| MDO | Machine Direction Orientation 
| Others |
| MDO | Machinegun Day Optic
| Others |
| MDO | Manager Defined Order
| Others |
| MDO | Managing Director's Office
| Others |
| MDO | Manufacturing Data Object
| Others |
| MDO | Maori Day Off
| Others |
| MDO | Marine Diesel Oil
| Others |
| MDO | Market Delivery Options
| Others |
| MDO | Market Development Organization
| Others |
| MDO | Marketing Development Officer
| Others |
| MDO | Maryland Online Network
| Others |
| MDO | Master Data Online
| Others |
| MDO | Maximum Degree of Order
| Others |
| MDO | Mechanism Dynamics Option
| Others |
| MDO | Media Organization
| Others |
| MDO | Medical Defence Organisation
| Others |
| MDO | Medical Defense Officer
| Others |
| MDO | Medium Density Overlaid
| Others |
| MDO | Medium Density Overlay
| Others |
| MDO | Mentally Disordered Offender
| Others |
| MDO | Mentally Disordered Offenders
| Others |
| MDO | Mercury Database Objects
| Others |
| MDO | Message Definition Object
| Others |
| MDO | Messy Dirty Office
| Others |
| MDO | Miami Dade Online
| Others |
| MDO | Microsoft Development Object
| Others |
| MDO | Microsomes and Drug Oxidations
| Others |
| MDO | Middleton Island Airport, Middleton Island, Alaska USA
| Others |
| MDO | Minimum Distribution Option
| Others |
| MDO | Mining Developing Owning
| Others |
| MDO | Mixed Domain Oscilloscopes
| Others |
| MDO | Modification and Delivery Order
| Others |
| MDO | Modified Density Overlay
| Others |
| MDO | Morningside Day Out
| Others |
| MDO | Mothers Day Out
| Others |
| MDO | Multi Domain Operations
| Others |
| MDO | Multidisciplinary Design Optimization
| Others |
| MDO | My Doctor Online
| Others |