MJA or mja can refer to:
Medical Journal of Australia, an Australian peer-reviewed medical journal Midtjyllands Avis, a local newspaper from Silkeborg, Denmark Medical Journalists' Association, an association of medical journalists in the United Kingdom Manja Airport, an airport in Manja, Madagascar, by IATA code Meja Road, a train station in India; see List of railway stations in India ISO 639:mja (or "Mahei"), a spurious language whose ISO 639 code was retired in 2010