| Acronym | Definition |
|---|
| MWO | Mech Warrior Online (gaming) |
| MWO | MechWarrior Online (gaming) |
| MWO | Mount Washington Observatory (New Hampshire) |
| MWO | Model World Object |
| MWO | Microwave Oven |
| MWO | Master Warrant Officer |
| MWO | Modification Work Order |
| MWO | Multi Wave Oscillator |
| MWO | Miss World |
| MWO | Meteorological Watch Office (aviation) |
| MWO | Maritime Warfare Officer (Australia) |
| MWO | Militaire Willems Orde |
| MWO | Maintenance Work Order |
| MWO | Military Welfare Office |
| MWO | Moshing World Order (music promotional service in Toledo, Ohio) |
| MWO | Mystic World Online (gaming) |
| MWO | Material Work Order |
| MWO | Missile Warning Officer |
| MWO | Maganic Wars Online (multiplayer role-playing game) |
| MWO | Movement Warning Order (US DoD) |
| MWO | Minimum Work Obligation |
| MWO | Multiple Weighted Objective |
| MWO | Metal Working Oil |
| MWO | Mediterranean Wetlands Observatory (collaborative development project) |