of American author Cormac McCarthy
 * Qimei Airport (IATA airport code), Cimei, Penghu, Taiwan
 * CMJ ammo, full metal jacket ammunition with cupronickel jacket