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MMJ is a three-letter abbreviation which may represent:

  • Medical Marijuana or Medicinal Marijuana
  • the IATA airport code of Matsumoto Airport in Matsumoto, Nagano Prefecture, Japan
  • Moscow Mathematical Journal, a quarterly international academic journal published by the Independent University of Moscow
  • the ISO 639-3 identifier code for the Majhwar language
  • Modified Modular Jack, a six-pin modular connector used by Digital Equipment Corporation on their computers and peripherals.
  • My Morning Jacket, an alternative rock band from Kentucky
  • Multi-Media Journalist