Look up MMO in Wiktionary, the free dictionary.

The abbreviation MMO can stand for any of several things:

• Marine Mammal Observer
• Massively multiplayer online game
• Means, motive, and opportunity
• Melton Mowbray railway station, England; National Rail station code MMO.
• Methane monooxygenase
• Minimum Municipal Obligation (municipal pension funds)
• Mixed metal oxide electrodes
• Maximum Mach number (Mmo), a limit shown on a Machmeter

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.