MMJ may refer to:
- Medical marijuana, cannabis prescribed by physicians for their patients
- MMJ (band), Filipino singing duo
- Modified Modular Jack, a six-pin modular connector used by Digital Equipment Corporation on their computers and peripherals.
- Moscow Mathematical Journal, a quarterly international academic journal published by the Independent University of Moscow
- Multimedia journalism
- My Morning Jacket, an American rock band
- The IATA airport code of Matsumoto Airport in Matsumoto, Nagano Prefecture, Japan
- The ISO 639-3 identifier code for the Majhwar language
This disambiguation page lists articles associated with the title MMJ.
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