| MMO | Chamber of Mining Engineers of Turkey 
| Others |
| MMO | Mach Max Operating
| Others |
| MMO | Maintenance, Modifications and Operations
| Others |
| MMO | Maio, Cape Verde Islands
| Others |
| MMO | Make Money Online
| Others |
| MMO | Making Millions Online
| Others |
| MMO | Marine Management Organisation
| Others |
| MMO | Marine Management Organization
| Others |
| MMO | Marvel Mystery Oil
| Others |
| MMO | Mass Multiplayer Online
| Others |
| MMO | Massime Multiplayer Online
| Others |
| MMO | Massive Multi Online
| Others |
| MMO | Massive Multiplayer Online
| Others |
| MMO | Massively Multiplayer Online
| Others |
| MMO | Materials and Manufacturing Ontario
| Others |
| MMO | Materials Management Office
| Others |
| MMO | Medical Mutual of Ohio
| Others |
| MMO | Medieval Multiplayer Origin
| Others |
| MMO | MegaMan Original Series
| Others |
| MMO | Memo writer file (RapidFile)
| Others |
| MMO | Memory Map Overlay
| Others |
| MMO | Mercury Magnetosphere Orbiter
| Others |
| MMO | Mercury Magnetospheric Orbiter
| Others |
| MMO | Mercy Medical Operations
| Others |
| MMO | MetaMap Machine Output
| Others |
| MMO | Mighty Mopars of Orlando
| Others |
| MMO | Minimum MU Optimization
| Others |
| MMO | Minimum Municipal Obligation
| Others |
| MMO | Missouri Missions Offering
| Others |
| MMO | Mixed Metal Oxide
| Others |
| MMO | Mixed Metal Oxides
| Others |
| MMO | Mobile Module
| Others |
| MMO | Modem Managed Object
| Others |
| MMO | Money Makin Operations
| Others |
| MMO | Monster Man or
| Others |
| MMO | Monthly Market Outlook
| Others |
| MMO | Multi Media Object
| Others |
| MMO | Multi Media Online
| Others |
| MMO | Multi Msomething Online
| Others |
| MMO | Multi-Model Optimization
| Others |
| MMO | Multigrade Motor Oil
| Others |
| MMO | Music Minus One
| Others |
| MMO | The Macao Mathematics Olympics
| Others |