MMO
MMO may refer to:
Organizations
- Marine Management Organisation, a non-departmental public body of the UK Government
- Music Minus One, a music industry company
Science, technology, and biology
- Marine Mammal Observer, a professional in environmental consulting
- Methane monooxygenase, an enzyme
- Mixed metal oxide, a type of electrode
- Matyas-Meyer-Oseas (cryptography), a construction to build a hash function from a block cipher
- Mach Maximum Operating (MMO), a speed limit shown on a machmeter
- Mercury Magnetospheric Orbiter, a key component of the ESA-led Mercury mapper BepiColombo
- Mini-Mag Orion, a proposed type of spacecraft propulsion
Other uses
- Massively multiplayer online game, a multiplayer video game which is capable of supporting hundreds or thousands of players simultaneously
- Means, motive, and opportunity, three aspects of a crime (U.S.)
- Melton Mowbray railway station, National Rail station code MMO (England)
- Minimum Municipal Obligation, minimum contribution to a pension plan