MMO, or massively multiplayer online game, is a video game that can be played by many people simultaneously.

MMO or mmo may also refer to:

Entertainment

  • Music Minus One, a record company in Westchester, New York

Science and technology

  • Methane monooxygenase, an enzyme
  • Maximum operating Mach number, denoted M<sub>MO</sub>
  • Mercury Magnetospheric Orbiter, a component of the Mercury mapper BepiColombo
  • Mini-Mag Orion, a proposed type of spacecraft propulsion
  • Mixed metal oxide, a class of materials often used in electrodes

Other uses

  • Means, motive, and opportunity, the "indicators of suspicion"
  • Minimum municipal obligation, minimum contribution to a pension plan
  • Maio Airport, in Cape Verde, IATA code
  • Melton Mowbray railway station, England (National Rail station code MMO)
  • Marine Management Organisation, UK government body
  • Marine mammal observer, a professional in environmental consulting
  • Mangga Buang language, an ISO 639-3 code

See also

  • Military Merit Order (disambiguation)