| Acronym | Definition |
|---|
| MAO | Move as One |
| MAO | Main Astronomical Observatory (Ukraine) |
| MAO | Med Andra Ord |
| MAO | Miss America Organization |
| MAO | Medicare Advantage Organization (insurance) |
| MAO | Mid-Atlantic Ocean |
| MAO | Mono Amine Oxidase |
| MAO | Medical Administrative Officer |
| MAO | Mid America Oireachtas (Irish dance) |
| MAO | Maximum Allowable Offer (real estate) |
| MAO | Methyl Aluminoxane |
| MAO | Manaus, Amazonas, Brazil - Eduardo Gomes (Airport Code) |
| MAO | My Arrogant Opinion |
| MAO | Maximum Allowable Outage |
| MAO | Middelbaar Agrarisch Onderwijs |
| MAO | Major Attack Option |
| MAO | Mailing Address Only |
| MAO | Modified Audit Opinion |
| MAO | Maneuver Affairs Officer |
| MAO | Motivation Ability Opportunity (consumer behavior) |
| MAO | Multiple Acronym Overload |
| MAO | Managerial Accounting Office |