EMJ may refer to:
Emergency Medicine Journal, a peer-reviewed medical journal EMJ, ICAO code for Yellow Air Taxi, an American airline EMJ, a brand name owned by Reliance Steel & Aluminum Co. EMJ, a category of Missing persons in the United States National Crime Information Center "EMJ (Emotional Musical Journey)", a bonus track on the 2011 album Welcome to Strangeland by Tech N9ne EMJ Data Systems, a company started by Canadian entrepreneur Jim Estill EMJ, Early Middle Japanese, spoken between 794 and 1185