| Acronym | Definition |
|---|
| MMO | Massively Multiplayer Online (gaming) |
| MMO | Mystic Moods Orchestra |
| MMO | Make Money Online (Internet marketing) |
| MMO | Music Minus One |
| MMO | Multi Media Object |
| MMO | Massively Multiplayer Online |
| MMO | Mobile Module |
| MMO | Marvel Mystery Oil (Turtle Wax, Inc.) |
| MMO | Mercury Magnetospheric Orbiter |
| MMO | Mixed Metal Oxide |
| MMO | Makine Muhendisler Odasi (Turkish: Chamber of Mechanical Engineers) |
| MMO | Multimodal Optimization |
| MMO | Materials and Manufacturing Ontario |
| MMO | Minimum Municipal Obligation (municipal pension funds) |
| MMO | Milwaukee Mandolin Orchestra (Milwaukee, WI) |
| MMO | Maximum Operating Mach Number |
| MMO | Marketing Mix Optimization |
| MMO | Multimedia Object |
| MMO | Means, Motive and Opportunity |
| MMO | Maintenance Management Officer |
| MMO | Mach Max Operating (aviation) |
| MMO | Man-Made Object |
| MMO | Multiple Male Orgasm |
| MMO | Multimedia Outlet |
| MMO | Miscellaneous Material Order |
| MMO | Modifications, Maintenance and Operations |
| MMO | Marine Mammals Observers |
| MMO | Main Mechanical Outfitting |
| MMO | Mars Mining Operations (Dark Orbit game) |
| MMO | Marching Men of Ohio |
| MMO | Motorcycle Museum Online |
| MMO | Modem Managed Object |
| MMO | Minor Maintenance Order |
| MMO | Mission Operation Management Organization |
| MMO | Maintenance Material Officer |
| MMO | Maximum Magnitude of the OCC (Odd Crosscorrelation) |
| MMO | Magnetic Method of Orientation (directional drilling compass type) |
| MMO | Mixed Mode Optimal (voting algorithm) |
| MMO | Mobility Movement Order |
| MMO | MIPR Management Office |
| MMO | Maintenance Manual Organization Level (TMINS) |
| MMO | Maden Mühendisleri Odasý |