MMO
# MMO

MMO may refer to:

## Entertainment

* Massively multiplayer online game, a video game that can be played by many people simultaneously
* Music Minus One, a record company in Westchester, New York

## Science and technology

* Methane monooxygenase, an enzyme
* Maximum operating Mach number
* 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 elctrodes

## Other

* 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
